原子荧光光谱法测定污水中总砷的条件优化与干扰消除

Optimization of Determination Conditions and Interference Elimination for Total Arsenic in Sewage by Atomic Fluorescence Spectrometry

摘要: 砷及其化合物危害人体健康，精准测定污水中总砷含量意义重大。本研究以原子荧光光谱法测定污水中总砷，针对实验条件优化与干扰消除展开研究。通过正交实验和单因素实验，对反应温度、盐酸加入量、硫脲–抗坏血酸用量、反应时间等因素进行考察，确定了优化条件。同时研究单一及实际污水中多种干扰物质的影响，并提出消除方法。经标准物质验证和实际样品加标回收实验，证明优化后的条件可靠，测定结果准确，精密度良好，为污水中总砷的测定提供了有效方法。

Abstract: Arsenic and its compounds pose significant risks to human health, making the accurate determination of total arsenic in sewage of great importance. This study employs Atomic Fluorescence Spectrometry (AFS) to determine total arsenic in sewage, focusing on the optimization of experimental conditions and the elimination of interferences. Through orthogonal and single-factor experiments, factors such as reaction temperature, hydrochloric acid dosage, thiourea-ascorbic acid dosage, and reaction time were investigated to establish optimal conditions. Furthermore, the effects of various interfering substances in both single-component solutions and actual sewage samples were studied, and methods for their elimination were proposed. Validation using certified reference materials and spike recovery experiments on actual samples demonstrated that the optimized conditions are reliable, yielding accurate results with good precision. This study provides an effective method for the determination of total arsenic in sewage.