Abstract
The paper presents study results obtained for the bottom sediment samples of fjords Kongsfjord, Isfjord, Hornsund in the form of surface samples and their core profiles. The concentrations of labile form of aluminum and heavy metals were determined using the single-stage extraction with 3 mol L−1 HCl. The obtained results allowed defining the occurrence of variability of labile aluminum form in the samples of bottom sediments of the studied fjords depending on the point and depth of sample collection. The conducted chemometric analysis allowed for the study of spatial variability of aluminum occurrence in the area of the investigated fjords. Based on the analysis, the correlations between aluminum and heavy metals were determined.
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Introduction
Spitsbergen is Norway’s largest island located in the Svalbard Archipelago on the Arctic Sea. Over half of the area of Spitsbergen is covered by glaciers, the rest of the island is made up of mountains and seaside lowlands. The permanent snow borderline is from 200 m above sea level in the south-east to 800 m above sea level in the north of Western Spitsbergen. Most glaciers are of the mountainous nature and flow into the sea. Most of the archipelago’s area, especially Western Spitsbergen, is formed of massive mountains. The mountains in the central part of Spitsbergen and those on the islands of Edge and Barents are made of flat slabs of sedimentary rocks; they have steep slopes and flat tops. Metamorphic and eruptive rocks form sharp, ragged peaks, which are typical for the north-western and south-western coast of Western Spitsbergen. The western and northern coasts of Western Spitsbergen are deeply penetrated by numerous fjords (narrow and deep sea bays) (Svedensen et al. 2002; Hop et al. 2002). Hornsund is the most southward fjord in Spitsbergen. It separates Sorkappland (the Southern Cape Land) in the east from Wedel Jarlsberg Land in the north. The length of the fjord is about 30 km, its average depth is about 90 m, and its maximum depth amounts to 260 m. The fjord runs along the east–west axis and it is perpendicular to the main regional faults of Spitsbergen. The area of the fjord and its shoreline are increasing continuously due to the diminishing glaciers. The fjord is surrounded by mountain ranges: Hornsundtind (1,431 m a.s.l.)—the highest mountain in southern Spitsbergen, situated on the southern side of the fjord. The seaside lowlands are covered with abundant tundra vegetation. The Hornsund region is located in the area of South Spitsbergen National Park (Sorspitsbergen Nasjonalpark), which comprises Wedel Jarlsberg Land, Torell Land and Sorkappland along with the adjacent territorial waters (Hop et al. 2002). Due to the abundant marine fauna and flora, as well as the lack of human-caused damage, Hornsund and Kongsfjord have been included in the list of 12 European Flagship Biodiversity Sites within the Framework EU Programme (Svedensen et al. 2002). In terms of morphology and hydrology, Hornsund is clearly divided into two basins: the outer basins (with good water exchange with the area of the shelf) and the inner one (separated by moraine thresholds with restricted contact with the shelf water). The outer part is marked by summer temperatures higher than the temperatures in the inner part by 2–3 °C. Surface salinity is higher in the outer part, while the bottom salinity is higher in the inner part, which is the effect of the deposition of post-winter, dense and very cold bottom water (Węsławski et al. 2006). Kongsfjord is one of the most famous fjords of Northern and Central Spitsbergen. It constitutes a separate natural land of Svalbard. KongsfjorKongsfjord is located in the western part of Spitsbergen. It is an open fjord, the shelf–fjord exchange significantly influences the physical and biological changes in this fjord system. Kongsfjord represents the borderline between the biogeographical zones: the Atlantic zone and the Arctic zone. The fjord is 20 km long and from 4 to 10 km wide. The terrains situated in the close vicinity of Kongsfjord have been shaped by the activity of the glaciers. Isfjord is one of the 35 known fjords of Western Spitsbergen. It has the area of 7,309 km2 (100 × 25 km) and its maximum depth amounts to 425 m. The shores of Isfjord consist to a large extent of low mountain slopes. The average temperature of the western part of Spitsbergen amounts to −6 °C and the average atmospheric precipitation 140–440 mm. Based on the lithostratographic studies by Levitan et al. (2008), the surface layer of sediments collected from the fjord is made of fine-grained fractions <0.063 mm (brownish silt) with the addition of sand. In the study period, the content of total organic matter of the sediments amounted to 1.8 % (Levitan et al. 2008).
