Heavy metal pollution refers to the environmental pollution caused by heavy metals or their compounds.It tend to be enrichment.And it is hard to be broken down in the environment.
what happened these years in China ？
Q：Where does it come from？
A: Pollution by emission
Pollution from industry emission is the main source of heavy metal pollution in China. In coal burning areas, the different contents of heavy metals in the coal have affected the emission of heavy metals into the atmosphere.
Arsenic: is one of the components of arsenic（砒霜）, highly toxic and can cause person quickly die. Long-term exposure to small amounts, can cause chronic poisoning（慢性中毒）. There are also carcinogenic（致癌）。
In 2010,many children were found to blood lead levels.( 血铅超标)
In 2011，over 300 people were found to blood lead leavels because of the local battery enterprises pollution.(当地电池企业污染)
polluted by heavy metals,
the selection of crops with
low uptake rates should be
considered when fertilizing
the sludge. The excessive
usage of chemical
fertilizer and agrochemicals also increased
from the nature to human
heavy metal rmland.
Q：How does it affact our life ?
the standard of heavy mental in GB2006
some heavy mental :
Q:Then，how to do it？
A: Conclusion The geological background level of heavy metal is low in
China, but with the activity of human being, a high anthropogenic emission of heavy metals occurs into the biosphere from the industrial emission, wastewater and waste solids. Those contaminants pollute the environment such as the soil, water and foods, which animals and human beings live on. Heavy metals will accumulate in plants, and especially in foods to bring the toxicity and diseases of geological and environmental origin to human beings. Most severe is that this kind of pollution is covert, long-term and non-reversible.
Q:What happed about heavy mental pollution?
A:There are two heavy mental pollution in the eight
environmental pollution events （八大环境公害事件）Japan minamata disease events caused by Hg,Japan's toyama bone pain disease events caused by Cd.
In China：In 2008,arsenic pollution incidents happened in five regions.
In June 2009, the hunan illegal transfer of chromium slag cause chromium pollution incidents（非法转移含铬废渣）
Pollution by wastewater irrigatio（废水灌溉）
Wastewater irrigation is very common in China, especially in the northwestern area, where there is a lack of water resources. In China, 60-80% of the wastewater is due to industrial effluents. Untreated sewage water irrigation was the major source of increasing soil and crop metals.
A:The original meaning of heavy mental refers to the metal whose proportion (比重) is greater than 5，including gold, silver, copper, iron, lead ，etc。It is widely distributed.It exists in the air, dringking water, soil,automobile exhaust,etc.
Mercury: after eating directly into the liver, damage to the brain, nerves, vision greatly.
Cadmium:lead to high blood pressure, cause disease of heart head blood-vessel,and lead to kidney failure（肾衰竭）.
2.The soil-plant system plays an important role in the solar energy transport to bio-energy, and plants would be helpful to clear the heavy metal pollution in the biosphere. Phytoremediation would be an effective techniqueto remediate heavy metal pollutions.
Recommendations and Outlook
1.Therefore, humans should be careful with heavy metal pollutedwater and food.
1)To import food from areas not polluted by heavy metals and 2）Drink safe water would be a way to avoid these heavy metals from being transferred to humans via the food chain（通过食物链）. 3）but to remediate and improve environmental quality is a longterm strategy for the polluted area to keep humans healthy and away from geological disease.
Pollution by waste fertilization (滥 用化肥)
Fertilizing sludge in
farm fields, has led to an
increase of nitrogen and
phosphate（磷酸） in
nutrients. Soil is heavily
Lead：Can directly damage the person's brain cells, especially of the baby's nervous system（神经系统）, can cause congenital mental retardation，probably ADHD（多动症）
Fortunately, studieson phytoremediation(植物修复) for heavy metals is wide spread throughout the world. As an optimum（最好地）, a clean biosphere（生物圈） could be displayed in front of us in the near future.