Abstract
The main source of irrigation water in Bangladesh is groundwater, hence its quality needs to be ensured; otherwise, it can damage soil and reduce crop production. In current research, work by analyzing hydrogeochemical characteristics of groundwater different water types have been assessed to find out the suitable irrigation water of Godagari upazila in the western zone of Bangladesh. Studied parameters include pH, EC, TDS, K+, Na+, Ca2+, Mg2+, Fe2+, Cl−, Br−, NO3 − and SO4 2− along with sodium adsorption ratio (SAR), soluble sodium percentage (SSP), residual sodium bicarbonate (RSBC), permeability index (PI), magnesium adsorption ratio (MAR), Kelley’s ratio (KR), Mg:Ca and Na:Ca. XLSTAT and AquaChem software were used to perform factor analysis and determine water types of groundwater, respectively. The mean trends of cations and anions of the study area are Na+ > Ca2+ > Mg2+ > K+ > Fe2+ and Cl− > HCO3 − > SO4 2− > NO3 − where silicate-weathered minerals influence the groundwater quality of the study area. Except PI all parameters satisfy irrigation water standards. However, Na–Ca–Mg and Na–Ca–Cl types of water need to be under observation for any future changes since SSP is not satisfied for both of them and considering KR Na–Ca–Cl water type is not suited. Except these two groups, Ca–Na–Mg and Ca–Na–Mg–Cl water types are suitable for irrigation.
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Introduction
Agriculture was entirely dependent on surface water and monsoon rainfall in Bangladesh prior to the 1970s (UNDP 1982). After that to produce high-yielding rice varieties (MPO 1987) and to achieve success the international campaign of clean drinking water decade (1980–1990), millions of drinking and irrigation water wells have been installed in Bangladesh (WARPO 2000; BGS and DPHE 2001; World Bank 2005). Now groundwater is the main source of irrigation water of Bangladesh (Shirazi et al. 2010). By 2006, nearly 78 % of the irrigated rice-fields were supplied by groundwater of which about 80 % of the irrigation water derived from shallow tubewells and the rest was irrigated by deep tubewells (UNDP 1982; BBS 2009). Such irrigation water needs to be of appropriate quality. The chemical constituents of irrigation water can affect plant growth directly through toxicity or deficiency, or indirectly by altering plant availability of nutrients (Ayers and Westcot 1985; Rowe and Magid 1995). Bad irrigation water not only can affect crop production, but also soil fertility that influences soil physical condition (Al-Omran et al. 2010). Moreover, currently groundwater is the only limiting resource for further intensification of agriculture, therefore its rational use should be ensured in terms of quality and quantity (Sarkar and Hassan 2006). Thus, knowledge of irrigation water quality is critical to the understanding of necessary management changes for long-term productivity (Bauder et al. 2004).
Water quality analysis is an important issue in groundwater studies. Quality of groundwater is equally important to its quality owing to the suitability of water for various purposes (Subramani et al. 2005). Many researchers reveal the groundwater quality of different regions of Bangladesh for irrigation purpose: Quddus and Zaman (1996) studied the irrigation water quality of some selected villages of Meherpur district of Bangladesh, Mridha et al. (1996) explored groundwater at Natore district, Talukder et al. (1998) worked on groundwater of Kishoreganj district, Shahidullah et al. (2000) and Sultana et al. (2009) assessed the groundwater quality in Mymensigh district, Sarkar and Hassan (2006) investigated the groundwater of Pabna district. Raihan and Alam (2008) analyzed groundwater quality throughout the Sunamganj district, Islam and Shamsad (2009) assessed groundwater quality of Bogra district and Rahman et al. (2012) studied groundwater quality of Satkhira district for irrigation purpose.
Although several research works revealed groundwater quality for irrigation purpose in the western and northwestern districts (e.g., Natore, Pabna and Bogra), investigation in other districts is also needed. This is because it was reported that in the same geographic area, groundwater composition can be varied (Sood et al. 1998). Poor-quality irrigation water reduces soil productivity, changes soil physical and chemical properties, creates crop toxicity and ultimately reduces yield (Talukder et al. 1999). Therefore, to safeguard the long-term sustainability of the groundwater resources the quality of the water needs to be continuously monitored (Raihan and Alam 2008). However, if it is possible to identify which water type(s) is suitable for irrigation in a specific area then it will be more convenient and less time consuming to identify suitability of irrigation water. In view of this, an attempt has been made to analyze the groundwater quality of the western region of Bangladesh to determine the exact level of physico-chemical parameters with special emphasis on its irrigation suitability and find out best water type to be used as irrigation water in the study area.
