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Determination of Trace Amounts of Lead Using the Flotation-spectrophotometric method. 使用浮选-分光光度法测定痕量铅。

Analytical chemistry insights

Pub Date : 2010-12-20 DOI: 10.4137/ACI.S5948

Sabah Shiri, Ali Delpisheh, Ali Haeri, Abdolhossein Poornajaf, Babak Golzadeh, Sina Shiri

The present study describes a simple and highly selective method for separation, preconcentration and spectrophotometric determination of extremely low concentrations of lead. It is based on flotation of a complex of Pb(2+) ions and Alizarin yellow between aqueous and n-hexane interface at pH = 6. The proposed procedure is also applied for determination of lead in both tap water and prepared sea water samples. Beer's Law was obeyed over the concentration range of 3.86 × 10(-8) To 8.20 × 10(-7) molL(-1) (8-170 ngmL(-1)) with an apparent molar absorptivity of 1.33 × 10(6) molL(-1) cm(-1) for a 100 mL aliquot of the water sample. The detection limit (n = 10) was 8.7 × 10(-9) molL(-1) (1.0 ngmL(-1)) and the Relative standard deviation (R.S.D), (n = 10) for 7.2 × 10(-7) molL(-1) (150 ngmL(-1)) of Pb (II) was 4.36%. A notable advantage of the method is that the determination of Pb (II) is free from the interference of almost all cations and ions found in the environment and waste water samples. The determination of Pb (II) in tap and synthetic seawater samples was also carried out by the present method. The results were satisfactorily comparable so that the applicability of the proposed method was confirmed to the real samples.

本研究介绍了一种分离、预浓缩和分光光度法测定极低浓度铅的简单而高选择性的方法。该方法基于 Pb(2+) 离子和茜素黄的复合物在 pH = 6 的水和正己烷界面之间的浮选。所提议的程序还可用于测定自来水和制备海水样品中的铅含量。在 3.86 × 10(-8) 至 8.20 × 10(-7) molL(-1) （8-170 ngmL(-1)）浓度范围内，100 mL 等分水样的表观摩尔吸收率为 1.33 × 10(6) molL(-1) cm(-1)，符合比尔定律。检测限（n = 10）为 8.7 × 10(-9) molL(-1) （1.0 ngmL(-1)），7.2 × 10(-7) molL(-1) （150 ngmL(-1)）铅 (II) 的相对标准偏差（R.S.D）（n = 10）为 4.36%。该方法的一个显著优点是测定 Pb (II) 不受环境和废水样品中几乎所有阳离子和离子的干扰。本方法还测定了自来水和合成海水样品中的铅 (II)。结果令人满意地具有可比性，从而证实了所建议的方法适用于实际样品。

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