title: Ferric ion induced enhancement of ultraviolet vapour generation coupled with atomic fluorescence spectrometry for the determination of ultratrace inorganic arsenic in surface water.
abstract: A novel method of ultraviolet vapour generation (UVG) coupled with atomic fluorescence spectrometry (AFS) was developed for the determination of ultratrace inorganic arsenic (iAs) in surface water. In this work, different ferric species were utilised for the first time as an enhancement reagent for the ultraviolet vapour generation of As(III), and their UVG efficiencies for volatile species of arsenic were investigated. 15 mg L(-1) of ferric chloride provided the greatest enhancement of approximately 10-fold, using 20% acetic acid combined with 4% formic acid with 30 s ultraviolet irradiation at 200 mL min(-1) Ar/H2 flow rate. Under the optimised conditions, the linear range was 1.0 μg L(-1)-100.0 μg L(-1), and the spiked recoveries were 92%-98%. The limit of detection was 0.05 μg L(-1) for iAs, and the relative standard deviation (RSD) value of the repeated measurements was 2.0% (n = 11). This method was successfully applied to the determination of ultratrace iAs in tap water, river water, and lake water samples using 0.2% H2SO4 (v : v) as the sample preserver. The obtained values for the water samples of certified reference materials (CRMs) including GSB-Z50004-200431, GBW08605 and GBW(E)080390 were all within the certified ranges.
authors.affiliation: Institute of Quality Standard and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, and Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China. ljx2117@gmail.com mxf08@163.com maoxuefei@caas.cn and Research Center for Analytical Sciences, Northeastern University, Shenyang 110819, China.
authors.forename: Yuelong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Research Center for Analytical Sciences, Northeastern University, Shenyang 110819, China.
authors.forename: Lingling
authors.initials: L
authors.lastname: Lin
authors.affiliation: Institute of Quality Standard and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, and Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China. ljx2117@gmail.com mxf08@163.com maoxuefei@caas.cn and Beijing Titan Instruments Company, Limited, Beijing 100015, China.
authors.forename: Jixin
authors.initials: J
authors.lastname: Liu
authors.affiliation: Institute of Quality Standard and Testing Technology for Agro-products, Chinese Academy of Agricultural Sciences, and Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China. ljx2117@gmail.com mxf08@163.com maoxuefei@caas.cn.
authors.forename: Xuefei
authors.initials: X
authors.lastname: Mao
authors.affiliation: Research Center for Analytical Sciences, Northeastern University, Shenyang 110819, China.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Wang
authors.affiliation: Beijing Titan Instruments Company, Limited, Beijing 100015, China.
authors.forename: Deyuan
authors.initials: D
authors.lastname: Qin