The same method is recommended here. They used sequential extraction to determine carbonate and hydroxide fractions with arsenic in sediments. Speciation modeling was used to calculate saturation indices for minerals like siderite and rhodochrosite which can decrease concentrations of dissolved iron and manganese. The results have been mentioned as per the findings at various places of china under various studies.
Back in 1999, Wen Jinbao, a Chinese deputy prime minister, warned of the dire water situation in China and of looming water shortages. Since then, Mr. Wen has assumed the post of prime minister and predgled to provide clean water for his people. His administration has guaranteed an additional $240 million this year to achieve this end. However, this amount may not be nearly enough to satisfy China's massive demand. The country has long suffered from alternating periods of severe flooding and drought. Combined with high pollution levels and a history of heedless and haphazard policies, the country is witnessing a precipitous drop in this most essential supply. High ranking officials and international agencies alike are deeply concerned about the situation and with good reason.
According to hydrologists, government officers and industrial leaders, water and waste pollution is the single most serious issue facing China. Presently, one in three rural inhabitants lacks access to safe drinking water. The urban situation is not any more heartening. More than a hundred large cities are short of water and half are considered to be seriously threatened by the shortage. In the northern region of the country, the water table has dropped more than a meter. Even in the capital city of Beijing, the water supply per individual is only 300 cubic meters (66,000 gallons) per year. The country's water resources are among the lowest in the world per capita and concentrated in the south, so that the north and the west experience regular droughts.
Due to inadequate investments in supply and treatment infrastructure, even where water is not scarce, it is rarely clean. Close to 600 million people have water supplies that are contaminated by animal and human waste. Pan Yue, the deputy head of the State Environmental