In 2011, the Ministry of Environmental Protection announced that the “Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution†was approved, and 14 Inner Mongolia, Jiangsu, Zhejiang, Jiangxi, Henan, Hubei, Hunan, Guangdong, Guangxi, Sichuan, Yunnan, Shaanxi, Gansu and Qinghai. The provinces and districts are listed as key provinces. The shadow of the “cadmium meter†crisis in May has not been scattered yet, and the problem of heavy metal pollution in the soil has surfaced. The Ministry of Land and Resources released a message this week that China is drawing a map of soil heavy metal pollution. According to the study, the area of ​​heavy metal pollution in China has expanded significantly and spread to densely populated areas in the east.
a "secret" investigation
â—In 2006, the Ministry of Environmental Protection and the Ministry of Land and Resources organized a nationwide soil pollution survey. The survey plan was distributed to local environmental monitoring stations, requiring local monitoring personnel to use GPS guidance and strictly follow the grid of 4×4 square kilometers. Mode sampling.
â— By the end of 2008, a total of 213,754 samples of soil and agricultural products were collected, and 4.95 million valid survey data were obtained. A national soil pollution survey database and sample database were built.
â—In 2009, the Ministry of Environmental Protection compiled a general report on pollution investigation and various special reports, “Completing 12 pilot projects, 18 research reports and 7 draft technical guidelines for contaminated soil remediationâ€. However, the survey, which cost as much as 1 billion yuan, has not been released to the public.
â— In 2013, Beijing lawyer Dong Zhengwei submitted an application for government information disclosure to the Ministry of Environmental Protection, requesting “open data, investigation basis, pollution causes and prevention measures and methods and methods of soil pollution surveyâ€. However, the Ministry of Environmental Protection will not disclose it on the grounds of "state secrets."
Some general, horrible data
â— The Ministry of Land and Resources has publicly stated that China has 12 million tons of grain per year contaminated with heavy metals, and its direct economic losses exceed 20 billion yuan. And these foods are enough to feed more than 40 million people every year.
â— Xinhua News Agency reported that from 2009 to 2012, China had more than 30 heavy and heavy metal pollution incidents.
â— According to a 2010 study by the China National Rice Research Institute and the Ministry of Agriculture's Rice and Products Quality Supervision, Inspection and Testing Center, one-fifth of China's cultivated land was contaminated by heavy metals.
â— Researcher Chen Tongbin from the Institute of Geographical Sciences and Resources of the Chinese Academy of Sciences estimates that the proportion of cultivated land contaminated by heavy metals is likely to be around 10% nationwide.
◠According to official data, the area of ​​land polluted by heavy metals in Hunan Province is 28,000 hectares, accounting for 13% of the province's total area.
Heavy metal pollution in cultivated land in China
The largest proportion of cadmium and arsenic pollution
According to the China National Environmental Monitoring Center, the most serious heavy metal pollution in China is cadmium pollution, mercury pollution, lead pollution and arsenic pollution. Researcher Chen Tongbin of the Chinese Academy of Sciences pointed out that the proportion of cadmium pollution and arsenic pollution in heavy metal pollution in cultivated land is the largest, accounting for about 40% of contaminated cultivated land, respectively.
Arsenic Pollution Center for Environmental Remediation Research, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, in recent years, said that there are a large amount of arsenic slag discarded in Liannan, Guangxi, Nanchang, Hunan, Changning, Changde, and Zhangzhou, resulting in arsenic content in crops around the mining area. More than a hundred times more than the national standard.
Cadmium pollution The China Rice Research Institute and the Ministry of Agriculture's 2010 study said that cadmium-contaminated arable land involved 25 regions in 11 provinces. This problem is more prominent in the south of the Yangtze River, such as Hunan and Jiangxi. The PanGengxing team of Nanjing Agricultural University randomly purchased samples from several county-level and above markets in the country. The results showed that about 10% of the commercially available rice cadmium exceeded the standard.
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