原子吸收光谱法和重金属快速检测法测定大米中镉含量的比较

采用石墨炉原子吸收光谱法和重金属快速检测法分别测定大米样品中的镉含量。结果表明:两种方法测得大米的镉含量分别是0.287 8 mg/kg和0.288 6 mg/kg,相对误差(RE)分别为3.55%和3.28%,相对标准偏差(RSD)分别为10.71%和0.48%,两种方法测得大米镉含量结果无显著差异(P0.05),但重金属快速检测法精密度优于原子吸收光谱法。重金属快速检测法可同时适用于快速筛选和精确定量,预期在粮食重金属检测方面具有很好的应用前景。

Comparison of determinations of cadmium content in rice by graphite furnace atomic absorption spectrophotometry and rapid detection of heavy metals

Cadmium content in rice sample was determined by graphite furnace atomic absorption spectrometry and rapid detection of heavy metals method. The results showed that the cadmium content in rice were 0. 2878 mg/kg and 0. 2886 mg/kg, while relative error were 3. 55% and 3. 28%, relative standard deviation were 10.71% and 0. 48% respectively. There were no significant differences between the results of the two methods(P >0. 05), but the precision of rapid detection of heavy metals method was better than that of graphite furnace atomic absorption spectrometry, and can be used in rapid screening and accurate quantitative determination at the same time, which will have a good application prospect in detection of heavy metals in grain.