Rice cadmium monitoring using heat-extraction electrothermal atomic absorption spectrometry
Rice cadmium monitoring using heat-extraction electrothermal atomic absorption spectrometry
复制标题
热提取电热原子吸收光谱法监测大米镉
DOI：
10.1039/c4ja00234b
复制
发表时间：
2014-01-01
影响因子：
3.4
通讯作者：
Hu, Shenghong
中科院分区：
文献类型：
--
作者：
Guo, Wei;Zhang, Ping;Hu, Shenghong
A simple and high throughput method involving heat-extraction electrothermal atomic absorption spectrometry was developed to monitor the Cd content in rice, and 184 rice samples purchased from supermarkets in Beijing were surveyed. The main advantages of using heat-extraction in comparison to slurry sampling are doubling of the graphite tube lifetime and 80% decrease in the background absorbance signal, most likely because the less sample matrix was introduced into the atomizer, avoiding buildup of carbonaceous residues or silicates on the graphite platform. Heat-extraction provides better detection limits and precision than microwave acid digestion. In the heat-extraction method, slurries in 3% v/v HNO3 were heated on a heating block. After centrifugation, the supernatant was introduced into a graphite tube pretreated with a W-Rh permanent modifier. The optimum conditions for Cd detection were 0.2-5.0% m/v slurry concentration, 3% HNO3 extract, 10 min heating at 120 degrees C, rice-particle size
