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Extra info for Arsenic Contamination of Groundwater: Mechanism, Analysis, and Remediation
6 million hectares is covered via 23,000 DTWs. 27 million hectares for other crops (FAO, 2006). , 1999). The most severely contaminated districts lie in the north-central, southeastern, and southwestern regions of the country, where up to 90% of the wells tested are contaminated (Figure 1). In general, the southern half of the country is more contaminated than the northern half. In terms of the concentration of arsenic in water, there are very wide variations. However, there is general pattern to this variation: It is wide in the northwest and southwest, whereas it is uniform in the southeast.
Low-price reliable test kits are needed that can address this issue. There is a need to identify reliable ﬁlters that can be scaled up for larger communities. In this way, both maintenance and reliability issues can be addressed. The education and training of local scientists and technicians need to be encouraged so that the local people can address these problems themselves. There is a need for more analytical scientists, instrumentation, and testing laboratories. Consumers of contaminated water need to be better educated so they do not continue to drink contaminated water because of their reluctance to switch wells or to take other steps to purify water.
The marked difference in the arsenic content of vegetables could be related to the arsenic content of groundwater. The groundwater arsenic data revealed elevated arsenic in water draining the Gangetic or Meghna–Brahmaputra alluvium compared to the Teesta alluvium. This conﬁrms the role of groundwater in the arsenic content of crops. Farid et al. (2003) also found that the accumulation of arsenic was greater in similar vegetables grown on soils belonging to Gangetic alluvium compared to those growing on soils of Teesta alluvium.