Extraction Spectrophotometric Determination of Trace Amounts of Perchlorate Based on Ion-Pair Formation with Thionine

Abstract

A simple, rapid, and sensitive extraction-spectrophotometric method has been developed for the determination of trace amounts of perchlorate. This method is based on the extraction of perchlorate as an ion pair with thionine into isobuthyl methyl ketone and measuring the absorbance of the organic phase at 603 nm. The effect of different variables such as pH, reagent concentrations, and standing time was investigated and optimum conditions were established. The effects of other cations and anions on the extraction were also studied. The calibration curve was linear in the range of 40-1000 ng mL -1 with correlation coefficient of 0.9998. The detection limit based on 3S b criterion was 23 ng mL -1 and the relative standard deviation for 400 ng mL -1 of perchlorate was 1.9%. The proposed method was applied to determination of perchlorate in water samples.

Ion-selective electrodes using multi-walled carbon nanotubes as ion-to-electron transducers for the detection of perchlorate

“…They are noted for their high solubility, high solvation capacity and high reduction potential in water; properties which make perchlorate ions both chemically stable and a serious risk to human health. 1 During recent decades, different methods for determining perchlorate ions in water samples have been developed, including atomic absorption spectrometry, 2 spectrophotometry, 3,4 ion chromatography 5,6 and mass spectrometry. 7 However, electrochemical detection offers several advantages over these methods, such as ease of use, low cost, direct detection, miniaturisation and fast response times.…”

Adsorption of perchlorate from water using quaternary ammonium‐functionalized chitosan beads

“…Throughout this study, perchlorate concentration was analyzed using UV–visible spectroscopy by thionine chloride ion‐pair formation as reported in the literature . To confirm the consistency of this method, data are compared with the ion chromatogram data.…”

“…The left out concentration of perchlorate after removal process was analyzed using UV–visible spectrophotometer (Cary 60 UV–Vis, Agilent Technologies). A method developed by Pourreza and Mousavi based on ion‐pair formation with thionine is adopted for spectrophotometric analysis. In the literature, Balakrishnan et al adopted this method for the analysis of perchlorate.…”

Photometric redox determination of chlorine and bromine oxoanions in the hypochlorite disinfectants solutions

“…Альтернативой методу ИХ может являться спектро-фотометрия с применением избирательных и вы-сокочувствительных реагентов. Однако каждая из известных фотометрических методик предназна-чена для определения лишь одного-двух оксоани-онов, находящихся в смеси: гипохлорита или перх-лората с тионином [9,10], хлорита и (или) хлората с индигокармином [11,12], хлорита с бензидином [13], перхлората или бромата с фенотиазиновыми красителями [14,15]. Ранее [16] нами представлено теоретическое обоснование и исследована избирательность фо-тометрического определения оксоанионов хлора с применением редокс-индикаторов различных клас-сов, включая метиленовый голубой.…”