绿色食品产地土壤中总砷的测定

文章采用硝酸-盐酸混合试剂热消解,氢化物发生原子荧光法-定绿色食品产地土壤中总砷.方法的检出限为0.0107mg/kg,相对标准偏差为1.4%,加标回收率为97.8%～102%之间.     

流动注射氢化物发生原子荧光光谱法同时测定海水养殖基地环境介质中As和Hg

应用氢化物发生原子荧光光谱技术,同时测定海水养殖基地环境介质底泥、海水和水产品中微量As和Hg。研究了载流、KBH4浓度对As和Hg测定的影响。在最佳实验操作条件下,As和Hg检出限分别为0.028 3μg/L、0.017 4μg/L。底泥中As和Hg的加标回收率分别为89.7%～112.6%和91.7%～110.8%,相对标准偏差分别为2.7%～5.3%和2.2%～4.3%;海水中As和Hg的加标回收率分别为90.2%～101.8%和90.0%～108.8%,相对标准偏差分别为3.1%～5.6%和2.1%～4.5%;水产品中As和Hg的加标回收率分别为89.6%～102.0%和89.2.0%～108.0%,相对标准偏差分别为2.6%～4.9%和1.7%～4.4%。     

Antimony uptake by <Emphasis Type="Italic">Zea mays</Emphasis> (L.) and <Emphasis Type="Italic">Helianthus annuus</Emphasis> (L.) from nutrient solution

We investigated the extent of Sb uptake by maize (Zea mays) and sunflower (Helianthus annuus) from nutrient solutions containing concentrations from 3 to 24 mg/L of potassium antimonate, with the aim of determining the potential of Sb to enter the food chain. The maximum shoot Sb concentrations in Z. mays and H. annuus were 41 mg/kg and 77 mg/kg dry weight, respectively. There was no significant difference in Sb uptake between species. The average bioaccumulation coefficients (the plant/solution concentration quotients) were 1.02 and 1.93 for Z. mays and H. annuus, respectively. Phosphate addition did not affect plant growth or Sb uptake. Antimony uptake by both Z. mays and H. annuus is unlikely to pose a health risk to animals and humans.     

原子荧光法测定污泥中总汞的不确定度评定

对王水消解-原子荧光法测定污泥中总汞的不确定度进行评定,从测定过程和计算方法的角度,对样品称量、曲线拟合、样品消解、稀释、仪器测量重复性及污泥含水率等影响不确定度的分量进行分析。结果表明：影响原子荧光法测定污泥中总汞的不确定度的主要因素是工作曲线的非线性和样品消解过程造成的损失,其次是样品消解液的稀释和仪器重复测定,而样品称量与污泥含水率的影响较小,可忽略不计。     

高效液相色谱-原子荧光联用测定天然水中烷基汞

应用在线紫外光照射-高效液相色谱分离-冷原子蒸发/氢化物发生-原子荧光光谱法(HPLC-UV-CV/HG-AFS)测定天然水中烷基汞,实验比较两种前处理方法-巯基棉富集和液液萃取,优化分析条件,建立一种简便、选择性好、高灵敏度分析天然水中烷基汞的方法.取1L水样时,甲基汞和乙基汞的检出限(3S/N)分别为0.3和0.6...     

Comparison of masking agents for antimony speciation analysis using hydride generation atomic fluorescence spectrometry

A sensitive atomic spectrometric method for the redox speciation analysis of Sb in water is described. The proposed method is based on the selective generation of stibine from Sb(III) in a continuous flow system using non-dispersive atomic fluorescence spectrometry for detection. The effects of the HCl concentration on the fluorescence intensities of Sb(III) and Sb(V) were investigated. The results indicated that atomic fluorescence emission due to Sb(V) can constructively interfere with the determination of Sb(III). For the determination of Sb(III), four compounds were tested as masking agents to inhibit the generation of stibine from Sb(V). The effects of the concentrations of the masking agents and of HCl on the fluorescence signals from Sb(III) and Sb(V) were studied. The results indicated that citric acid and NaF can successfully suppress hydride generation from Sb(V). To evaluate the developed methodology and the influence of the matrix, the recovery of Sb(III) from natural water that was spiked with different Sb(III) and Sb(V) concentrations was tested.     

氢化物发生原子荧光光度法分析空气中铅

为提高空气中铅分析的灵敏度,采用氢化物发生原子荧光分析方法进行空气中铅的测量.分别采用微波加热方法和湿式消解法对样 品进行了预处理,对两种消解方法进行了比较,并探讨了样品前处理过程对分析的影响;对影响氢化物发生效率的各种实验条件,包括增敏剂、酸介质及氢化物发生体系中各物质浓度等,以及原子荧光分析仪器的条件参数进行了优化...