污染土壤和底泥中可提取态有机卤化物的分析方法研究-环境科学学报.PDF

第 22 卷第 6 期 环 　境 　科 　学 　学 　报 Vol . 22 ,No . 6 2002 年 11 月 ACTA SCIENTIAE CIRCUMSTANTIAE Nov. ,2002 ( ) 文章编号 2002 　　　中图分类号 :X53 　　　文献标识码 :A 污染土壤和底泥中可提取态有机卤化物的分析 方法研究 ( 中国科学院沈阳应用生态研究所陆地生态过程重点实验室 ,沈 任丽萍 ,周启星 ,宋玉芳 ,李培军　 阳　110016) 摘要 :选用甲苯正己烷 、丙酮正己烷两种混合溶剂作为污染土壤和底泥中可提取态有机卤化物的提取剂 ,与乙酸乙脂作为 提取剂进行三种溶剂超声法提取效率的比较 ,采用微库仑法进行测定方法改进的研究. 实验结果表明,采用 1 ∶9 的丙酮正己 烷混合溶剂的提取效率较高 ,其平均回收率与乙酸乙脂法接近 ,而且回收率范围比乙酸乙脂法波动更小. 以 1 ∶9 的丙酮正己 烷混合溶剂作为提取剂的方法还表明:无机可溶性卤化物对 EOX 测定不产生干扰 ,分析方法的最低检出浓度范围为 01 — 04 mg (Cl) kg ,测定范围为 0 —25000 mg (Cl) kg ,添加标准样品的相对标准偏差为 338 % —509 %. 关键词 :分析方法改进 ;土壤环境 ;底泥 ;有机卤化物 ;可提取态 Study on an analytical method of extractable organic halogens in contam inated soils and sediments ( REN Liping , ZHOU Qixing , SONG Yufang , LI Peij un 　 Key Laboratory of Terrestrial Ecological Process , Chinese Academy of Sciences , Shenyaog 　110016) Abstract :Two mixed solvents ,toluenenhexane and acetoneNhexane were used as extractant for determination of extractable organic halogens ( EOX) in contaminated soils and sediments. A comparison of extractable efficiency between the two mixtures and ethyl acetate as an extractant was made using the improved method of ultrasonic extraction and microcoulometric determination . The experimental results showed that the ex tractable efficiency of acetoneNhexane ( VV = 1 ∶9) was higher than that using other extractants and its recovery rate was close to that of ethyl acetate . There was a small fluctuation in the recovery rate when the acetoneNhexane was used. It was also indicated that the soluble in organic halogens does not interfered the determination of EOX ,the lowest detectable concentration is 0 . 1 —04 mg ( Cl) kg