Aluminum belongs to four most common elements occurring in soil. It is one of the most important components of soils and, to the same extent as silicon, it makes the crystal framework of soil minerals. Due to its high reactivity (standard redox potential for Al3+ E o = −1.662 V), it almost exclusively occurs in soils in chemically bounded state, most often as Al3+ ion in sparingly soluble crystal lattices. Aluminum may also be present as a ligand in combination with organic substance, in form of complex bounds with fulvic and humic acids included in the soil organic substance. Moreover, aluminum can create mineral and organic complexes of different hydration levels (Gardner and Comber 2003). It should be underlined that, in complex environmental matrices such as soil solutions, inorganic and organic ligands compete with OH− for the formation of Al complexes which can be labile. To the labile aluminum include the following forms: exchangeable, water-soluble, total organically bound, acid extractable/soluble, weakly organically bound Al and also amorphous inorganic Al (Walna et al. 2005). The uses of chemical extraction can define the aluminum fractions which can be related to a potentially mobile and reactive pool of aluminum in a sample. Considering Hlavy et al. (2004), the mobile fraction is defined as the sum of the amount dissolved in the liquid phase and an amount that can be transferred into the liquid phase. Besides, generally the ecological effects of metals (for example, their bioavailability) are related to such mobile fractions rather than the total concentration (Hlavy et al. 2004). Moreover, the concentration of bioavailable metals is important, because it is this fraction that is likely to be toxic and the cause of any impact to biota. Bioavailable metals including aluminum can be natural in origin or anthropogenic, and they normally reside in the chemically reactive or labile fraction of the sediment. Depending on the physico-chemical character of the analyzed sediment, the bioavailable fraction could be adsorbed to sediments’ particles such as organic matter, Fe–Mn oxides, carbonates or amorphous sulfides (Frankowski et al. 2010). The uses of hydrochloric acid which has the reducing properties help liberate metals from Fe and Mn oxides. It is also efficient at decomposing labile organic phases and amorphous sulfides present in sediment (Snape et al. 2004).
The aims of the study were to determine the labile forms of aluminum in fjord samples using a single-stage extraction as well as to term the degree of aluminum extraction with hydrochloric acid, to examine the variability of the concentration of the labile aluminum in fjord samples depending on the location and depth of sampling and to define the co-existence of aluminum with other elements, including heavy metals by chemometric methods.
Materials and methods
The samples were collected at the turn of July and August 2010 from three fjords (Kongsfjord, Isfjord, Hornsund) located in the island of Spitsbergen (Fig. 1).
The samples were collected using a box corer. For the purpose of the study, the samples were collected from the surface layer and, in the case of fjords Hornsund and Kongsfjord, also in the form of several-centimeter deep profiles collected every 1 cm. The detailed description of the points of sample collection has been presented in Figs. 2, 3, 4, and the data have been listed in Table 1.
Sample preparation
After the transportation, the collected fjord samples were stored in a freezer in the temperature of −20 °C. The samples were then freeze-dried, homogenized using an agate mortar and sieved through a 63-μm sieve. The samples were then subjected to the single-stage extraction in accordance with the procedures presented in papers (Zioła-Frankowska et al. 2009; Szczuciński et al. 2007; Frankowski et al. 2009). 1.5 g of sediment samples was prepared and placed in 50 mL glass flasks. Then, 10 mL of 3 mol L−1 HCl (Merck, Germany) acid was added to each flask. The samples were next heated in the water bath for 1 h in the temperature of about 95 °C. To limit the evaporation of the extracting solution, a Vigreux column was placed at the cone flask’s outlet. The samples were then let to cool down and filtrated into 15 mL polypropylene Falcon test tubes. The labile fraction of heavy metals and aluminum were determined in extracts by F-AAS analytical technique. The determination of aluminum and heavy metals was performed in 3 replications, and the % RSD did not exceed 5 %. Heavy metals and aluminum were determined using the Shimadzu AA7000 spectrometer (Shimadzu, Japan).
Results and discussion
The evaluation of aluminum extraction degree based on the analysis of reference material SRM 2709
To check the analytical procedure of the determination of labile aluminum form, the determination of reference material NIST SRM 2709 (National Institute of Standards and Technology, USA) was performed. The certified value for the reference material SRM 2709 was determined by F-AAS technique. According to the producer’s recommendations, mineralization was performed using the USEPA 3050b method recommended for SRM 2709. The reference material was analyzed during six repetitions by F-AAS technique. Moreover, [%] of the method recovery for the extraction by PN-ISO 11466 has been presented, as well as the extraction results of the method used in the study of fjords (3 mol L−1 HCl; Merck, Germany) (Zioła-Frankowska et al. 2009; Szczuciński et al. 2007; Frankowski et al. 2009). The calculated values of basic parameters of the described analytical methods are presented in Table 2.
