摘要
采用玻璃板表面微层水采样器采集表面微层湖水，利用高效液相色谱－氢化物发生－原子吸收联用技术测定水样中亚砷酸盐、砷酸盐、一甲基胂酸盐（ＭＭＡ）和二甲基胂酸盐（ＤＭＡ）含量，并和相应表层湖水（水面下０．５ｍ）中相同４种砷形态含量对比。结果表明，４种砷形态在湖水表面微层和表层中的含量分布有较大差异，表面微层水中的含量通常高于表层水。它们在湖水表面微层中具有一定的富集现象，富集倍数分别为ＡＳ（Ⅲ）１．６６，ＡＳ（Ｖ）１．３５，ＭＭＡｌ．５８，ＤＭＡｌ．０９；湖水表面微层和表层中占优势的砷形态均为ＡＳ（Ｖ），在表面微层和表层湖水中存在的有机砷形态主要为ＤＭＡ；砷存在形态及含量随采样站位不同而有所不同。
Water samples were collected both from the surface microlayers of natural lakes by using a glass plate surface microlayer water sampler and from the surface layers in a depth of 0.5 m under water surface by using a conventional water sampler, and analyzed for arsenite, arsenate,monomethylarsonate(MMA) and dimethylarsinate(DMA) by using a high performance liquid chromatography/hydride generation/atomic absorption spectrometry technique. The concentrations of arsenic species in surface microlayer water were compared to those in surface layer water.The results show that the arsenic species in surface microlayer water had a significantly different distribution from these in surface layer water and had their concentrations usually higher than these in surface layer water, indicating that they were richer in surface microlayer water with an enrichment factor of 1.66, 1.35, 1.58 and 1.09 for As(Ⅲ), As(V), MMA and DMA, respectively.As(V) is a dominant arsenic species present in both surface microlayer and surface layer of lake water, and DMA is a major organic arsenic species present in both layers. The distribution of arsenic species was dependent on sampling sites.
出处
《环境科学》
CAS
CSSCI
CSCD
北大核心
1995年第4期61-63,共3页
Environmental Science
关键词
湖水
表面微层
砷
形态
水质分析
取样器
lake, surface microlayer water, surface layer water, arsenic species, speciation, sampler.
