Arsenic poisoning in groundwater: health risk and geochemical sources in Bangladesh.

摘要: Of the 2508 water samples analyzed in 10 districts of Bangladesh, 51%, on an average, contained arsenic levels 0.05 to 2.50 mg/l. 95% nail, 96% hair, and 94% urine above normal level. Approximately 3.58 million people out a total 17.92 who are drinking containing >0.20 mg/l potentially exposed high risk health hazard. Eight thousand five hundred patients identified; they suffering from various skin lesions, gangrene leg, skin, lung, bladder, liver, renal cancer. A big portion population is highly vulnerable internal cancers. Lowest concentration producing dermatological disease found be 0.103 However, exposure time develop arsenicosis varies case reflecting its dependence level food, nutritional status, genetic variant human being, compounding factors. This study has determined intensity fluorescent humic substances elevated concentrations very low heavy metals. The synergistic/antagonistic effect compounds present may aggravate toxicity arsenic. Geochemical suggests that released both reductive dissolution Fe Mn (oxy)hydroxide microbial oxidation organic matter.