Status of groundwater arsenic contamination in the state of West Bengal, India: a 20-year study report.

Since 1988 we have analyzed 140 150 water samples from tube wells in all 19 districts of West Bengal for arsenic; 48.1% had arsenic above 10 microg/L (WHO guideline value), 23.8% above 50 microg/L (Indian Standard) and 3.3% above 300 microg/L (concentration predicting overt arsenical skin lesions). Based on arsenic concentrations we have classified West Bengal into three zones: highly affected (9 districts mainly in eastern side of Bhagirathi River), mildly affected (5 districts in northern part) and unaffected (5 districts in western part). The estimated number of tube wells in 8 of the highly affected districts is 1.3 million, and estimated population drinking arsenic contaminated water above 10 and 50 microg/L were 9.5 and 4.2 million, respectively. In West Bengal alone, 26 million people are potentially at risk from drinking arsenic-contaminated water (above 10 microg/L). Studying information for water from different depths from 107 253 tube wells, we noted that arsenic concentration decreased with increasing depth. Measured arsenic concentration in two tube wells in Kolkata for 325 and 51 days during 2002-2005, showed 15% oscillatory movement without any long-term trend. Regional variability is dependent on sub-surface geology. In the arsenic-affected flood plain of the river Ganga, the crisis is not having too little water to satisfy our needs, it is the crisis of managing the water.

[1]  G. Ozolins,et al.  WHO guidelines for drinking-water quality. , 1984, WHO chronicle.

[2]  S. Dey,et al.  Chronic arsenic poisoning from tube-well water. , 1984, Journal of the Indian Medical Association.

[3]  M. Ali,et al.  Arsenic Contamination of Groundwater in Bangladesh , 2006 .

[4]  Charles F. Harvey,et al.  Arsenic Mobility and Groundwater Extraction in Bangladesh , 2002, Science.

[5]  S. Lahiri,et al.  Arsenic poisoning in the Ganges delta , 1999, Nature.

[6]  D. G. Guha Mazumder Arsenic and non-malignant lung disease. , 2007, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[7]  T. Roychowdhury Influence of several factors during collection and preservation prior to analysis of arsenic in groundwater: A case study from West Bengal, India , 2008 .

[8]  M. Kumar,et al.  Current knowledge on the distribution of arsenic in groundwater in five states of India , 2007, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[9]  R. Ortega,et al.  The concentrations of arsenic and other toxic elements in Bangladesh's drinking water. , 2002, Environmental health perspectives.

[10]  K. Ahmed,et al.  Limited temporal variability of arsenic concentrations in 20 wells monitored for 3 years in Araihazar, Bangladesh. , 2005, Environmental science & technology.

[11]  Yajuan Xia,et al.  An overview on chronic arsenism via drinking water in PR China. , 2004, Toxicology.

[12]  A. K. Susheela Fluorosis management programme in India , 1999 .

[13]  R. Howarth,et al.  Comment on "limited temporal variability of arsenic concentrations in 20 wells monitored for 3 years in Araihazar, Bangladesh". , 2006, Environmental science & technology.

[14]  D. Chakraborti,et al.  Arsenic Groundwater Contamination and Sufferings of People in North 24-Parganas, One of the Nine Arsenic Affected Districts of West Bengal, India , 2003, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[15]  D. G. Guha Mazumder Arsenic exposure and health effects. , 2002, Journal of toxicology. Clinical toxicology.

[16]  R. Calderon,et al.  Arsenic : exposure and health effects , 1997 .

[17]  D. Chakraborti,et al.  Groundwater arsenic contamination and its health effects in the Ganga-Meghna-Brahmaputra plain. , 2004, Journal of environmental monitoring : JEM.

[18]  Amitava Mukherjee,et al.  Arsenic contamination in groundwater: a global perspective with emphasis on the Asian scenario. , 2006, Journal of health, population, and nutrition.

[19]  A. K. Chakraborti,et al.  Possible Arsenic Contamination Free Groundwater Source in Bangladesh , 1999 .

[20]  Mohammad Sohel Rahman,et al.  Effectiveness and reliability of arsenic field testing kits: are the million dollar screening projects effective or not? , 2002, Environmental science & technology.