A method is described for the direct determination of iron in high purity sodium fluoride using graphite furnace atomic absorption spectrometry. Interferences caused by the matrix are investigated. It is shown that th...A method is described for the direct determination of iron in high purity sodium fluoride using graphite furnace atomic absorption spectrometry. Interferences caused by the matrix are investigated. It is shown that the ashing temperature can be increased to 1 400°C and matrix interferences eliminated, the sensitivity of iron increased in 1. 27 fold by the addition of nickel nitrate. The method is applied to the determination of iron in sodium fluoride and satisfactory results are obtained.展开更多
目的:建立石墨炉原子吸收分光光度法测定空心胶囊中有害元素铬的含量。方法:采用微波消解系统消解样品,以石墨炉原子吸收分光光度法检测空心胶囊中铬元素的含量。结果:线性范围为0~10.0 μg·L^(-1),二次回归方程相关系数 r 为0.99...目的:建立石墨炉原子吸收分光光度法测定空心胶囊中有害元素铬的含量。方法:采用微波消解系统消解样品,以石墨炉原子吸收分光光度法检测空心胶囊中铬元素的含量。结果:线性范围为0~10.0 μg·L^(-1),二次回归方程相关系数 r 为0.9998,方法的检出限为0.39 μg·L^(-1),定量限为1.84 μg·L^(-1),特征浓度(灵敏度)为0.0587 μg·L^(-1),平均回收率为98.9%(n=9)。结论:采用本法检测空心胶囊中铬元素的含量,方法灵敏、准确、可靠,对控制胶囊中铬元素的含量有实际意义。展开更多
文摘A method is described for the direct determination of iron in high purity sodium fluoride using graphite furnace atomic absorption spectrometry. Interferences caused by the matrix are investigated. It is shown that the ashing temperature can be increased to 1 400°C and matrix interferences eliminated, the sensitivity of iron increased in 1. 27 fold by the addition of nickel nitrate. The method is applied to the determination of iron in sodium fluoride and satisfactory results are obtained.