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Trace Level Determination of Lead(II) in Water by Colorimetric-Solid Phase Extraction

机译：用比色实相萃取测定水中铅（II）的痕量测定

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摘要

Preliminary results on the development of quick, simple analytical method for the low level of lead(II) in water samples are described. The method concentrates lead(II) on a small solid-phase extraction disk, which is then quantified directly on the disk by diffuse reflectance spectroscopy (DRS). This method, termed colorimetric solid-phase extraction (C-SPE), requires only 1-2 min for complete workup and is suitable for use in a wide range of applications, including the microgravity environment on the International Space Station. The procedure first adds an excess of potassium iodide to a 10.0 mL sample at a pH of 3.0-3.5 to produce the anionic (PbI{sub}4){sup}(2-) colored complex, which is exhaustively extracted by the disk that was previously impregnated with cetylpyridinium chloride (CPC). The amount of complex extracted is then determined at 420 nm by a handheld DRS instrument. A linear calibration plot was obtained for lead(II) concentrations from 0.02-2.50 ppm, with a detection limit of 0.010 ppm. Results from interference tests using Ni(II), Cd(II), Zn(II), Cu(II), and Hg(II) yielded deviations of ±10%.
机译：描述了对水样中的低水平铅（II）的快速，简单分析方法的开发初步结果。该方法将铅（II）浓缩在小固相提取盘上，然后通过漫反射光谱（DRS）直接在盘上定量。该方法称为比色实相萃取（C-SPE），只需要1-2分钟以进行完成处理，适用于各种应用，包括国际空间站上的微匍匐环境。该方法首先将过量的碘化钾加入到10.0ml样品中，在pH为3.0-3.5，以产生阴离子（PBI {sub} 4）{sup}（2-）彩色复合物，其被磁盘彻底提取以前浸渍氯化甲苯吡啶（CPC）。然后通过手持式DRS仪器在420nm处测定复合物的量。得到线性校准图，用于铅（II）浓度为0.02-2.50ppm，检测限为0.010ppm。使用Ni（II），CD（II），Zn（II），Cu（II）和Hg（II）的干扰试验产生偏差为±10％。

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