摘要
对固体废物中碲(Te)、钯(Pd)、铂(Pt)和锡(Sn)的定量分析有助于识别固体废物和危险废物.本文使用9 mL硝酸、2 mL盐酸、3 mL氢氟酸和1 mL过氧化氢对样品进行微波消解,然后进行赶酸和定容,最后,用电感耦合等离子体发射光谱仪(ICP-OES)测定溶液中Te、Pd、Pt和Sn的含量.本文探讨了预处理的最佳消化温度,分析了仪器不同波长测量结果的差异,并进行检出限测定.结果表明,当消解最高温度为180℃,选择仪器推荐的检测波长时,Te、Pd、Pt、Sn曲线的相关系数在0.9996～0.9999,其检出限为0.1～0.6 mg·kg-1;精密度为1.2％～3.3％,回收率为94.1％～102％.该方法检测效率高,精密度、准确度良好,可满足检测和鉴别需求.
Abstract
The quantitative analysis of tellurium(Te),palladium(Pd),platinum(Pt),and tin(Sn)in solid waste is helpful for the identification of solid waste and hazardous waste.In this study,9 mL nitric acid,2 mL hydrochloric acid,3 mL hydrofluoric acid,and 1 mL hydrogen peroxide were used for microwave digestion of the solidwaste sample,followed by acid removal and constant volume.Finally,the content of Te,Pd,Pt,and Sn in the solution was determined using Inductively Coupled Plasma Optical Emission Spectrometer(ICP-OES).The ideal digestion temperature for pretreatment was covered in this study,along with an examination of the variations determination results between the instrument's different employed wavelengths,and detection limit was determined.The results showed that when the highest digestion temperature was 180 ℃ and the detection wavelengthrecommended by the instrument was selected,the curvescorrelation coefficients of Te,Pd,Pt,and Sn ranged from 0.9996～0.9999,with detection limits of 0.1～0.6 mg·kg-1,respectively;the precision is 1.2％～3.3％and the recovery was 94.1％～102％.This method can satisfy the needs of detectionand identification has a high detection efficiency,good precision and accuracy.
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