Results of the determinations of labile aluminum form extracted with 3 mol L−1 HCl for the samples from fjords Isfjord, Kongsfjord and Hornsund
Isfjord
The samples of bottom sediments of ISFJORD were collected from seven points differentiated in terms of the place of sample collection and depth (55–254 m). The highest concentration of labile aluminum form was determined for sample ISMAR 6 (9,992 mg kg−1) collected at the depth of 200 m, while the lowest concentration was found for sample ISMAR 5 (5,797 mg kg−1) collected at 160 m. Samples ISMAR 6 and ISMAR 7, for which the highest aluminum concentrations were determined, are located in the closest vicinity to the land. Therefore, it may be assumed that higher concentrations of aluminum in this part of the fjord can be caused by the migration of elements to water as a result of the natural processes of weathering of the rocks surrounded by Isfjord. Samples ISMAR 1 and ISMAR 2 were located close to each other and were collected from the same depth 171 m. For these samples, the comparable concentrations of labile aluminum forms were determined, similar to samples ISMAR 3, ISMAR 4 and ISMAR 5, located in the central part of this fjord. Levitan et al. (2008), in the sedimentary studies of fjord Isfjord, determined the aluminum content using the X-ray fluorescence (XRF) technique and obtained the values at the level of 92 g kg−1 for the total content of aluminum in a sample (layer up to 25 cm). It must be explained that the XRF analysis allows for the total determination of % Al2O3 content in a sample. Based on Table 2, the recovery of 3 mol L−1 HCl procedure caused extraction about 25.3 ± 0.9 % of pseudo-total content of aluminum extracted by EPA method 3050. The determined concentration of labile aluminum form under this study maximally amounted to about 10 g kg−1 which is estimated about 39.5 g kg−1 of pseudo-total aluminum.
Moreover, fjord samples are characterized by high % participation of fine-grained fractions, that is <0.063 mm. Levitan et al. (2008) obtained the values ranging from 80 to 93 % (maximum value for the depth of 7–33 cm) of this fraction’s participation in the whole sediment mass. Such high participation of fraction <0.063 mm may be preferential for the studies of sediment chemistry as the high participation of this fraction is evidence of the high concentration in the whole sediment mass. The influence of granulation on the concentration of aluminum or heavy metals has been the subject of many studies (Frankowski et al. 2005; Kowalski et al. 2007; Frankowski et al. 2008; Sutherland 2003; Sutherland and Tack 2007). Even a minor participation of fine-grained fraction, where the highest concentrations of elements are observed, causes the increase in the participation in the whole sediment mass. Higher concentrations of aluminum or heavy metals in fine-grained fractions are connected with the large specific area of these fractions, which in consequence enlarges the sorption area on the grain surface. The effect of high participation of fine-grained fractions in fjord sediments is that the results obtained for these fractions may even constitute up to 80–93 % participation (based on the granulometric analysis by Levitan et al. 2008) in the whole sediment mass.
Hornsund
In the case of fjord Hornsund, the samples were collected as core profile samples from three points. The concentrations of labile aluminum form, determined in the samples of Hans 1, Hans 2, Hans 3 core profiles, depending on the profile length are shown in Fig. 5.
For sample Hans 1, the highest concentration of labile aluminum form was determined for the sample collected at the 8–9 cm of the core profile length (9,214 mg kg−1), while the lowest concentration was found for the sample collected at 10–11 cm of the core profile length (7,045 mg kg−1). For sample Hans 2, the highest concentration of the labile form of aluminum was determined for the sample collected at 9–10 cm of the core profile length (10,070 mg kg−1), while the lowest concentration was found for the sample collected at 1–2 cm of the core profile length (6,816 mg kg−1). For sample Hans 3, the highest concentration of the labile form of aluminum was determined for the sample collected at 9–10 cm of the core profile length (10,980 mg kg−1), while the lowest concentration was found for the sample collected at 10–11 cm of the core profile length (6,424 mg kg−1). When analyzing the concentration results obtained for labile aluminum form along with the core profile length of the samples collected from fjord Hornsund, it can be stated that the concentration variability of labile aluminum form occurs, and that this relation is common for all the core profiles. Considering the fact that the samples from this fjord were collected at small distances from one another, from the land into the sea: Hans 1–2–3 from the depths 54–24–25 (m), no significant differences were stated in the results obtained for the 0–1 cm core profile sample. The variability common for all the analyzed core profiles of the fjord is most probably the result of the processes of sedimentation and migration of aluminum along the profile, which can be observed in Fig. 5. The highest aluminum concentrations occurred between 9 and 10 cm of the profile, and then a rapid decrease in aluminum concentration took place. Similarly, at the profile heights of 3–5 cm, the aluminum concentration increased, and at 5–6 cm, a rapid decrease in aluminum concentration was observed.