Materials and methods
Study area and sampling
The study was conducted at Godagari upazila under Rajshahi district of western zone of Bangladesh. Fifteen deep groundwater samples (S1–S15) were collected from 15 randomly selected irrigation pump wells whose depths varied from 110 to 185 m (Fig. 1). Each well was pumped until steady pH and electrical conductivity were obtained. Samples were collected in 500-ml polyethylene bottles. The bottles were rinsed with distilled water before collecting the sample water. From each location, two sets of samples were collected. One was non-acidified and other was acidified with 0.01 molar hydrochloric acid. The geographical location of each pumping well was determined with a handheld global positioning system (GPS) (Explorist 200, Megellan). Water samples were labeled and then transferred immediately to the Bangladesh centre for scientific and industrial research (BCSIR) laboratories in Dhaka, Bangladesh for chemical analysis.
Measurement of physico-chemical parameters
The pH and EC were determined during sampling by using EcoScan Ion 6 and Hanna HI 8633 portable meters, respectively. Each portable meters were calibrated with standard solutions according to instrument manuals. Other parameters were measured in the Bangladesh centre for scientific and industrial research (BCSIR) laboratories. Total dissolved solids (TDS) were estimated by weighing the solid residue obtained by evaporation of a measured volume of water samples to dryness (Chopra and Kanwar 1980). Potassium (K+) and sodium (Na+) were determined by flame emission spectrophotometer (Model SHIMADZU, AA-6401F) (Golterman 1971). Calcium (Ca2+), magnesium (Mg2+) and iron (Fe2+) were analyzed directly by atomic absorption spectrophotometer and chloride (Cl−), bromide (Br−), nitrate (NO3 −) and sulfate (SO4 2−) of the groundwater samples were determined by ion chromatography according to standard methods (APHA 1998). Bicarbonate (HCO3 −) was determined by acidimetric titration (Chopra and Kanwar 1980). The types of water have been determined by using AquaChem (version 3.6) software.
Factor analysis (FA)
Multivariate statistical methods including factor analysis (FA) have been used successfully in hydrochemistry for many years (Praus 2005). FA enables to explain the relationships among numerous important variables with a smaller set of independent variables. There are three stages in FA: for all the variables a correlation matrix is generated, factors are extracted from the correlation matrix based on the correlation coefficients of the variables to maximize the relationship between some of the factors and variables, the factors are rotated (Gupta et al. 2005). The correlation matrix is used to account for the degree of mutually shared variability between individual pairs of water quality variables. Then, eigenvalues and factor loadings for the correlation matrix are determined. Eigenvalues correspond to the eigenfactor which identifies the groups of variables that are highly correlated among them. Lower eigenvalues may contribute little to the explanatory ability of the data. Only the first few factors are needed to account for much of the parameter variability. Once the correlation matrix and eigenvalues are obtained, factor loadings are used to measure the correlation between the variables and factors. Finally factor rotation is done to facilitate interpretation by providing a simpler factor structure (Zeng and Rasmussen 2005). For current research, XLSTAT (version 2013.6.03) had been used to perform the FA.
Irrigation water quality
Use of poor water quality can create four types of problems such as toxicity, water infiltration rate, salinity and miscellaneous (Ayers and Westcot 1985). To assess water quality for irrigation, there are four most popular criteria like TDS or EC, sodium adsorption ratio (SAR), chemical concentration of elements like Na+, Cl− and/or B− and residual sodium carbonate (RSC) (Michael 1992; Raghunath 1987). For current irrigation water quality assessment besides the individual chemical parameters, the following parameters have been considered.
