浊点萃取-热喷雾火焰炉原子吸收光谱法测定荔枝和桂圆肉中痕量的Pb和Cd.pdf

浊点萃取-热喷雾火焰炉原子吸收光谱法测定 荔枝和桂圆肉中痕量的Pb 和Cd 1 2* 2 2 杨方文 ，曾楚杰 , 罗济文 , 周能 （1.四川化工职业技术学院制药与环境工程系，四川泸州 646005； 2.玉林师范学院化生系，广西玉林 537000 ） 摘 要: 为了测定荔枝和桂圆肉中的Pb 和Cd，采用浊点萃取-热喷雾火焰炉原子吸收光谱法 对该样品进行了分析。考查了二乙基二硫代氨基甲酸钠 （DDTC ）的浓度，溶液 pH 值、 TritonX-100 浓度、加热时间、水浴温度、干扰离子等实验条件对浊点萃取效率的影响。在 最优的实验条件下，该方法对Pb 和Cd 的富集倍数分别为30 和26 。方法的检出限对Pb 和 Cd 分别为2 ng mL-1 和0.1 ng mL-1，相对标准偏差分别为5.2%和3.6% 。利用该方法对荔枝 和桂圆中的铅和镉进行了测定，结果令人满意。 关键词: 浊点萃取; 热喷雾火焰炉原子吸收光谱法; 铅;镉; 二乙基二硫代氨基甲酸钠 Cloud point extraction coupled with thermospray flame furnace atomic absorption spectrometry for the determination of lead and cadmium in litchi and longan samples 1 2* 2 2 YANG Fang-Wen , ZENG Chu-Jie , LUO Ji-Wen , ZHOU Neng (1. Department of Pharmaceutical and Environmental Engineering, Sichuan College of Chemical Technology, Luzhou, 646005, China; 2. Department of Chemistry and Biology, Yulin Normal University, Yulin 537000, China) Abstract A sensitive method based on cloud point extraction (CPE) coupled with thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) was proposed for the determination of ultratrace lead and cadmium in litchi and longan samples. Some parameters that influence extraction and determination were evaluated in detail, such as concentration of sodium diethyldithiocarbamate (DDTC), pH of samples, concentration of TritonX-100, extraction time, as well as interferences. Under optimized conditions, enrichment factors of 30 and 26 could be -1 obtained for Pb and Cd respectively. The limits of detection of Pb a