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On Monday, seven people were arrested in connection to cadmium pollution in a major river in China's southern Guangxi Autonomous Region. The suspects were managers of chemical companies, including the Jinchengjiang Hongquan Lithopne Material Company in Hechi City. Cadmium was first found in the Longjiang River, a tributary upstream of the Liujiang River, in mid-January. The concentration levels near the Lalang reservoir were 80 times above the official limit of 0.005 milligrams per liter. Cadmium is a cancer-causing chemical used for making batteries. It can damage the liver and kidneys, and reduces bone density. Environment protection staff poured aluminum chloride into the river to dissolve the contaminants. But the pollutants were still flowing downstream—threatening water supplies for millions of residents living in Liujiang City. The local environmental watchdog has set up observation stations along the polluted sections of the river to check the water quality.