According to Richards LA (US Salinity Laboratory) (1954), sodium adsorption ratio (SAR) is expressed as:
Todd (1980) defined soluble sodium percentage (SSP) or Na+ % as:
Gupta (1983) expressed residual sodium bicarbonate (RSBC) as:
Doneen (1964) defined permeability index (PI) as:
Magnesium adsorption ratio (MAR) (Raghunath 1987), also known as magnesium hazard (MH) was calculated as:
Lastly, Kelley’s ratio (KR) (Kelley 1963) described as:
All ionic concentrations are in milli equivalent per liter (meq/L). All these parameters and individual chemical parameters had been compared with national and international standards to assess the groundwater for suitability of irrigation.
Results and discussion
General characteristics of groundwater
General characteristics of groundwater in the study area are shown in Table 1. The pH of the groundwater is slightly acidic to alkaline. Piper diagram (Piper 1944) reveals that the most of the groundwater samples (about 67 %) do not contain any dominant cation (Fig. 2). However, in case of anions 60 % samples fall in chloride type considering hydrochemical facies according to Kehew (2001). The mean trends of cations and anions of the study area are Na+ > Ca2+ > Mg2+ > K+ > Fe2+ and Cl− > HCO3 − > SO4 2− > NO3 −, respectively. From the Pearson correlation matrices (Table 2) it is seen that EC and TDS, pH and HCO3 −, and Ca2+ and SO4 2− have strong positive correlation. Na+ and Cl−, Ca2+ and Mg2+, Ca2+ and NO3 −, Mg2+ and SO4 2−, and Mg2+ and NO3 − have moderate positive correlations with each other. This means that the paired parameters have strong to moderate influence with each other. Bogra district, situated northeast of the study area, shows similar condition considering EC and TDS values. Islam and Shamsad (2009) found EC and TDS in Bogra with mean values of 549.5 µS/cm and 335.70 mg/L where current study shows mean values of 563.07 µS/cm and 320.40 mg/L, respectively.
Hydrogeochemistry of groundwater
Geochemical properties and principles that govern the behavior of dissolved chemical constituents in groundwater are referred to as hydrogeochemistry. The variation on the concentration levels of the different hydrogeochemical constituents dissolved in water determines its usefulness for domestic, industrial and agricultural purposes (Obiefuna and Sheriff 2011). Gibbs’s diagrams are used to gain better insight into hydrochemical processes on groundwater chemistry in the study area (Sivasubramanian et al. 2013). Gibbs’s diagrams, representing the ratios of Na+:(Na+ + Ca2+) and Cl−:(Cl− + HCO3 −) as a function of TDS, are widely employed to assess the functional sources of dissolved chemical constituents, such as precipitation-dominance, rock-dominance and evaporation-dominance (Gibbs 1970). The chemical data of groundwater sample points of the study area are plotted in Gibbs’s diagrams as shown in Fig. 3. The distribution of sample points, as shown as cluster(s), suggests that the chemical weathering of rock-forming minerals are influencing the groundwater quality.
Factor analysis (FA)
The use of factor analysis to water quality assessment has increased, mainly due to the need to obtain appreciable data reduction for analysis and decision (Chapman 1992; Kucuksezgin 1996; Chiacchio et al. 1997; Vega et al. 1998; Morales et al. 1999; Helena et al. 2000). Kaiser proposed to use only the factors with eigenvalues exceeding one (Liu et al. 2003). FA has been applied to the standardized full dataset. According to the combination of criteria for factor selection eigenvalues higher than 1.0, four most significant factors have been taken. The factor loading is classified as “strong”, “moderate” and “weak” corresponding to absolute loading values of >0.75, 0.75–0.50, and <0.5, respectively (Unmesh et al. 2006). Dalton and Upschurch (1978) have shown that factor scores can be related to the intensity of the particular process described. Extreme negative values (close to −1) indicate areas essentially unaffected by the process and the positives scores (close to +1) are the areas of most affected.
Factor analysis shows that the first four factors accounted for 75.98 % of the total variance whose eigenvalues is more than 1 (Table 3). Factor 1 (F1) shows strong loading for EC and TDS, whereas others have weak loading. This may show combined contribution of other ions in the water. Factor 2 (F2) shows strong loading for Ca2+ and Mg2+ which may come from silicate weathering or carbonate dissolution and also can be said as lithologically controlled. SO4 2− shows strong loading only in F2 and NO3 − shows moderate loading for both F2 and factor 4 (F4). This may come from agricultural fertilizer indicating presence of significant anthropogenic activities in the study area. Factor 3 (F3) includes strong loading of pH and HCO3 − that indicate alkaline nature of the groundwater which is also seen in the Pearson correlation matrices (Table 2).
