The Guizhou Singren Thallium Mineralization Of Soil Thallium Environmental Geochemistry

Lanmuchang thallium ore area in Xingren of Guizhou is a independent deposit which was reported firstly in the world and there must be a lot of environment issues in the course of exploitation. Based on the summarization of the ecological environmental geochemistry, environmental geochemistry, environmental engineering science and research situation of the soil heavy metals pollution, the distribution and existing form of these three poisonous elements, thallium, mercury, arsenic in the soil from the Lanmuchang ore area have been studied in this paper. By the method of leaching experiment, the soil is tested and analyzed. The questions, which shall be cared in the course of prevention of thallium pollution, have been discussed in this paper.There are abundant of thallium ore resources in our country. A lot of thallium is released into air, water and soil in the course of exploitation. The thallium can enter into the body of human and living through the way of food chain, and accumulate gradually in the body, then cause chronic thallium poisoning of human groups or endemic disease. With the rapid development of economy, the quantity demanded of resources is becoming larger and larger, so do the quantity of exploitation and utilization, as a result, the environmental pollution of thallium becomes worse and worse. However, little study on environmental pollution problems caused by exploitation of thallium resources has been done. So studying the environmental geochemistry of thallium element is of great meaning.By the method of AES arc emission spectroscopy, atomic fluorescence detection technique, graded form analysis, the content and morphosis of three elements thallium, mercury, arsenic in the 37 pedotheques collected from the ore area have been studied and analyzed in this paper. Shown from study that there are three results as follows: (1)a lot of thallium ,mercury, arsenic come into the soil from the slag through natural leaching; the space distribution of three elements' content in the soil is relative to each other. Through analyzing the content and the physical and chemical properties of the soil, we find that the soil pollution state of the area is very bad and there is an apparent relation between the organic matter and these three elements; (2)the morphosis analysis of the soil contaminant can explain the poisoning degree of the soil heavy metal to the plant, animal and microbe, so it plays a main role in estimating the soil heavy metal pollution; (3) it ought to think over the heavy metal's transport disciplinarian during the process of carrying out the method of incorporation with extra soil, and various methods should be used in preventing of the soil heavy metal pollution to obtain the optimal effect.The soil pollution should be worse because of the long period of leaching of the slag, and the deterioration of environment by thallium pollution has a close connection with people's health. So the research and prevention of thallium pollution have become environmental issues which can not be ignored.