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

作　　者：周敏[1] 吴小玲 李聪 马永钧[1] 王爱连[1] 母爱萍 

机构地区：[1]甘肃省生物电化学与环境分析重点实验室甘肃省高分子材料重点实验室省部共建生态环境相关高分子材料教育部重点实验室西北师范大学化学化工学院,兰州730070

出　　处：《理化检验（化学分册）》2015年第4期436-439,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学基金地区基金(21167015)

摘　　要：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%.

关 键 词：化学发光法 流动注射 量子点 鲁米诺 高碘酸钾 五氯酚钠 

分 类 号：X830[环境科学与工程—环境工程] O657.3[理学—分析化学]