Source rock deduction
The cations and anions are mainly derived from rock weathering rather than evaporation, crystallysation and precipitation according to Fig. 3. A major proportion of these ions can be derived from the weathering of crystalline dolomitic limestones and calcicum–magnesium silicates, chiefly from calcite, gypsum and feldspars plagioclase (Wen et al. 2005). Both Ca2+ and Mg2+ may react with HCO3 − precipitating as calcite and dolomite. As Ca2+ and Mg2+ react with HCO3 − there would be straight positive correlation between Ca2+/HCO3 − and Mg2+/HCO3 − ratios (Zahid et al. 2008). Although current study shows good positive correlation between Ca2+/HCO3 − vs. Mg2+/HCO3 − (r 2 = 0.72), calcite and dolomite have difficulty in forming when TDS values are less than 600 mg/L (Zhang et al. 2007). Average TDS (320.40 mg/L) is much lower than the required value; therefore in the study area it may not possible to have calcite and dolomite dissolution. Moreover if Ca2+ and Mg2+ originate only from the dissolution of carbonates in the aquifer materials and from the weathering of accessory pyroxene or amphibole minerals, then the (Ca2+ + Mg2+)/HCO3 − ratio would be 0.5 (Sami 1992). However, Fig. 4a shows the ratio is very higher than 0.5 (or 1:2 line), i.e., above 2:1 line.
In Fig. 4b, the plot of (Ca2+ + Mg2+) vs. (HCO3 − + SO4 2−) shows that most of the data falls below the 1:1 line that reflects the requirement of cations from weathering of silicate rocks. The high ratio from Fig. 4a suggests that the excess of alkalinity of these water is balanced by alkalis, i.e., Na+ and K+. Moreover, the excess of alkaline earth elements (Ca2+ and Mg2+) reflects an extra source of Ca2+ and Mg2+ and is balanced by Cl− and SO4 2− (Wen et al. 2005). This statement is supported by Fig. 4c where (Ca2+ + Mg2+) vs. total cation shows that the data is below the 1:1 line, reflect an increasing contribution of Na+ and K+ as TDS increase as reported by Rahman et al. (2011).
The Na+ dominance, an index of weathering, suggests that the ions result from silicate weathering or dissolution of soil salts, whereas the excess of (Na+ + K+) over Cl− (Fig. 4d) in the water reflects silicate weathering (Stallard and Edmond 1983) and also suggests that the higher concentration of alkalis is from the sources other than precipitation (Singh and Hasnain 1999). Additionally, the molar ratio of Na+/Cl− >1 (Fig. 4e) indicates the source of Na+ is silicate weathering, particularly Na-plagioclase (Hounslow 1995). However, groundwater in the area have a higher ratio (average of 0.6) of (Na+ + K+) vs. total cations (Fig. 4f), depicting the contribution of cations via silicate weathering and soils, to some extent (Sarin et al. 1989; Datta and Tyagi 1996). This high ratio also shows that silicate minerals might come into the solution by the dissolution of plagioclase (albite) to kaolinite, montmorillonite and/or gibbsite according to Eqs. 7, 8 and 9, respectively (Rahman et al. 2011).
The Na-normalized (Gaillardet et al. 1999) ratios for Ca2+ and Mg2+ might have related to each other. Accordingly, in the plot of the molar ratios of Mg2+/Na+ vs. Ca2+/Na+ are shown in a log–log plot in Fig. 5a. Recharging water flowing through carbonate-rich aquifer shows high Ca2+/Na+ and Mg2+/Na+ ratios. The end member having lower Na-normalized ratio is that of water draining silicates (Rahman et al. 2011). The molar Ca2+/Na+ ratio of average crustal continental rocks is close to 0.6 (Taylor and McLennan 1985), and due to higher solubility of Na+ relative to Ca2+, lower Ca2+/Na+ molar ratio is expected in groundwater, which is related to weathering of silicates. In Fig. 5a, the observed groundwater with low Ca2+/Na+ molar ratio is being influenced by silicate weathering rather than carbonate dissolution. Similarly, in the plot for Ca2+/Na+ vs. HCO3 −/Na+molar ratios (Fig. 5b), low molar ratios of them is the indication of silicate weathering.
