“…Arsenic has been recognized as a well-known toxic element, and even at low concentrations, long-term exposure to arsenic could lead to kinds of diseases such as skin tumors, liver dysfunction, gangrene and hearing defect (Ji et al, 2011;Ma and Bruckard, 2009;Yang et al, 2007). Environmental Protection Agency (USEPA) has lowered the current maximum contaminant level (MCL) of arsenic in drinking water from 50 ppb to 10 ppb in 2006 (Yang et al, 2007), and, in Korea, MCL of arsenic in soil is 6 mg/kg.…”