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Preconcentration of Trace Arsenite and Arsenate with Titanium Dioxide Nanoparticles and Subsequent Determination by Silver Diethyldithiocarbamate Spectrophotometric Method
Author(s) -
Xiao Yabing,
Ling Jie,
Qian Shahua,
Lin Anqing,
Zheng Wenjie,
Xu Weiya,
Luo Yuxuan,
Zhang Man
Publication year - 2007
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143007x183998
Subject(s) - arsenite , arsenate , arsenic , chemistry , detection limit , adsorption , titanium dioxide , desorption , calibration curve , chromatography , nuclear chemistry , materials science , metallurgy , organic chemistry
A novel method of preconcentration of trace arsenite and arsenate by using titanium dioxide nanoparticles as adsorbent was described. The concentrations of preconcentrated arsenite and arsenate were determined by a silver diethyldithiocarbamate spectrophotometric method without desorption. Batch adsorption experiments were carried out as a function of the pH, contact time, amount of titanium dioxide nanoparticles, and solution volume. In the pH range 5 to 6, adsorption rates of arsenite and arsenate were higher than 98%. The calibration coefficient was 0.9991, and the linear range was 0 to 100 μg/L. The developed method was precise, with the relative standard deviation <5% at concentration level of 10 μg/L, with a detection limit (3σ, n = 6) of 0.44 μg/L. The accuracy of the method for total arsenic was validated by standard reference materials (SRM 3103a) (National Institute of Standards and Technology, Gaithersburg, Maryland). The method was also applied to the analysis of arsenite and arsenate in natural water samples to verify the accuracy. The recovery values remained in a narrow range, from 95 to 103%.