Four water types have been found in the study area and depending on these the sample water has been divided into four groups: group 1 (G1) includes S1, S4, S7, S8, S9 samples that represent Ca–Na–Mg type of water; group 2 (G2) consists of S3, S5, S6, S10 for Na–Ca–Mg; group 3 (G3) contains S12, S13, S14, S15 for Ca–Na-Mg–Cl and finally group 4 (G4) comprises S2, S11 for Na–Ca–Cl water. G1 shows maximum values of pH (7.3), EC (602.6 µS/cm), TDS (339 mg/L) and HCO3 − (7.26 mg/L) among all groups (Table 4). G3 presents highest values of Ca2+ (100.73 mg/L), Mg2+ (20.02 mg/L), SO4 2− (10.3 mg/L) and NO3 − (3.41 mg/L). Na+ and Cl− ions show exceptionally high concentration (117.12 and 237 mg/L, respectively), in G4 among all groups. Individually no parameters exceed the irrigation water standards set by national and international organizations (Table 4).
TDS is an important parameter to be considered as irrigation water quality, because many of the toxic solid materials may be imbedded in the water, which may cause harm to the plants (Matthess 1982). In the absence of non-ionic dissolved constituents, TDS and EC are indicative of saline water (Michael 1992). According to Robinove et al. (1958), all samples are non-saline (<1,000 mg/L) which is suitable for irrigation. Again in terms of ‘Degree of restrictions on use’, TDS values <450 mg/L represent the irrigation water as ‘none’ (UCCC 1974) which is met by the study area.
The sodium adsorption ratio (SAR) is generally considered an effective evaluation index for most water used in irrigated agriculture (Ayers and Westcot 1985). There is a significant relationship between SAR values of irrigation water and the extent to which Na+ is absorbed by the soil (Raihan and Alam 2008). If water used for irrigation is high in Na+ and low in Ca2+, the cation change complex may become saturated with Na+. This can destroy the soil structure owing to dispersion of the clay particles (Todd 1980). Presence of Na+ in irrigation water reacts with soil to reduce permeability and its repeated uses makes the soil impermeable, while high Na+ leads to development of alkali soil. High Na+ saturation also directly causes Ca2+ deficiency. Frequent irrigation with high Na+ water for a considerable duration makes the soil plastic and sticky in wet condition and form clods and crust on drying condition. In contrast, presence of Ca2+ or Mg2+ salts in irrigation water retards the evil effect of sodium by increasing the permeability of the soils (Punmia and Lal 1981; Asaduzzaman 1985). In the study area, highest SAR value is 3.42 found for G4 where concentration of Na+ (117.12 mg/L) is also highest among all groups and the values are within standard limits with excellent suitability for irrigation (Tables 4 and 6). Irrigation water can also be classified according to the US salinity laboratory’s diagram (Richards LA (US Salinity Laboratory) 1954) where SAR is an index of sodium hazard and EC is an index of salinity hazard (Fig. 6). In this diagram all sample water shows low sodium hazard and except about 13 % sample, the rest shows medium salinity hazard. Again, considering soluble sodium percentage (SSP) values suitability varies from Good (G1 and G3) to Fair (G2 and G4) according to Wilcox (1955) (Tables 5 and 6). More elaborately, Wilcox’s diagram (Wilcox 1948) reveals that only two samples from G2 and G4 are Fair and other samples are classified as Good (Fig. 7). Such high SSP in irrigation water may stunt the plant growth and reduces soil permeability (Joshi et al. 2009).
