A study was conducted to evaluate the quality of groundwater in Barishal district of Bangladesh for both irrigation and drinking purposes. Sixty water samples were collected and analyzed in the Biochemistry laboratory of Bangladesh Agricultural University for the assessment of their quality based on a number of parameters, namely - total dissolved solids (TDS), electrical conductivity (EC), sodium adsorption ratio (SAR), Kellys ratio (KR), residual sodium carbonate (RSC), soluble sodium percentage (SSP), pH and magnesium absorption ratio (MAR), salinity and alkalinity hazard, total cation and anion. Most of the water samples were found as acceptable in terms of TDS, EC, SAR and TH values, but unacceptable based on pH. Though the water samples were demonstrated as good and satisfactory water class in terms of SSP and KR, respectively, they were categorized as harmful water class in term of MAR. However, in terms of salinity and alkalinity hazard, most of the water samples were found as good water class for irrigation. In case of drinking purpose, most of the samples were found as permissible, good and safe based on EC, pH, and TDS, respectively. Though the samples were demonstrated as suitable and good water class in terms of TH and nitrate, respectively, they were classified as unsatisfactory based on sulphate. Overall for the groundwater samples, SSP-KR and pH-TH had a very strong correlation with a correlation coefficient around 1, and EC, TH and pH showed a negative correlation with most of the parameters. The study revealed that the quality of groundwater for most of the locations in the area was permissible and good for irrigation and drinking purposes.
Key words: Groundwater quality, irrigation, drinking water, quality parameters
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