石墨炉原子吸收光谱法测定环境空气中钴

采用超细玻璃纤维滤膜采集环境空气中钴,硝酸-过氧化氢-氢氟酸混合进行消解,采用硝酸镁和硝酸混合液作为基体改进剂,石墨炉原子吸收光谱法测定环境空气中钴。此方法对测定环境空气中钴的灵敏度、准确度都有很大的提高,方法的最低检出浓度为0.25μg/L,当采样体积为100 L,钴最低检出质量浓度为0.000 1 mg/m3。对实际样品进行分析,钴的加标回收率为91.0%~106.5%。

Graphite Furnace Atomic Absorption Spectrometric Method for the Determination of Cobalt in Environmental Air

We adopt superfine glass fiber filtration film collection in ambient air of cobalt,and nitrate — hydrogen peroxide — hydrofluoric acid mixture for digestion of membrane and use magnesium nitrate and nitric acid as a mixture of matrix modifier to determine cobalt in environmental air by using graphite furnace atomic absorption spectrometric method. The method of determination of cobalt in environmental air has improved its sensitivity and accuracy. The detection limit is 0. 25 μ g / L,when the sample size is 100L,and the minimum detectable concentration 0. 000 1 mg / m3 cobalt. On the analysis of real samples,the spiked recovery of cobalt is 91% ~ 106. 5%.