Fe2+ contents of water samples were found within the safe limit for irrigation where the recommended limit of Fe2+ is 5.0 mg/L (Ayers and Westcot 1985). Total hardness (TH) of the study area varies from 214.46 to 333.63 mg/L of CaCO3 (Table 5). According to Sawyer and McCarty (1967), G3 water group belongs to very hard water (>300 mg/L of CaCO3) class and other groups are classified as hard water (150–300 mg/L of CaCO3). Gupta (1983) suggested that residual sodium carbonate (RSC) should be calculated simply as residual sodium bicarbonate (RSBC). The water containing RSBC < 5, 5–10 and >10 meq/L should be tentatively considered as safe, marginal and unsatisfactory, respectively (Gupta and Gupta 1987). Therefore, RSBC of the study area meets irrigation water quality where all RSBC values are <5 meq/L. RSBC indicates the excess concentration of HCO3 − over Ca2+ (Hussain and Hussain 2004). The negative values (Table 5) of all water groups of the study area reveal excess HCO3 − in water. However, considering permeability index (PI) groundwater of the study area does not satisfy for irrigation. According to Donen’s chart PI should be less than 1 (Raghunath 1987) where the lowest PI value of the study area is 39.2 for G1 (Table 5).
Kelley’s ratio (KR) indicates balance among Na+, Ca2+ and Mg2+ ions in water. KR of more than 1 indicates an excess level of Na+ in water. Kelley (1963) suggested that the ratio for irrigation water should not exceed 1. Only G4 water exceeds such standard (Table 5). Magnesium adsorption ratio (MAR) causes harmful effect to soil when it exceeds 50 (Gupta and Gupta 1987). Highest MAR observed in the study area is 30.39 for G2 that ensures no such effect to soil. Moreover, at the same level of salinity and SAR, adsorption of Na+ by soil and clay minerals is more at higher Mg:Ca ratio. Because the bonding energy of Mg2+ is less than that of Ca2+ that allows more Na+ adsorption and it happens when the ratio exceeds 4 (Michael 1992). Richards LA (US Salinity Laboratory) (1954) named this ratio as magnesium hazard (MH). Additionally, soil containing high levels of exchangeable Mg2+ causes infiltration problem (Ayers and Westcot 1985). The study area have low Mg:Ca ratios than 4 (Table 5) that shows no threat of infiltration problem for soil from the groundwater. Similar to Mg:Ca ratio, Na:Ca ratio also indicates possible threat to infiltration problem arising from used irrigation water. Presence of excessive Na+ in irrigation water promotes soil dispersion and structural break down when Na:Ca ratio exceeds 3. Infiltration problem will occur from such high ratio primarily due to lack of sufficient Ca2+ to counter the dispersing effect of Na+. Excessive Na+ also create problems in crop water uptake, poor seedling emergence, lack of aeration, plant and root diseases, etc. (Ayers and Westcot 1985). Present study area has Na:Ca ratio less than 3 (Table 5) which demonstrates that there is no possibility of infiltration problem occurring in the groundwater. Considering pH, EC, SAR and TH the groundwater of the study area is suitable for irrigation as found in Pabna district (Sarkar and Hassan 2006) and Bogra district (Islam and Shamsad 2009) which are situated at the southeast and northeast of the study area, respectively. Although in these studies KR and SSP are found to be suitable for irrigation, current research does not reveal suitability for all water types.
Conclusion
Although the mean trend of cations of the study area is Na+ > Ca2+ > Mg2+ > K+ > Fe2+, most of the groundwater samples do not contain any dominant cation. Again anions’ mean trend is Cl− > HCO3 − > SO4 2− > NO3 − and 60 % samples fall in chloride type considering hydrochemical facies. The groundwater quality in the study area is influenced by silicate-weathered minerals. Except PI all individual chemical parameters and pH, EC, TDS, RSBC, MAR, Mg:Ca and Na:Ca of the groundwater are satisfied as the irrigation water. Among four water types, Na–Ca–Cl type of water does not satisfy SSP and KR criteria and Na–Ca–Mg does not satisfy SSP. Therefore, these two water types are required to be monitored for future chemical status change. Other two groups, i.e., Ca–Na–Mg and Ca–Na–Mg–Cl water types are suitable to be used for irrigation.
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Tanvir Rahman, M.A.T.M., Saadat, A.H.M., Islam, M.S. et al. Groundwater characterization and selection of suitable water type for irrigation in the western region of Bangladesh. Appl Water Sci 7, 233–243 (2017). https://doi.org/10.1007/s13201-014-0239-x
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DOI: https://doi.org/10.1007/s13201-014-0239-x