Spectrophotometric determination of iridium after complexation and membrane filtration

A.S. Amin , I.A. Zaafarany
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引用次数: 4

Abstract

A simple, ultra sensitive and selective method for the spectrophotometric determination of Ir3+ in various synthetic and environmental samples was reported. The analyte ions were collected on a membrane filter in the form of their red complex with 5-(2-benzothiazolyl-azo)8-hydroxy-quinoline (BTAHQ), and the absorption spectra of the colored membrane filters were acquired. Effects of pH value, sample volume, and amount of BTAHQ were examined in order to optimize sensitivity. The interference by common other ions was eliminated using appropriate masking agents. The absorbance is linearly related to the concentration of Ir3+ in the ranges from 0.1 to 0.8 μg/L, and from 1.0 to 7.0 μg/L, respectively, the correlation coefficients (R2) being 0.9996 and 0.9994. The molar absorptivities were calculated to be 4.81 × 105 and 4.26 × 107 L mol−1 cm−1 at 563 nm, whereas Sandell sensitivity was found as 0.391 and 0.004 ng cm−2, respectively. The novelty and advantages of the proposed method is the highly sensitivity of the proposed method compared with all previously cited methods for iridium determination. Under the optimal conditions, the detection limit is 0.03 μg/L. The recoveries in case of spiked samples are between 98.7% and 101.5%, and the relative standard deviations range from 1.21% to 1.75%.

Abstract Image

络合膜滤后分光光度法测定铱
报道了一种简单、超灵敏、选择性强的分光光度法测定各种合成和环境样品中Ir3+的方法。分析物离子与5-(2-苯并噻唑偶氮)8-羟基喹啉(BTAHQ)以红色配合物的形式在膜过滤器上收集,并获得彩色膜过滤器的吸收光谱。考察了pH值、样品体积和BTAHQ用量的影响,以优化灵敏度。用适当的掩蔽剂消除了常见的其他离子的干扰。吸光度在0.1 ~ 0.8 μg/L和1.0 ~ 7.0 μg/L范围内与Ir3+浓度呈线性相关,相关系数(R2)分别为0.9996和0.9994。在563 nm处的摩尔吸光度分别为4.81 × 105和4.26 × 107 L mol−1 cm−1,而Sandell灵敏度分别为0.391和0.004 ng cm−2。该方法的新颖性和优点在于,与以往所有的铱测定方法相比,该方法具有很高的灵敏度。在最佳条件下,检出限为0.03 μg/L。加标回收率为98.7% ~ 101.5%,相对标准偏差为1.21% ~ 1.75%。
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