贵州某煤矿区周边耕地土壤有效态砷提取方法比较  

Comparison of extraction methods of available arsenic from farmland soil around coal mining area in Guizhou

作　　者：商成梅 龙胜楼 欧灵芝 唐明 李菲[1,2,3] 孙媛媛 SHANG Cheng-mei;LONG Sheng-lou;OU Ling-zhi;TANG Ming;LI Fei;SUN Yuan-yuan(Guizhou Provincial Key Laboratory of Plant Physiology and Development Regulation,Guiyang 550025,China;Key Laboratory of Southwest Karst Mountain Biodiversity Conservation,State Forestry Administration,Guiyang 550025,China;School of Life Sciences,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州省植物生理与发育调控重点实验室,贵州贵阳550025 [2]国家林业局西南喀斯特山地生物多样性保护重点实验室,贵州贵阳550025 [3]贵州师范大学生命科学学院,贵州贵阳550025

出　　处：《应用化工》2023年第6期1933-1938,共6页Applied Chemical Industry

基　　金：国家自然科学基金(41761071);贵州省科技厅支撑计划项目(黔科合支撑[2020]4Y032);贵州省科技项目(黔科合平台人才[2017]5726-26)。

摘　　要：为探究操作简单、高效且适合某煤矿区周边土壤砷有效态的提取方法,贵州以某矿区周边土壤(4个点位S1~S4)为研究对象,选择5种提取剂(DPTA-CaCl_(2)-TEA、KH_(2)PO_(4)、NH_(4)H_(2)PO_(4)、NaHCO_(3)、CaCl_(2))对土壤中有效态砷进行提取,筛选出高效的提取剂。结果表明:(1)5种提取剂对土壤中有效态砷提取效果差异较大,提取能力大小依次为:NH_(4)H_(2)PO_(4)>KH_(2)PO_(4)>CaCl_(2)>NaHCO_(3)>DPTA-CaCl_(2)-TEA;(2)NH_(4)H_(2)PO_(4)溶液对土壤有效态砷的提取量分别为13.20(S1),10.95(S2),12.64(S3),5.46(S4)mg/kg;(3)就同一提取剂而言,不同土壤的提取效率差异较大,土壤有机质、全氮、全砷、全镉和全锌可显著影响土壤有效态砷含量;(4)建议选用0.05 mol/L NH_(4)H_(2)PO_(4)对该矿区周边土壤有效态砷进行提取。In order to explore a simple,efficient,and appropriate extraction method for available arsenic in the soil around a coal mining area,this paper takes the soil around a mining area(four points S1~S4)as an research object,five types extractants(DPTA-CaCl_(2)-TEA,KH_(2)PO_(4),NH_(4)H_(2)PO_(4),NaHCO_(3),CaCl_(2))were selected to extract the available arsenic in the soil and filter out the most efficient extractant.The results showed the following:The extraction effects of the five extractants on effective arsenic in soil were quite different,and the order of extraction capacity was:NH_(4)H_(2)PO_(4)>KH_(2)PO_(4)>CaCl_(2)>NaHCO_(3)>DPTA-CaCl_(2)-TEA.The extraction capacity of NH_(4)H_(2)PO_(4) were 13.20(S1),10.95(S2),12.64(S3),5.46(S4)mg/kg respectively.For the same extractant,the extraction efficiency of different soils varied greatly.Soil organic matter,total nitrogen,total arsenic,total cadmium and total zinc can significantly affect the soil available arsenic content.It is suggested to use 0.05 mol/L NH_(4)H_(2)PO_(4) to extract available arsenic from the soil around the mining area.

关 键 词：矿区 耕地 有效态砷 提取方法 

分 类 号：TQ126[化学工程—无机化工] TQ421[环境科学与工程—环境工程] X53