A chemical plant in the upper reaches of a river in Minquan County, Henan Province, used inferior ore with high sulfur content last year, causing a large amount of arsenic to flow directly into the Dasha River with wastewater. Once the water that has suffered from severe arsenic contamination enters the kitchen of the downstream residents, the consequences will be unimaginable. A cross-provincial "anti-arsenic action" began, downstream damming to block water, and upstream wolves were "disinfected". Dr. Gong Wenxin from the Center for Eco-Environmental Research of the Chinese Academy of Sciences said: "This large-scale treatment of arsenic-contaminated water is the first in China. It may be the largest in the world."
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