Evaluation of a new dielectric barrier discharge excitation source for the determination of arsenic with atomic emission spectrometry.
A low power dielectric barrier discharge excitation source was developed to determine arsenic in a cost-effective manner. Arsenic in water was reduced to AsH₃ by hydride generation (HG), which was transported to the miniature dielectric barrier discharge (DBD) excitation source for excitation and optical detection at As 193.7 nm atomic line. The DBD source consists of a quartz tube, a tungsten rod electrode, and a copper coil electrode. The main operation parameters and the potential interferences affecting the determination were investigated. The detection limit for arsenic with the proposed DBD-AES was 4.8 μg L(-1) when the HG products were dried with concentrated H₂SO₄ before introducing to DBD. Repeatability, expressed as the relative standard deviation of the spectral peak height, was 2.8% (n=11) for 0.1 mg L(-1) arsenic solution. The proposed method was successfully applied to the determinations of certified reference material (GBW08605) and nature water samples.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China. Electronic address: zhuzl03@gmail.com.
Zhenli
Z
Zhu
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
Haiyang
H
He
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
Dong
D
He
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
Hongtao
H
Zheng
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.
Caixiang
C
Zhang
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
Shenghong
S
Hu
D001151:Arsenic / Q000032:analysis*; D058266:Dielectric Spectroscopy / Q000379:methods / Q000592:standards*; D013054:Spectrophotometry, Atomic / Q000379:methods / Q000592:standards*
D001151:Arsenic
Arsenic; Dielectric barrier discharge; Hydride generation; Optical emission spectrometry