食用明胶中微量铬含量测定的方法研究  

The Research on Determination of Trace Chromium in Edible Gelatin

作　　者：昝川南 ZAN Chuan-nan(Guangxi-ASEAN Center For Food and Drug Safety Control,Nanning 530021,Guangxi,China)

机构地区：[1]广西-东盟食品药品安全检验检测中心,广西南宁530021

出　　处：《食品研究与开发》2019年第5期197-202,共6页Food Research and Development

摘　　要：为优化食用明胶中微量铬测定方法,通过微波消解,湿法消解,干法灰化等3种前处理方法,采取原子吸收-石墨炉法和电感耦合等离子质谱法测定明胶中铬含量。结果表明,食用明胶经硝酸-双氧水消解体系进行微波密闭消解,采用原子吸收-石墨炉法测定其微量铬,铬在0～16 ng/mL浓度范围内线性关系良好,相关系数r^2=0.999 1,方法检出限为0.01 mg/kg,加标平均回收率98.7%,相对标准偏差1.7%(n=7),质控样测定结果接近其中值。In order to find a better method for determination of trace chromium in edible gelatin,the content of chromium in gelatin was determined by atomic absorption-graphite furnace method and inductively coupled plasma mass spectrometry through microwave digestion,wet digestion and dry ashing.The results showed that edible gelatin was digested with nitric acid and hydrogen peroxide in a microwave sealed digestion system,and the trace chromium was determined by graphite furnace atomic absorptionspectrometry method.the linear relationship of chromium was good in the concentration range of 0-16 ng/ml,the correlation coefficient r2=0.999 1,its detection limit was 0.01 mg/kg,its average recovery rate was 98.7%,and RSD value was 1.7%(n=7),the results of quality control material was close to the median.

关 键 词：食用明胶 微量铬 原子吸收-石墨炉 电感耦合等离子质谱 质控样 

分 类 号：TS202.3[轻工技术与工程—食品科学]