【摘要】 建立了离子色谱-氢化物发生原子荧光光谱联用分离4种常见有毒砷化合物的方法。二者通过内径0.25 mm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5~1000μg/L,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。更多还原

【Abstract】 A method has been developed for the speciation of dimethylarsinic(DMA),arsenite As(Ⅲ),monomethylarsonic(MMA) and arsenite As(Ⅴ) by ion chromatography coupled hydride generation-atomic fluorescence spectro-(metry.) 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 μg/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.更多还原