| 云南岩溶区As、Cd元素异常特征 |
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| 引用本文： | 王宇,彭淑惠,杨双兰.云南岩溶区As、Cd元素异常特征[J].中国岩溶,2012,31(4):377-381. |
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| 作者姓名： | 王宇 彭淑惠 杨双兰 |
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| 作者单位： | 1.云南省地质环境监测院 |
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| 基金项目： | 中国地质调查局项目"云南岩溶石山地区重大环境地质问题研究" |
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| 摘 要： | 云南岩溶区水系沉积物中As、Cd元素含量分别为6.7~14.9ppm和0.14~0.21ppm,普遍高于省内其它地区。云南不同岩溶区As、Cd元素含量高异常还有较大的差异。As、Cd元素的高异常以滇东南岩溶区最为明显,异常幅度最大;其次为滇东岩溶区、滇西北以及滇西保山—沧源岩溶区;滇东北地区Cd异常较为突出,而As异常较弱。一般从岩石到土壤As、Cd元素呈富集态势,富集约4~5倍。通过对小江流域泸西As、Cd元素高异常区的地球化学和地质环境分析,发现农作物对As吸收量不大,超标率为14.8%;但对Cd元素吸收远高于As元素,超标率高达74.1%。通过对比分析,认为岩溶区碳酸盐岩As、Cd元素的高背景含量(As含量12.89~28.86ppm、Cd含量0.031~0.314ppm)是其风化形成的土壤中As、Cd元素含量高异常的根本来源,As、Cd元素主要通过粘土矿物和有机质的吸附累积而富集。
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| 关 键 词： | 土壤 元素砷 元素镉 岩溶 地质环境 |
| 收稿时间： | 2012/9/17 0:00:00 |
The anomaly features of As and Cd in the karst area in Yunan province |
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| WANG Yu,PENG Shu-hui and YANG Shuang-lan.The anomaly features of As and Cd in the karst area in Yunan province[J].Carsologica Sinica,2012,31(4):377-381. |
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| Authors: | WANG Yu PENG Shu-hui and YANG Shuang-lan |
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| Institution: | 1.Yunnan Institute of Geo-Environment Monitoring, Kunming2.Yunnan Institute of Geological Survey |
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| Abstract: | The content of As and Cd, reaches 6.7~14.9ppm and Cd 0.14~0.21ppm in the stream sediments in Yunnan karst areas, is higher than other areas in Yunnan. The high anomalies in As and Cd content differs a lot in different karst areas in Yunnan. The largest concentration in As and Cd content appears in southeast Yunnan and the anomalous intensity is also biggest in this area, followed by east and northwest Yunnan as well as the Baoshan to Cangyuan area of west Yunnan. Moreover, in northeast Yunnan, the anomalous intensity of Cd is prominent while that of As is not obvious. As and Cd is of high enrichment from rock to soil and the content enrichment ranges reach4 to5 times. Through the geochemical survey and geological environmental analysis on the high anomalous areas in Xiaojiang River basin of Luxi County, it is found that the absorbing amount of As in vegetables is low. Only 14.8% of vegetables exceed the national standard of China. But the absorbing amount of Cd in vegetables is much higher and 74.1% of vegetables exceed the national standard. Through geo-environmental comparative research, the authors summarized that the high anomalies of As and Cd come from the bedrock where is of high background value (As 12.89~28.86 ppm, Cd 0.031~0.314 ppm) in the karst areas. Among all the bedrocks, the background value of carbonate rock is the highest, which is the main cause of the anomalies. The main mechanism of the enrichment is the adsorption and accumulation of clay mineral and organic material in soil, which causes the high enrichment of As and Cd in soils in Yunnan karst areas. |
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| Keywords: | soil As Cd karst geological environment |
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