Evaluation of groundwater quality and its suitability for drinking purpose in Rajshahi City, Bangladesh

Autor:	M. G. Mostafa, S. M. Helal Uddin, Alifa Bintha Haque
Rok vydání:	2011
Předmět:	inorganic chemicals chemistry.chemical_element chemistry.chemical_compound Pre monsoon chemistry Post monsoon Calcium bicarbonate Environmental chemistry Environmental science Water quality Neutral ph Groundwater quality Groundwater Arsenic Water Science and Technology
Zdroj:	Water Supply. 11:545-559
ISSN:	1607-0798 1606-9749
DOI:	10.2166/ws.2011.079
Popis:	A study was conducted to evaluate the hydrochemical processes controlling the water quality variations and to determine the water type of groundwater in Rajshahi City, Bangladesh, for drinking purposes. A total of 120 shallow and deep tubewell water samples were collected in pre- and post-monsoon seasons during the year 2008–2009 and analyzed for various physico-chemical parameters. The results of the analyses show that water samples were slightly alkaline to neutral pH. The average concentrations of Pb in all samples for the post-monsoon season were above the WHO's guideline for drinking water. For both seasons, arsenic levels exceeded the drinking water standard in 25% of groundwater samples and lead (Pb) levels exceeded in about 60% samples which contained elevated levels (>0.01 mg/L). The major cationic and anionic orders of dominance were unusual, being Ca2+ > Mg2+ > Na+ > K2 > Fe3+ > Pb2+ > Zn2+ > Cu2+ > As (total) > Cd2+ and HCO3− > Cl−> SO42− > NO3−, respectively. The study reveals that the water type of the groundwater was calcium bicarbonate (Ca-HCO3). Thus overall results suggest that groundwater quality of the study area was not suitable for drinking purposes without treatment especially for Pb and As.
Databáze:	OpenAIRE
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