The heavy metals, which mainly include lead, mercury, chromium, cadmium and arsenic, has badly affected the environment and public health in China. We may know that excessive levels of heavy metal in humans can cause irreversible harm. The toxic elements accumulate in organs over time, leading to chronic disease. Once heavy metals are released into water or land, they are difficult to extract and will have a negative impact on that land in the future, environmental experts said.
And more than 30 large heavy-metal poisoning incidents in China have occurred since 2009, posing a large threat to public health, especially to the children. So there's a plan adopted to tackle heavy-metal pollution in 12th Five-Year Plan (2011-2015), China.