| With the increase of foreign and domestic market demand for manganese, the development in industry of electrolysis manganese was rapid in the world. And above all in our country, this development was also improved by leaps and bounds. However, it also leads to many ecological environment problems. Three wastes existed potential risks to environment. Se and heavy metals pollution also damaged environment nearby in industry of electrolysis manganese.Manganese ore stone, manganese residues and surrounding soil, plants and water which comes from10typical electrolysis manganese industries was used in this paper. This paper used microwave and electrolytic plate digestion for pretreat samples and quantitative analyzed10types of elements by ICP-MS technology, including Se, Cr, Mn, Co, Ni, Cu, Zn, As, Cd, Pb. It further comprehensive analyzed pollution which came from electrolysis manganese industry affected on neighboring soil, plant and water. Testing results of soil samples based on the national background average value. And the results of water sample based on standard of drinking water and groundwater. Enrichment extent of monitored elements in accessory soil with plants was researched in this paper. Six kind species of10types of elements were extracted in manganese residues by SES technology. The characteristics about migration and transformation of monitored elements in manganese residues were studied by combining analysis results of HPLC-ICP-MS. Finally, it further studied toxicologic characteristics of Se was studied furtherly by synchrotron radiation XANES technology.Results showed that raw materials about the industry of electrolysis manganese had potential risk. Many associated elements existed in manganese ore stone and its grade was generally low. However, the situation of association was very complex. Relative content of Se and heavy metal elements was higher. Soil, plants and water near by electrolysis manganese industry suffered serious pollution by three wastes which from industry. This pollution of Se and Cr was mainly showed. It had affected human health and safety living in surrounding in industry of electrolysis manganese and also was a great environmental risk and potential troubles.By the extent of the pollution about land soil was more serious than rice paddies. It mainly showed Se and Cr pollution. But the content of monitored elements was gradually decreased with the increase of distance between sample point and manganese residues library. Capacity of the enrichment was generally stronger to monitored elements each part of plant. This capacity of Se was strongest and secondly was Cr. The extent of exceeding standard on monitored elements in accessory soil with plants proportional to it's enrichment in plant. This extent to the edible part of crops was more serious. Content of Mn in the river water surrounding manganese residues library was143.49times than that in the groundwater III type of standard. Generally, the exceeding multiple of farmland water was lower than river water. The content of Mn and Se in resident drinking water was beyond national sanitary standard for living and drinking water. Therefore, there was a huge water environmental risk.The biggest source of environmental pollution was manganese residues. But the content of monitored elements was relatively bigger. In the natural conditions, Se and some heavy metal elements, including water dissolves species, exchangeable species and sour dissolves species, could migrate and transform to external environment. With acidity increase in environment, the capacity of migration and transformation was increased gradually. Qualitative analysis by synchrotron radiation technology was showed that the species of Se in manganese residues was mainly SeO32-, but the toxicity of this species was largest. It closely related to add SeO2to the process of technology. Only a small amount of Se was contained in products but most of rest accessed to manganese residues library along with filter residues. A large number of materials containing Se were sent to the environment under the long-term soaked and scoured action of rain. It not only polluted groundwater and crops even threaten human life.Figure [21] table [29] reference [80]... |
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