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中文摘要：
建立了离子色谱一氢化物发生原子荧光光谱联用分离4神常见有毒砷化合物的方法。二者通过内径0．25min的PEEK管直接相连。实验对影响分离度和测定灵敏度的参数进行了优化。在优化条件下，质量浓度均为50μg／L的4种砷化合物混合标准溶液平行7次进样，得到DMA、As（Ⅲ）、MMA和As（V）的色谱峰面积的相对标准偏差（RSD）为2．8～3．0％。250μL进样的线性范围为5-1000μL，检出限为0.8～1．2μg／L（三倍基线噪音峰高）。用建立的方法测定了砷处理后的水稻木质部伤流液中的砷量，4种砷化合物的加标回收率为89％-105％。该装置接口简单，方法分离度好。灵敏度高，可用于实际样品中痕量砷化合物的形态分析。
英文摘要：
A method has been developed for the speciation of dimethylarsinic （DMA）, arsenite As（ Ⅲ ）, monomethyl- arsonic （MMA） and arsenite As（ V ） by ion chromatography coupled hydride generation-atomic fluorescence spectrometry. The eluent gradient of IC and the parameters influencing AFS detection were discussed. Under the optimized experimental conditions, the relative standard deviation （RSD） is 2.8 % - 3.0% （n = 7）. The linear ranges for the four species are all between 5 and 1000 lxg/L, while the detection limits are between 0.8 and 1.2 μg/L. The method has been applied to the speciation of arsenic in rice xylem samples and the range of recoveries is 89% - 105%. This simple method, with high sensitivity and low detection limit, can be applied to practical environmental samples.
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