Quick valence analysis method of vanadium toward accurate toxicity assessment of vanadium-containing hazardous wastes

钒的快速价态分析方法及其用于含钒有害废弃物毒性的准确评价

In order to develop a quick, efficient and sensitive valence analysis method of vanadium(Ⅴ), the highperformance liquid chromatography(HPLC) was utilized to separate and quantify EDTA-complexed Ⅴ(Ⅲ), Ⅴ(Ⅳ) and Ⅴ(Ⅴ) ions. The influence of EDTA, TBAOH, solution pH and organic modifier on retention behavior of V-EDTA complexes was investigated. Complexed Ⅴ(Ⅲ), Ⅴ(Ⅳ) and Ⅴ(Ⅴ) ions can be separated and quantified in 5 min, with detection limits of 0.04 mg/L Ⅴ(Ⅲ), 0.07 mg/L Ⅴ(Ⅳ), and 0.06 mg/L Ⅴ(Ⅴ), respecti vely. The established method is applied to analyzing the hazardous waste of V-Cr-bearing reducing slag and results demonstrate 49.94% of its Ⅴ element to be toxic Ⅴ(Ⅴ). This work opens a new avenue for quick and accurate toxicity assessment of hazardous wastes containing multivalent heavy metals.

为了开发一种快速、高效、灵敏的钒(Ⅴ)价态分析方法,利用高效液相色谱(HPLC)分离和定量EDTA络合Ⅴ(Ⅲ)、Ⅴ(Ⅳ)和Ⅴ(Ⅴ)离子。研究EDTA、TBAOH、溶液pH和有机改性剂对Ⅴ-EDTA络合物保留行为的影响。络合之后的Ⅴ(Ⅲ)、Ⅴ(Ⅳ)和Ⅴ(Ⅴ)离子可在5 min内分离和定量,检测限分别为0.04、0.07和0.06 mg/L。将所建立的方法应用于含钒铬还原渣危险废物的分析,结果表明含钒还原渣中49.94%的钒为有毒钒。这项工作为含多价重金属危险废物的快速、准确毒性评估开辟了新途径。