量子点增敏碱性鲁米诺-高碘酸钾化学发光法测定五氯酚钠

Determination of Sodium Pentachlorophenate by Chemiluminescence of CdTe Quantum Dots Enhanced Luminol-Potassium Periodate System

在强碱性介质中,CdTe量子点对鲁米诺-高碘酸钾化学发光体系具有强烈的增敏作用,加入五氯酚钠又会对CdTe量子点增敏后的鲁米诺-高碘酸钾体系的化学发光产生猝灭效应,据此建立了测定环境水样和黄土中五氯酚钠含量的流动注射-化学发光法。考察了试剂浓度和泵速等试验条件对分析结果的影响。在最佳条件下,化学发光强度的改变值与五氯酚钠的质量浓度在8.0×10-5~1.0×10-3g·L-1范围内呈线性关系,检出限(3σ)为6.5×10-5g·L-1。将该法用于水样、黄土样中五氯酚钠的检测,加标回收率在95.0%~103%之间,测定值的相对标准偏差(n=5)在0.58%~2.9%之间。

A method of chemiluminescence coupled with flow injection was proposed for the determination of sodium pentachlorophenate(PCP-Na)in water and loess,based on the inhibition effect of PCP-Na on the chemiluminescence of the CdTe quantum dots-luminol-KIO4 system in alkaline medium,in which CdTe quantum dots showed a strong enhancement effect on the chemiluminescence of luminol-KIO4 system.The effects of experimental conditions were investigated.Under the optimized conditions,linear relationship was found between the changes of the chemiluminescence intensity and the mass concentration of PCP-Na in the range of 8.0×10-5~1.0×10-3g·L-1 with detection limit(3σ)of 6.5×10-5g·L-1.The method was applied to determine PCP-Na in water and soil samples,giving recovery rates measured by standard addition method in the range of 95.0%-103%and RSD(n=5)in the range of 0.58%-2.9%.