单颗粒-电感耦合等离子体质谱测定海水中银纳米颗粒  

Determination of Silver Nanoparticles in Seawater bySingle Particle-Inductively Coupled Plasma-Mass Spectrometry

作　　者：张春梅 徐强[1] 杜静[2] 田甲申[2] 张华[1] ZHANG Chun-Mei;XU Qiang;DU Jing;TIAN Jia-Shen;ZHANG Hua(College of Chemical Engineering,Dalian University of Technology,Dalian 116023,China;Liaoning Ocean and Fisheries Science Research Institute,Dalian 116023,China)

机构地区：[1]大连理工大学化工学院,大连116023 [2]辽宁省海洋水产科学研究院,大连116023

出　　处：《分析化学》2020年第9期1260-1267,共8页Chinese Journal of Analytical Chemistry

基　　金：大连理工大学大型仪器设备维修基金(No.SYSWX201906);黄淮水环境与污染防治教育部重点实验室基金项目(No.KFJJ-2017-11)资助。

摘　　要：建立了单颗粒-电感耦合等离子体质谱法(SP-ICP-MS)量化与表征海水中银纳米颗粒(AgNPs)的方法。筛选了SP-ICP-MS检测海水中AgNPs时的最优驻留时间,通过探究海水基质对AgNPs检测的影响,确定了海水样品稀释倍数,并利用本方法对大连市近岸海域3个站位表层海水样品中的AgNPs进行测定。结果表明,仪器最优驻留时间为100μs,150倍稀释海水样品可提高AgNPs浓度的测定准确度。本方法测定海水中AgNPs数量浓度检出限为9.75×10^3 particles/mL,粒径检出限为12 nm,标称粒径50和100 nm AgNPs的平均加标回收率均大于70%。大连市近岸海域3个站位表层海水样品中均检测出AgNPs,数量浓度最大值为(2.1±0.004)×10^6 particles/mL,最小值为(1.1±0.01)×10^5 particles/mL,粒径分布在18~200 nm之间。本方法具有样品制备简单、分析速度快、颗粒物数量浓度检出限低等优点,为近岸海水中AgNPs的监测分析提供了可靠的分析方法。A method for quantifying and characterizing the concentration of silver nanoparticles(AgNPs)in seawater by single-particle inductively coupled plasma-mass spectrometry(SP-ICP-MS)was developed.The optimal residence time of SP-ICP-MS for detection of AgNPs was investigated.The influence of sea water matrix on detection of AgNPs was investigated,and the dilution ratio of sea water samples was determined.The results showed that the optimal dwell time of the instrument was 100μs,and 150 times dilution of seawater could improve the accuracy of the determination of the concentration of AgNPs.The detection limit of the quantity concentration of AgNPs in seawater samples was 9.75×10^3 particles/mL,the detection limit of particle size was 12 nm,and the average recoveries of AgNPs with nominal particle sizes of 50 nm and 100 nm were above 70%.AgNPs were detected in the surface seawater samples of Dalian coastal waters.The maximum concentration was(2.1±0.004)×10^6 particles/mL,the minimum concentration was(1.1±0.01)×10^5 particles/mL,and the average particle size distribution was between 18 and 200 nm.This method showed many advantages including simple sample preparation,fast analysis speed and low detection limit of particle quantity and concentration.It provided a reliable analysis method for the monitoring and analysis of AgNPs in coastal seawater.

关 键 词：单颗粒-电感耦合等离子体质谱 海水 银纳米颗粒 

分 类 号：O657.63[理学—分析化学] X834[理学—化学]