Kongsfjord
The samples of fjord Kongsfjord were collected from the surface layer from 27 places at the depths of 27–327 m. The 15, 11 and 13 cm long core profiles were collected at three points for KON 2, KON 11 and KON 15. The highest concentrations of labile aluminum form for fjord Kongsfjord were determined for sample KON 31 (12,340 mg kg−1) collected at the depth of 49 m. The high concentrations of labile aluminum form were also determined for samples: KON 10, KON 8, KON 24 (>10,000 mg kg−1). In the case of the group of samples from fjord Kongsfjord, the attempt to evaluate the variability concerns the place of sample collection and the inflow from land into the water–bottom sediment system, as well as the depth of fjord samples collection from the surface layer. To determine the above-mentioned factors, the maps of the depth of sample collection (Fig. 6a) and the aluminum concentrations at these points (Fig. 6b) were made.
Based on Fig. 6a and b, it can be stated that the highest concentrations of labile aluminum form determined in samples KON 31, KON 10 occur in the north-eastern part of the fjord, marked by the largest depths. A similar conclusion can be drawn for samples KON 24 and KON 27. In the northern part of the fjord, the concentration of labile aluminum form was higher (KON 8, KON 10, KON 16, KON 24, KON 27, KON 31) than in the south-eastern and southern belt (KON 1, KON 2, KON 3, KON 4, KON 5, KON 6, KON 11, KON 12, KON 13, KON 28). It can be related to the occurrence of natural aluminum sources in the form of sedimentary, metamorphic and eruption rocks in this area.
Kongsfjord core profiles KON 2, KON 11, KON 15
Three profile samples were collected in the area of fjord Kongsfjord. The variability of the concentration of aluminum in core profile is presented in Fig. 7.
The highest concentration of labile aluminum form in core profile KON 2 was determined for the sample collected at the depth of 5–6 cm of the profile length (6,545 mg kg−1), while the lowest concentration was found for the sample collected at 11–12 cm of the profile length (4,747 mg kg−1). For the core profile collected from point KON 11 (11 cm profile), the highest concentration of labile aluminum form was determined for the sample collected at the depth of 5–6 cm of the profile length (7,430 mg kg−1), while the lowest concentration was found for the sample collected at 0–1 cm of the profile length (5,704 mg kg−1). In the case of sample KON 15 (profile length 13 cm), the highest concentration of labile aluminum form was determined for the sample collected at the depth of 1–2 cm of the profile length (8,657 mg kg−1), while the lowest concentration was found for the sample collected at 12–13 cm of the profile length (5,204 mg kg−1). Based on the variability evaluation, it may be confirmed that aluminum concentration is higher in the northern belt in comparison with the southern one. Moreover, this trend remained for a longer time, which confirms the natural processes of elements migration to bottom sediments. The observed trend of the distribution of labile aluminum form may be linked to the process of sedimentation of suspended solids and other natural processes described in the case of fjords Isfjord and Hornsund.
Total content of aluminum in fjords samples
The results of total content of aluminum after mineralization with hydrofluoric acid are presented in Table 3. The percentage of labile aluminum form was calculated as the ratio of the concentration of labile Al form to total content of aluminum in the fjords samples. The percentage obtained for labile Al form was similar for samples of Kongsfjord (around 30 %); for Isfjord, the percentage was divided into two groups: around 16 % and around 35 %. For core samples of Hansfjord and Kongsfjord, the content of aluminum was higher for Hansfjords cores that that for Kongsfjord cores. We compare the percentage of the labile fraction of aluminum values and found it was higher for Kongsfjord than for Hansfjord.
