土壤中Sb(III)和Sb(V)的有效提取与测定

Effective Extraction and Determination of Sb(III) and Sb(V) in Soil

摘要:

锑的各种形态中三价锑和五价锑的毒性较高，在城市土壤锑组成中占比也较高。研究了萃取方式、萃取剂、萃取条件、色谱分离流动相条件等因素对土壤中价态锑提取和分析的影响，建立了完整的土壤价态锑萃取-分析方法。研究推荐以柠檬酸溶液为萃取剂，70℃恒温振荡萃取的方式提取价态锑，萃取液以乙二胺四乙酸二钾＋邻苯二甲酸为流动相，经色谱分离后利用电感耦合等离子体质谱仪对不同价态的Sb进行分析。所建立的方法检出限低，准确性精密度好，可用于实际土壤样品中价态锑的有效提取与测定。

Abstract:

Among the various forms of antimony（Sb）， Sb（III） and Sb（V） have higher toxicity and a higher proportion in the composition of antimony in urban soil. This research investigated the effects of factors including extraction instrument， extractants， extraction conditions， and chromatographic separation mobile phase conditions on the extraction and determination， and established a novel extraction-determination method for Sb（III） and Sb（V） in the soil. The highest extracting efficiency was obtained by soaking and oscillating soil samples in citric acid solution at 70℃ first， then separated with dipotassium edetate and phthalic acid as mobile phase by liquid chromatography， and finally measured by inductively coupled plasma mass spectrometry. With the proposed method， low detection limits， good accuracies and precisions for both of Sb（III） and Sb（V） were obtained. It was highly recommended for the effective extraction and determination of antimony speciation in real soil samples.