采用HNO3-H2O2消解-电化学方法测定小米中的铬含量。在DTPA-HAc-Na Ac体系中铬（Ⅵ）离子在镀汞电极上形成汞齐从而得到氧化峰电流,考察能够满足电化学测定的前处理消解技术。结果表明,铬（Ⅵ）离子的消解液在温度130℃,硝酸10 m L,过...采用HNO3-H2O2消解-电化学方法测定小米中的铬含量。在DTPA-HAc-Na Ac体系中铬（Ⅵ）离子在镀汞电极上形成汞齐从而得到氧化峰电流,考察能够满足电化学测定的前处理消解技术。结果表明,铬（Ⅵ）离子的消解液在温度130℃,硝酸10 m L,过氧化氢38 m L,p H值呈中性时能够得到很好的电化学测定结果,线性相关系数为0.99,回收率为90%~110%。方法可以用于米中痕量铬（Ⅵ）的测定。展开更多
The paper reports the method applieable for determination of traces of mercury in 2.0mol·L -1 HCl 1.5 mol·L -1 NaCl 1.0μg·ml -1 Cd 2+ medium with differential pulse anoldic stripping voltammetry.Stripp...The paper reports the method applieable for determination of traces of mercury in 2.0mol·L -1 HCl 1.5 mol·L -1 NaCl 1.0μg·ml -1 Cd 2+ medium with differential pulse anoldic stripping voltammetry.Stripping peak and concentration of Hg is linear in range of 0.50～100ng·ml -1 when the deposition time is 5min.The relative standard deviation of 4.0ng·ml -1 Hg 2+ is 8.87% while n=8.After enrichment and separation of Hg in synthetic samples is obtained by using a microcolumn of sulfhydry cotton,the average recovery is about 80%.展开更多
文摘采用HNO3-H2O2消解-电化学方法测定小米中的铬含量。在DTPA-HAc-Na Ac体系中铬（Ⅵ）离子在镀汞电极上形成汞齐从而得到氧化峰电流,考察能够满足电化学测定的前处理消解技术。结果表明,铬（Ⅵ）离子的消解液在温度130℃,硝酸10 m L,过氧化氢38 m L,p H值呈中性时能够得到很好的电化学测定结果,线性相关系数为0.99,回收率为90%~110%。方法可以用于米中痕量铬（Ⅵ）的测定。
文摘The paper reports the method applieable for determination of traces of mercury in 2.0mol·L -1 HCl 1.5 mol·L -1 NaCl 1.0μg·ml -1 Cd 2+ medium with differential pulse anoldic stripping voltammetry.Stripping peak and concentration of Hg is linear in range of 0.50～100ng·ml -1 when the deposition time is 5min.The relative standard deviation of 4.0ng·ml -1 Hg 2+ is 8.87% while n=8.After enrichment and separation of Hg in synthetic samples is obtained by using a microcolumn of sulfhydry cotton,the average recovery is about 80%.
