氢化物发生原子荧光法测定硅藻土中砷

• 作 者: 边疆 张丽薇 张冠英 马莹 杨明远 李青 刘思洁 郭淑英
• 机 构: 吉林省疾病预防控制中心,吉林医药学院,
• 出 处: 中国卫生检验杂志
• 发表日期: 2010年01期
• 关键词: 预还原剂 原子荧光光谱 最佳测定条件 标准储备液 原子化器 仪器工作条件 特种空心阴极灯 相关系数 线性范围 砷含量

目的:为了建立硅藻土中砷的原子荧光光谱测定方法。方法:样品经处理,使用硫脲-抗坏血酸-碘化钾混合溶液作为预还原剂,研究了硅藻土中砷的原子荧光光谱测定方法的最佳测定条件。结果:本法选择20 g/L KBH4溶液作为还原剂,50 g/L硫脲-50 g/L抗坏血酸-50 g/L碘化钾混合溶液作为预还原剂,线性范围为0~10μg/L,相关系数r≥0.9999,检出限为0.026μg/L,加标回收率为92.3%~109.3%%,相对标准偏差为3.67%。结论:该方法简便快速、灵敏度高、准确度好,适合硅藻土中砷的测定。

Objective: To establish a method for the determination of arsenic in diatomite by atomic fluorescence spectrometry. Methods: The sample was treated with thiourea - ascorbic acid - potassium iodide mixed solution as a prereducing agent to study the optimal determination of arsenic in diatomite by atomic fluorescence spectrometry. Results: The method selected 20 g / L KBH4 solution as a reducing agent, 50 g / L thiourea-50 g / L ascorbic acid-50 g / L potassium iodide mixed solution as pre-reducing agent, the linear range of 0 ~ 10μg / L, The coefficient r≥0.9999, the detection limit was 0.026μg / L, the spiked recoveries ranged from 92.3% to 109.3%, and the relative standard deviations were 3.67%. Conclusion: The method is simple, rapid, sensitive and accurate. It is suitable for the determination of arsenic in diatomite.