不同浸提方法对土壤及蜈蚣草中砷形态浸提效果  

Effect of different extraction methods on arsenic speciation extraction in soil and pteris vittata L.

作　　者：马杰[1] 韩永和[2] 周小勇[1] 王洪波[2] 雷梅[1] 李艳梅[1] 陈同斌[1] 

机构地区：[1]中国科学院地理科学与资源研究所环境修复中心 [2]中国人民解放军61699部队

出　　处：《现代仪器》2012年第2期16-19,共4页Modern Instruments

基　　金：国家自然基金项目(41071215;U0833004);国土资源部公益性科研行业专项(201111020)

摘　　要：采用几种常见浸提方法对砷污染土壤和蜈蚣草样品进行处理,并使用LC-AFS测定砷形态,重点考察不同浸提方法对样品砷浸提效果的差异,以及其形态分布特征。结果表明:土壤和蜈蚣草中砷主要以As(Ⅲ)和As(Ⅴ)的无机形态存在。土壤、蜈蚣草根和蜈蚣草叶中As(Ⅲ)所占比例分别为11.6%,24.2%和73.8%。磷酸150℃高温浸提对土壤的浸提效率最高,可达41.0%;甲醇/水(1:9)超声浸提对蜈蚣草根和叶有最高的浸提效率,分别为60.2%和82.5%。样品加标回收率和相对标准偏差分别在92.7%～108.4%和2.05%～10.49%范围内。Several common arsenic speciation extraction methods were used to extract the arsenic-contaminated soil and Pteris vittata L.using LC-AFS determination,in order to compare the extraction efficiency and distribution of arsenic speciation.The results showed that arsenic species in the arsenic-contaminated soil and P.vittata L.were mainly inorganic arsenic as As（Ⅲ） and As（Ⅴ）.In soil,root and leaf of P.vittata L.,As（Ⅲ） accounted for 11.6%,24.2% and 73.8%,respectively.By phosphate acid high-temperature（150℃）,extraction efficiency for soil was the highest as 41.04%.Methanol/water（1：9） ultrasonic extraction of root and leaf of P.vittata L.had the highest extraction efficiency,up to 60.2% and 82.5%,respectively.Sample recoveries were 92.7%~108.4% and relative standard deviations were 2.05%~10.49%.

关 键 词：砷形态 浸提 土壤 蜈蚣草 

分 类 号：X171.5[环境科学与工程—环境科学]