硝酸反萃取火焰原子吸收光谱测定腺苷钴铵片中微量钴

Determination of Micro-amounts of Cobalt in Cobamamide Tablets by Nitric Acid Successive Extraction and Flame Atomic Absorption Spectrometry

研究了以1mol·L-1NH4SCN为介质，甲基异丁基甲酮（MIBK）萃取，4mol·L-1硝酸反萃取火焰原子吸收光谱水相测定微量钻的方法．钴量在0－5mg·L-1范围内呈良好的线性关系，检出限为0．070mg·L-1，相对标准偏差为1．17％．该方法适用于腺苷钴胺片中微量钻的测定．

Determination of micro -amounts of cobalt has been studied by methyl isobutyl ketone (MIBK) extraction procedure in 1 mol.L- 1 WSCN meditim folfowed by 4 mel' L-1 nitric acid successive extraction, and analysesed by flame atomic absorption spectrometry.The analytical calibration curve for cobalt shows execllent linearity in the rmge of 0 ~ 5 mg. L-1 with RSD of 1. 17%. The detection lindt is 0.070mg. L- 1. This metLhed is sugrsted for the detendnation of cohalt in cobnide Iablets.