微波消解-火焰原子吸收光谱法间接测定小麦粉中的滑石粉  

Indirect determination of talc powder in wheat flour by microwave digestion flame atomic absorption spectrometry

作　　者：罗叶丽 董梅 武鑫 强鑫 LUO Ye-li;DONG Mei;WU Xin;QIANG Xin(Weinan Inspection and Research Institute,Weinan 714000,Shaanxi,China;Fuping County Inspection and Testing Center(Shaanxi Sheep Milk Product Quality Supervision and Inspection Center),Fuping 711700,Shaanxi,China)

机构地区：[1]渭南市检验检测研究院,陕西渭南714000 [2]富平县检验检测中心(陕西省羊乳产品质量监督检验中心),陕西富平711700

出　　处：《粮食与油脂》2024年第4期150-152,157,共4页Cereals & Oils

基　　金：广西壮族自治区市场监督管理局科技计划项目(GXSJKJ2021-2);广西-东盟食品检验检测中心自立课题(KY202003)。

摘　　要：建立微波消解-火焰原子吸收光谱法测定小麦粉中滑石粉含量的方法。通过对消解系统酸用量和释放剂氯化锶加入量的优化,最终确定选用硝酸-氢氟酸体积比5∶1作为消解用酸,以每100 mL试样溶液中加入2.0 mL 15 g/L氯化锶溶液来达到消除干扰的目的,经过方法学验证,结果表明:在0.2~1.0 mg/L范围内线性良好,相关系数r为0.999354;在加入镁元素的含量分别为1153.8、2884.6、7692.3μg/g时,平均回收率分别为101.0%、102.0%和102.3%,方法的相对标准偏差为0.44%,检出限为0.0040 g/kg,定量限为0.0134 g/kg,实际样品测定结果满意。A method for determining the content of talc powder in wheat flour using microwave digestion flame atomic absorption spectrometry was established.By optimizing the amount of acid in the digestion system and the amount of releasing agent strontium chloride,nitric acid-hydrofluoric acid volume ratio of 5:1 was ultimately selected as the digestion acid,2.0 mL 15 g/L strontium chloride solution was added into 100 mL sample solution to achieve the purpose of eliminating interference.The methodological verification showed that the linearity was good in the range of 0.2-1.0 mg/L,and the correlation coefficient r was 0.999354.When magnesium content was 1153.8,2884.6,7692.3μg/g,the average recoveries was 101.0%,102.0% and 102.3%,respectively.The relative standard deviation was 0.44%,the detection limit was 0.0040 g/kg and the limit of quantification was 0.0134 g/kg.The results of practical samples were satisfactory.

关 键 词：微波消解 滑石粉 小麦粉 火焰原子吸收光谱法 

分 类 号：TS210.7[轻工技术与工程—粮食、油脂及植物蛋白工程]