Heavy metals and aluminum
The conducted single-stage extraction with 3 mol L−1 HCl allowed determining labile form of aluminum and heavy metals in fjords samples from Spitsbergen. The results obtained for heavy metals and Al have been presented in the table as min–max values for particular surface samples of the fjords (Isfjord, Kongsfjord) and as min–max values for the profiles of fjords Kongsfjord and Hornsund (Table 4).
It is worth emphasizing that investigations conducted for the area of Spitsbergen have been the subject of many studies, but mostly the data concerning microbiology and sedimentology can be found (Walkusz et al. 2004; Elverhøi et al. 1980; Elverhøi et al. 1983; Zajączkowski and Legeżyńska 2001; Szczuciński et al. 2009). While the chemical analysis of determination of total and pseudo total concentrations of aluminium and heavy metals form Spitsbergen fjords was rarely conducted.
Gulińska et al. (2003) determined the pseudo-total content of Al (34.56–277.25 mg kg−1), Pb (0.14–9.33 mg kg−1), Zn (0.49–12.77 mg kg−1), Fe (29.38–389.8 mg kg−1), Mn (2.12–78.07 mg kg−1) in soil samples collected from the central part of Spitsbergen using the procedure with HNO3 (V) and H2O2 (30 %). However, in comparison with the results obtained for fjord samples (Table 3, this work), the pseudo-total concentration of Al and Pb, Zn, Fe and Mn in soil samples of the central Spitsbergen is characterized by significantly lower content, despite the fact that in the case of research by Gulińska et al. (2003) a much stronger extractants were used. It may be stated that the concentrations of the presented elements in soils are characterized by the geochemical background, and the soils in this area are subject to continuous processes of weathering and migration, e.g. to the water depth, from where they can be sedimented to the bottom sediments of the analyzed fjords.
Heavy metals (Cd, Cu and Pb) in sediment from Adventfjord and Grønfjord located in the Isfjord system, Svalbard, after microwave digestion with a combination of HF and aqua regia were determined by Holte et al. (1996). The concentrations of heavy metals in the surface sediments of the Adventfjord and Grønfjord were 0.08–0.12 mg kg−1 for Cd, 27.1–30.8 mg kg−1 for Cu and 19.5–26.0 mg kg−1 for Pb. In comparison, the concentration of heavy metals in fjords samples from Isfjord (this work) after extraction with 3 M HCl was 0.302–0.954 mg kg−1 for Cd, 13.3–18.7 mg kg−1 for Cu and 8.0–24.2 mg kg−1 for Pb. It is worth noting that the determined concentrations for samples Ismar, especially for Cu and Pb, are comparable with the results of the total content of these metals in sediments marked by Holte et al. (1996), despite the use of a much weaker extractant. It can be stated that metals are occluded on the surface of the grain (Frankowski et al. 2008).
Regarding the determination of the labile form of heavy metals in fjords sample from Spitsebergen area, there is a lack in the literature. Melke (2006) determined the form available to plants by extracting the soils of the Bellsund (Spitsbergen) with DTPA-TEA (diethylenetriaminepenta acetic acid) extractant. The contents of DTPA-TEA extractable Cu, Zn, Pb, Cd and Mn were as follows: 0.17–24.76, 0.18–45.28, 0.10–25.30, 0.02–1.30, and 0.56–371.09 mg kg−1, respectively. The concentrations of available metals by Melke (2006) are lower as against the concentrations of labile form of heavy metals in fjords samples. It was observed that in both analyzed type of samples, the high concentration of manganese was determined.
The extraction procedure by the dilute HCl, similar to this work, was applied by Snape et al. (2004) for the purpose of assessing the labile metal contaminants in Antarctic marine sediments. Snape et al. (2004) extracted sediments by 1 M HCl at different times (0.5 and 4 h). The determined concentration of labile form of heavy metals after 0.5 h time extraction was 0.02–0.11 mg kg−1 for Cd, 0.04–2.1 mg kg−1 for Cr, 0.2–14 mg kg−1 for Cu, 0.2–2 mg kg−1 for Ni, 0.1–45 mg kg−1 for Pb, 2.5–40 mg kg−1 for Zn, 2–4 mg kg−1 for Mn and 100–2,500 mg kg−1 for Fe. Comparing these results to the concentrations marked for the same metals in the fjords samples (Table 3, this work), it can be concluded that they are present at a similar level concentrations, particularly in the case of Pb, Zn and Cu.
