岩矿测试2011，Vol.30Issue(5)：545-549,5.
超声提取-氢化物发生-原子荧光光谱法测定水系沉积物中As(Ⅲ)和As(Ⅴ)
Determination of As ( Ⅲ ) and As ( Ⅴ ) in Stream Sediments by Hydride Generation-Atomic Fluorescence Spectrometry with Ultrasonic Extraction
摘要
Abstract
An analysis method was established for the determination of As( Ⅲ ) and total arsenic in stream sediments by Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS) by using 4. 8 mol/L HC1 for ultrasonic extraction at 50℃. The amount of As( Ⅴ ) could be obtained by substracting As( Ⅲ ) from total arsenic. The masking effects of citric acid, sodium citrate, oxalic acid, sodium oxalate, tartaric acid and sodium tartrate on As(Ⅴ) were investigated, then As( Ⅲ ) was determined by controlling suitable acidity of medium. The results showed that the best masking effect on As ( Ⅴ ) is sodium citrate. Moreover, As( Ⅲ ) is of higher sensitivity in the medium of sodium citrate. The optimum determination results could be achieved under the condition of ultrasonic extraction for 30 min, sodium citrate for 6 g/L and determination acidity for 0. 24 mol/L. Meanwhile, the signal interference of As ( Ⅲ) on As ( Ⅴ ) can be greatly reduced. The detection limit is 0.41 μg/L and the relative standard deviation level is 1. 33% (n = 11 ). The linear range of the calibration curve is 1.5 -500 μg/L. The recoveries of As( Ⅲ ) and As( Ⅴ ) are 82. 7% -95. 3% and 96. 1% -107.6% , respectively. The method is simple, rapid, highly accurate and of low cost. It has been applied to determine the As( Ⅲ ) and As( Ⅴ ) in stream sediment samples with satisfactory results which meet the requirements of multiple geological sample analysis.关键词
超声提取/As(Ⅲ)/As(Ⅴ)/柠檬酸钠/氢化物发生-原子荧光光谱法/水系沉积物Key words
ultrasonic extraction/As ( Ⅲ )/As ( Ⅴ )/sodium citrate/hydride generation-atomic fluorescence spectrometry (HG-AFS)/stream sediments引用本文复制引用
肖芳,汤志勇,郝志红,帅琴,郑洪涛,邱海鸥..超声提取-氢化物发生-原子荧光光谱法测定水系沉积物中As(Ⅲ)和As(Ⅴ)[J].岩矿测试,2011,30(5):545-549,5.基金项目
国土资源地质大调查项目(1212011120277) （1212011120277）
