原子荧光光谱法测定饲料中的砷和镉

Determination of Arsenic and Cadmium in Feeds by Atomic Fluorescence Spectrometry

利用原子荧光光谱仪，采用氢化物发生一原子荧光法同时测定饲料中砷和镉。通过试验确定了仪器工作参数，砷的浓度在0～1000ng／ml，镉的浓度在0～50ng／ml时与荧光强度呈线性关系，相关系数分别为0．9999和0．9998。砷和镉的加标回收率分别为96．2％～102．7％和94．6％～107．4％。试样测定相对标准偏差分别为2．87％～3．65％和3．10％～3．57％。检出限分别为0．237μg/L和0．0161μg/L。

Arsenic and cadmium in feeds were determined by hydride generation-atomic fluorescence spectrometry. The apparatus parameters were determined after experiment. The concentration of arsenic and cadmium were linear with the fluorescence intensity in the range of 0 ～ 1 000 ng/ml and 0 ～ 50 ng/ml, the related coefficient were 0. 999 9 and 0. 999 8 respectively. The recoveries were 96.2% ～ 102.7% for arsenic and 94.6% ～ 107.4% for cadmium. The relative standard deviation of samples was 2.87% ～ 3.65% for arsenic and 3.10% ～ 3.57% for cadmium. The detection limits were 0. 237 μg/L for arsenic and 0. 016 1μg/L for cadmium.