氢化物发生等离子发射光谱法测定纺织品中可萃取砷(Ⅲ)

Determination of As(Ⅲ) in Textile by Inductively Coupled Plasma Atomic Emission Spectrometry Via As(Ⅲ) Hydride Generation

建立一种氢化物电感耦合等离子体发射光谱法测定纺织品中砷（Ⅲ）的方法,纺织品中的微量砷经酸性试液萃取、过滤后,经过直接氢化物发生器形成砷化氢,进入等离子发射光谱仪进样系统进行定量测定.工作曲线线性相关系数大于0.999 9,线性范围为0.003 76-0.24 mg/L.该方法对砷（Ⅲ）的检出限为0.0005mg/L.对0.1-1.0mg/kg范围内的4个添加水平的平均回收率在94.8%-99.0%之间,相对标准偏差（n=6）在2.8%-0.7%之间.与电感耦合等离子发射光谱法相比,该方法具有基体背景干扰小,准确性高,检出限低等特点.

A method has been developed for the determination of As（Ⅲ） in textile by inductively coupled plasma atomic emission spectrometry（ICP-AES） via As（Ⅲ） hydride generation.The As（Ⅲ） in textile wasfirst extracted with an acidic solution,which was passed a hydride generator to convert the As（Ⅲ） into As（Ⅲ） hydride.The amount of As（Ⅲ） in the hydridewas determined by ICP-AES.In this study,the conditions for hydride generation were optimized.Under the optimal hydride generation conditions,the linear correlation coefficient in the range of 0.003 76 - 0.24 mg/LAs（Ⅲ） was greater than 0.999 9 with an minimum detection limit of As（Ⅲ） of 0.000 5 mg/L.The mean recoveries of As（Ⅲ） at four levels（0.1,0.2,0.5,1.0 mg/kg） were 94.8%- 99.0%with relative standard deviations（n =6） between 2.8%-0.7%.As compared to ICP-AES method,the method presented in this study can determine as low as 0.000 5 mg/LAs（Ⅲ） with much higher accuracy due to the smaller interference of matrix background.