摘要
建立氢化物发生-原子荧光光谱法(HG-AFS)测定铀钼矿钼反萃取液、净化液中砷含量的分析方法。仪器主要工作条件:负高压280 V,灯电流60 mA,原子化器高度9 mm,载气流量400 mL/min,屏蔽气流量1000 mL/min。砷的质量浓度在0～40μg/L范围内与荧光强度呈良好的线性,线性相关系数r=0.9998。方法测定砷的检出限为0.037μg/L,测定结果的相对标准偏差小于5%(n=6),加标回收率为90.5%～102.5%。针对溶液中的钼同多酸和杂多酸以及存在的其它氧化物,采取抗坏血酸-硫脲混合溶液进行预还原,溶液中铀含量约为0.1 g/L时,对砷的测定无影响。该法能满足铀钼矿钼反萃取液、净化液中砷含量0.005～4 g/L的测定要求。
Arsenic in the uranium molybdenum ore molybdenum reverse extract liquid, purify liquid was determined by hydride generation-atomic fluorescence spectrometric method. Instument main working conditions were as follows： negative high voltage 280 V, lamp current 60 mA, atomization device height 9 mm, the carrier gas flow rate 400 mL/min, the sheielding gas flow rate 1 000 mL/min. Arsenic mass concentration was linear with fluorescence intensity in the range of 0-40μg/L, r=0.999 8. Detection limit of As was 0.037 μg/mL, the relative standard deviation was less than 5%（n=6）, addtion recovery rate was 90.5%-102.5%. For solution of molybdenum with acid and heteropoly acid and other oxides exist, thiourea ascorbic acid mixed solution was taken for prereduction. The uranium did not affect the determination of arsenic as its content in the solution was about 0.1 g/L. The method can be used for determination of arsenic which content in the uranium molybdenum ore molybdenum reverse extract liquid, purify liquid is 0.005-4 g/L.
出处
《化学分析计量》
CAS
2013年第3期47-50,共4页
Chemical Analysis And Meterage
关键词
钼反萃取液
净化液
氢化物发生-原子荧光光谱法
砷
uranium molybdenum ore molybdenum reverse extract liquid, purify liquid
hydride generation-atomic fluorescence spectrometric
arsenic
