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样品经硝酸-高氯酸消化溶解,高氯酸冒烟,盐酸溶解盐类后,在盐酸(5%)介质中,在选定的测定条件下,用电感耦合等离子体原子发射光谱(ICP-AES)法测定人发中微量元素铜、锌、铁、镁、钙。选择Cu 327.3、Zn 206.2、Fe 238.2、Mg 279.5、Ca 315.8nm分别作为铜、锌、铁、镁、钙的分析线与混合标准溶液同时测定;方法加标回收率为98.6%～101%,铜、锌、铁、镁、钙的精密度(RSD,n=8)为0.37%～2%,准确度(RE)为-3.4%～1.15%,检出限分别为0.002 3、0.001 6、0.004 6、0.003 0、0.001 4μg/mL。方法克服了分光光度法和原子吸收光谱法操作繁琐、周期长、成本高、灵敏度低等缺点。用于测定人发样品中的铜、锌、铁、镁、钙元素,测定结果与原子吸收光谱法测定值基本一致。经GBWO7061标准物质和自制标样分析验证,测定值与标准值吻合,结果准确可靠。
Samples were digested by nitric acid-perchloric acid, perchloric acid smoked, and dissolved in hydrochloric acid. The samples were analyzed by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP) with hydrochloric acid (5%) under the selected conditions. -AES) Determination of trace elements in human hair copper, zinc, iron, magnesium, calcium. The Cu 327.3, Zn 206.2, Fe 238.2, Mg 279.5 and Ca 315.8 nm were selected as the analytical line for the simultaneous determination of copper, zinc, iron, magnesium and calcium. The recoveries were 98.6% ~ 101% (RSD, n = 8) were 0.37% -2%, and the accuracy (RE) was -3.4% -1.15% .The detection limits were 0.002 3,0.001 6,0.004 6,0.003 0,0.001 4 μg / mL. The method overcomes the shortcomings of cumbersome operation, long period, high cost and low sensitivity by spectrophotometry and atomic absorption spectrometry. For the determination of human hair samples of copper, zinc, iron, magnesium and calcium, the measured results and atomic absorption spectrometry measured values are basically the same. The GBWO7061 standard material and homemade standard sample analysis and verification, the measured value is consistent with the standard value, the result is accurate and reliable.