Chemometric evaluation of the variability of aluminum occurrence in fjord samples Spatial variability: coexistence of aluminum and other elements
The analysis of principal components of the studied fjord samples was performed for the whole set of data comprising both surface samples and core profile samples collected for fjords Hornsund and Kongsfjord. The analysis of principal components was performed on a data set which was subjected to normalization following the transformations necessary for meeting the conditions of chemometric analysis. The transformations described by Mazerski (2004) were used. The variance for the first four components in the analyzed data set was, respectively, 45.14, 22.55, 11.06 and 6.40 (%) (summary value 85.20 %). The chemometric analysis of samples is presented in Fig. 8.
Based on the PCA, three groups of samples were distinguished, characteristic for particular studied fjords, both in terms of samples collected from the surface layer of bottom sediments and for the core profiles collected from particular fjords. It should be underlined that the area of Spitsbergen is not exposed to pollution due to human industrial activity. The main processes of bottom sediment formation include the sedimentation of suspended solids which get to water as a result of a number of physico-chemical processes. Moreover, the PCA indicated the division of particular fjords into differentiated systems, which at the same time are marked by certain individual characteristics. For the same data matrix, the analysis of principal components was performed for the studied elements (Fig. 9).
The chemometric analysis confirms the relationship between the occurrence of aluminum and iron, due to the similarity of these two elements and to the occurrence level of both iron and aluminum. In the surface water systems, Fe coexists mainly with Mn. The analysis of factor loads indirectly indicates the correlations between these elements. Factor loads (without rotation) presented in Table 5 confirm the strong correlation between Fe and Al, as well as between Cd, Ni and Zn (factor 1) and Mn (factor 2).
On the other hand, the factor loads distinguished with the normalized varimax rotation indicate strong correlation between Cd, Mn, Ni (factor 1) and Cr, Cu, Zn (factor 2).
The varimax rotation allows for the easier interpretation of results as the varimax looks for such a set of factor loads at which each factor has certain loads near 0 and certain loads near −1, +1. The interpretation of results is much easier when the correlations between the variable and the factor reach the values near −1, +1 (there is no correlation at the value near 0) (Table 6).
The results of factor loads and Al and Fe correlations could be expected, but the analysis with varimax rotation indicates Mn, Cd and Ni correlation. In such studies, the analysis of the results is difficult, mainly due to complicated processes of exchange and migration of elements between systems. Melke (2006) in the study of soils in Bellsund (Spitsbergen) observed a strong correlation between Cd and Mn for heavy metal fractions which define the concentration of elements as toxic for plants.
Conclusions
A single-stage extraction with 3 mol L−1 HCl allowed for the distinguishing of aluminum labile form in fjord samples (Isfjord, Kongsfjord, Hornsund). The studies of fjords revealed that aluminum concentration in particular fjords varies and depends on the local conditions and processes taking place in the system of a given fjord. The highest concentrations of labile aluminum form were determined in the samples located at the smallest distance from land for fjord Isfjord. On the other hand, for fjord Kongsfjord, the highest concentrations of the labile form of aluminum were determined in the samples from the north-eastern belt area. This belt was marked by high concentrations of the determined aluminum form in comparison with lower concentrations of this aluminum form in the central and southern belts. For the samples of fjord core profiles (KON 2, KON 11, KON 15), the decrease in labile aluminum form was stated along with the increasing length of the studied profiles. The lack of variability in the concentration of labile aluminum form along with the profile lengths from fjord Hornsund was found (Hans 1, Hans 2, Hans 3). Based on the analysis of fjord Isfjord and macroscopic analysis, it was revealed that high concentrations of aluminum, heavy metals may be caused by the high participation of fraction <0.063 mm. The chemometric analysis confirmed the relationship between the occurrence of aluminum and iron. Moreover, based on the PCA, a correlation between Cd and Mn concentrations was observed in the investigated samples of bottom sediments.
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Acknowledgments
The authors wish to thank Dr. Witold Szczucinski from Adam Mickiewicz Univeristy for fjords samples and valuable comments to the paper.
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Frankowski, M., Zioła-Frankowska, A. Analysis of labile form of aluminum and heavy metals in bottom sediments from Kongsfjord, Isfjord, Hornsund fjords. Environ Earth Sci 71, 1147–1158 (2014). https://doi.org/10.1007/s12665-013-2518-5
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DOI: https://doi.org/10.1007/s12665-013-2518-5