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《Geological Review》 2006-06
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The Analysis on the Forms of Arsenic in the Soils Formed from the Middle Devonian Donggangling Formation in Eastern Mashan County,Guangxi Zhuang Autonomous Region,and Its Ecological Effect

XIE Yunqiu, ZHANG Cheng, LV Yong, DENG ZhenpingInstitute of Karst Geology, Chinese Academy of Geological Sciences Guilin, Guangxi, 541004  
Will high content of arsenic in calcareous soils impact karst ecosystem On the section of the Donggangling Formation of the Middle Devonian(D_2d) in eastern Mashan county, Guangxi Zhuang Autonoumous Region, soil were sampled on the basis of petrographic differences to test water-soluble, ion-exchangeable, carbonate-bound, organic matter-bound, oxide-bound, sulfate-bound and total arsenic. The flower, leaves, branches and stem of Lonicera hypoglauca Mig. growing in the soil of the Lower part of the Donggangling Formation were tested for arsenic, too. The results show that total arsenic in the D_2d is averagely 34.0μg/g with the lowest of 23.3μg/g in the lower part of the Donggangling Formation. The sulfate-bound fraction predominates more than 85%. Available arsenic composed of water-soluble and ion-exchangeable fractions is less than 0.1% seemingly correlating little with total arsenic. The flower, leaf, branch and stem of Lonicera hypoglauca Mig. has 0.30, 0.21, 0.01 and 0.07μg/g arsenic, less than the limited value of Green Professional Standard for the Import and Export of Medical Plants and Their Preparation, P. R. China. So, soil arsenic from the Donggangling Formation may mainly exist in the form of inorganic sulfate-bound fraction of five valence and be less harmful to medical plants because the soil has high pH, iron oxides and low P, adsorbs the arsenic strongly.
【Fund】: 国家自然科学基金资助项目(编号40272132);; 广西科学基金项目(编号桂科自0229062)资助
【CateGory Index】: X53
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