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首页> 外文期刊>International journal of PIXE >QUANTITATIVE ANALYSIS FOR Cr(III) AND Cr(VI) IONS IN ENVIRONMENTAL WATER SAMPLES BY USING PIXE
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QUANTITATIVE ANALYSIS FOR Cr(III) AND Cr(VI) IONS IN ENVIRONMENTAL WATER SAMPLES BY USING PIXE

机译：用PIXE定量分析环境水样中的Cr（III）和Cr（VI）离子

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摘要

An enhanced sample preparation method for PIXE analysis is described allowing to separate and concentrate chromium ions of different valence in water samples. Cr3* ions are selectively adsorbed by ferric hydroxide colloids generated in the solution, and a PIXE target for analyzing the total concentration of chromium of hexavalent and trivalent states is prepared by depositing 0.15 ml of sample solution on a user-made thin polycarbonate film. PIXE analyses for the two kinds of targets reveal the fractions of chromium of different oxidation state. The standard method for collecting the colloids adsorbing Cr3* ions on Nuclepore filter of 0.2 um pores is based on an investigation of the pH-dependence of the recovery of dissolved Cr3* ions and the calibration curve is measured. The prepared targets were examined for 5 to 10 minutes by 3 MeV proton beams (0.7-5 nA beam currents). The lower detection limit of chromium in a 25 ml aquatic sample is 1 ppb for the Cr^-precipitated targets and 3.4 ppb for the CrfV-deposit targets based on the 3a error of background counts integrated over the FWHM of chromium peak in the PIXE spectrum. The applicability of PIXE using these sample-preparation techniques for determining chromium oxidation states was confirmed using river water samples to which Cr3* and CriV' ions were added in 50 ppb concentrations.
机译：描述了一种用于PIXE分析的增强的样品制备方法，该方法可以分离和浓缩水样品中不同价的铬离子。 Cr3 *离子被溶液中生成的氢氧化铁胶体选择性吸附，通过将0.15 ml样品溶液沉积在用户自制的聚碳酸酯薄膜上制备用于分析六价和三价态铬总浓度的PIXE靶。两种目标的PIXE分析显示了不同氧化态的铬部分。在0.2μm孔的Nuclepore过滤器上收集吸附Cr3 *离子的胶体的标准方法是基于对溶解的Cr3 *离子回收率的pH依赖性的研究，并测量校准曲线。用3 MeV质子束（0.7-5 nA束电流）检查准备好的目标5到10分钟。根据PIXE光谱中铬峰半峰宽所累积的背景计数的3a误差，在25 ml水生样品中，对于Cr ^沉淀的目标，铬的下限为1 ppb，对于CrfV沉积的目标为3.4 ppb。 。使用添加了50 ppb浓度的Cr3 *和CriV'离子的河水样品，证实了使用这些样品制备技术测定铬氧化态的PIXE的适用性。

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