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    轴向观测电感耦合等离子体原子发射光谱法测定天然纺织纤维中24种元素

    Axially Viewed ICP-AES Determination of 24 Elements in Natural Textile Fibre

    • 摘要: 应用轴向观测电感耦合等离子体原子发射光谱法测定了天然纺织纤维中24种元素的含量。称取样品0.5 g,用硝酸8 mL在程序升温(150 ℃~200 ℃)的条件下微波消解40 min,所得溶液用7 mol·L-1硝酸溶液定容至25 mL后分析。选用棉纤维标准物质IAEA-V-9按上述方法处理作为质控样品。所选择的仪器工作条件:① 雾化气流量0.8 L·min-1;② 射频功率1 250 W;③ 手动进样读数时间60 s。结果表明:24种元素的检出限(3s)在0.3~59.7 μg·L-1之间。各元素在10.0 mg·L-1范围内呈线性。样品经微波消解未引起被测元素的损失。用此方法分析了IAEA-V-9标准物质,所测14种元素的测定值(n=11)与认定值之间的相对误差在-38.8%~49.6%之间。

       

      Abstract: Axially viewed ICP-AES was applied to the determination of 24 elements in natural textile fibre. The sample (0.5 g) was taken and digested in a microwave digestor with 8 mL of HNO3 under the temperature elevation program from 150 ℃ to 200 ℃ for a total of 40 min. The digested solution was made up to a volume of 25 mL with 7 mol·L-1 HNO3 solution, and used for ICP-AES analysis. A CRM of cotton fibre (IAEA-V-9) was treated in the same way as the sample and used as a quality-control sample. Working conditions of the instrument were chosen as follows: ① flow-rate of nebulizer gas: 0.8 L·min-1; ② RF power: 1 250 W; and ③ time interval of reading with manual sample injection: 60 s. It was found that: values of detection limits (3s) for the 24 elements were found in the range of 0.3 to 59.7 μg·L-1; linearity ranges were kept within 10.0 mg·L-1 for each of the elements; no loss of analytic elements was observed during the process of microwave assisted sample digestion; in the analysis of the CRM IAEA-V-9 by this method, values of relative error (n=11) of 14 elements determined found were ranged from -38.8% to 49.6%.

       

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