Highly Selective and Sensitized Spectrophotometric Determination of Iron (III) Following Potentiometric Study

Annali di chimica Pub Date : 2007-07-16 DOI:10.1002/adic.200790067

Ardeshir Shokrollahi, Mehrorang Ghaedi, Hamid Reza Rajabi

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引用次数: 28

Abstract

A simple, selective and sensitized spectrophotometric method for determination of trace amounts of Fe³⁺ ion in tap and waste water solutions has been described. The spectrophotometric determination of Fe³⁺ ion using Ferron in the presence of N,N-Dodecytrimethylammonium bromide (DTAB) has been carried out. The Beer's law is obeyed over the concentration range of 0.05-2.6 μg mL^-1 of Fe³⁺ ion with the relative standard deviation (RSD %) <0.2 % and the molar absorptivity of complexes in pH 3.5 is 3.8×10³ L mol^-1 cm^-1.

Potentiometric pH titration has been used for prediction of protonation constants of ferron, and evaluating its stoichiometry and respective stability constant with Fe³⁺ ion. As it is obvious the most likely species of ferron alone and its complexes are LH (log=7.64), LH₂ (logK=10.52), LH₃ (logK=11.74) and ML₂ (logβ= 23.68), ML₃ (logβ= 23.68), ML₃H (logβ= 23.68), ML₃H₂ (logβ= 23.68) and ML(OH)₂ (logβ=23.68) respectively.

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高选择性和敏化分光光度法测定铁(III)电位法研究

介绍了一种简便、选择性、敏化的分光光度法测定自来水和废水中痕量铁离子的方法。用铁在N,N-十二烷基三甲基溴化铵(DTAB)存在下分光光度法测定了铁离子。Fe3+离子在0.05 ~ 2.6 μ mL-1浓度范围内符合Beer定律，相对标准偏差(RSD %) < 0.2%， pH为3.5时配合物的摩尔吸收率为3.8×103 L mol-1 cm-1。用电位pH滴定法预测了铁的质子化常数，并评价了铁的化学计量学和与Fe3+离子的稳定常数。很明显，铁离子及其配合物最可能存在LH (log=7.64)、LH2 (logK=10.52)、LH3 (logK=11.74)和ML2 (logβ=23.68)、ML3 (logβ=23.68)、ML3H (logβ=23.68)、ML3H2 (logβ=23.68)和ML(OH)2 (logβ=23.68)。

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Annali di chimica

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