Conflicting data, experts say Yangzonghai arsenic pollution still needs to be investigated

Reporter: Lin Yu intern: Chi Jie mei "Yunnan Yangzonghai Arsenic pollution degree is so high, and is a sudden uniformity of pollution, if there is no major accident in the vicinity of enterprises, it is not possible to be caused by man-made causes." Because of the unique yangzonghai and arsenic-rich geological environment, arsenic pollution is more likely to be caused by the change of geological environment.　　"In view of the current social concern in Yunnan Yangzonghai arsenic pollution Incident, China Geological Environment Monitoring Institute, a senior expert in an interview with reporters said. It is understood that China's Geological Environment Monitoring Institute is the Ministry of Land and Resources directly under the unit to undertake the national geological hazards monitoring, early warning and related research work. The senior experts said that a number of studies at home and abroad show that the geological environment changes, especially the earthquake, the impact on water resources is very large. After the 5·12 Wenchuan earthquake in China, the water resources in Shaanxi, Sichuan, Yunnan and other places have changed to varying degrees, the mineral indexes of some original qualified mineral water sources have changed greatly after the earthquake, and some places have suddenly increased or narrowed the flow. The geological department has carried out a survey on the water environment of Yunnan Province since 2006, and found that the Yangzonghai area is rich in arsenic, and the content of arsenic in coal seam and geothermal water is much higher than the national average level.　　Therefore, it cannot be ruled out that geological factors have a direct effect on yangzonghai arsenic pollution. In response to the reporter's 5·12 day, the Yangzonghai region did not occur in the earthquake, how can lead to arsenic pollution, the expert said, in fact, "5·12" before and after the extraordinary earthquake, Yangzonghai arsenic content has undergone drastic changes. The increase of arsenic content in lake water reflects the change of geological environment, and there is a time delay process. As in 1995, after 3 weeks of the Hanshin earthquake in Japan, the arsenic content in many monitoring points in Japan is extremely high.　　Seven months after the earthquake, the arsenic content of some rivers in Kansai is still very high. Therefore, from the scientific common sense, at present cannot eliminate the earthquake to the Yangzonghai arsenic pollution The influence, he called for further demonstration investigation, really discovers the pollution reason.　　Based on the Yangzonghai arsenic pollution, the mechanism of disaster emergency research is established, and the investigation and monitoring of the geological environment related to arsenic pollution in Yangzonghai should be carried out as soon as possible to provide scientific data for further research on geo-environmental impact of earthquakes. Zheng Baoshan, a researcher at the Institute of Geochemistry of the Chinese Academy of Sciences, attended a symposium on arsenic exceeding the water body in Yunnan.　　At the meeting, he said that the problem of arsenic in Yunnan is quite complex, so far, the report made by the Environmental Protection Department of Yunnan province can only be said to be a possible conclusion, from a scientific point of view is not a conclusive proof of the conclusion. "In the case of Yangzonghai, there is a contradiction between the data submitted by the prosecution, if the pollution is caused by the enterprise, then the test result should be a slow rise in the concentration of arsenic, but the actual situation is not the case."　　"Zheng Baoshan said. In addition, Zheng Baoshan also questioned whether the prohibition of aquaculture, irrigation and other measures. He believes that if the arsenic-excess water body may have a potential health hazard, and there is no effect on other behaviors such as irrigation and farming, so it is important to reopen the discussion on whether the Yangzonghai arsenic exceeding events can be classified as a major environmental pollution event.　　He called on the relevant environmental departments to scientifically and prudently deal with the pollution incident, to the local people and enterprises a scientific and impartial statement. Yangzonghai, located in the northern part of Chengjiang, Yunnan Province, is one of the 9 great Highland Lakes in Yunnan. In June 2008, the Environmental Protection Department monitored the sudden rise of arsenic concentrations in the Yangzonghai water body, causing a yangzonghai of arsenic contamination in the country.