Floatation-Spectrophotometric Determination of Thorium, Using Complex Formation with Eriochrome Cyanine R

Abstract

A novel and sensitive floatation-spectrophotometric method is presented for determination of trace amounts of thorium in water samples. The method is based on the ion-associated formation between thorium, Eriochrome cyanine R and Brij-35 at pH = 4 media. The complex was floated in the interface of the aqueous phase and n-hexane by vigorous shaking. After removing the aqueous phase the floated particles were dissolved in methanol and the absorbance was measured at 607 nm. The influence of different important parameters such as Eriochrome cyanine R and surfactants concentration, pH, volume of n-hexane, standing time and interfering ions were evaluated. Under optimized conditions the calibration graph was linear in the range of 6–230 ng mL−1 of thorium with a correlation coefficient of 0.9985. The limit of detections (LOD), based on signal to noise ratio (S/N) of 3 was 1.7 ng mL−1. The relative standard deviations for determination of 150 and 30 ng ml−1 of thorium were 3.26 and 4.41%, respectively (n = 10). The method showed a good linearity, recoveries, as well as some advantages such as sensitivity, simplicity, affordability and a high feasibility. The method was successfully applied to determine thorium in different water and urine samples.

Solvent extraction of Thorium(IV) from chloride acidic solution using Schiff base

“…Extensive efforts were recently focused on the extraction of thorium ions from its sources, some of the commonly employed separation methods; which precipitation (Armarego and Perrin, 2000), electrophoresis (Yekta, et al, 2014), electrodialysis (Mohammadi, et al, 2005), chromatography (Sharma and Sharma, 2007;Pathak and Argekar, 1992), flotation (Shiri, et al, 2011), ion exchange separation (Chen, etal., 2016;Metwally, et al, 2005) and solvent extraction (Patkar, et al, 2007) were studied. However, solvent extraction method has some advantages that are large capacity, simple equipment, quick and safe operation and low cost.…”

Metal Complexes Containing Natural and Artificial Radioactive Elements and Their Applications

“…The interest on their metal complexes has been motivated by the extended use of Tc, available in kilogram amounts, for medical and technical purposes. Meanwhile, actinides are important on their own for the nuclear industry and extraction and analytical applications [11,12,13]. They are also used for isotope separation, as antibacterial materials, drug delivery and anticancer radiopharmaceuticals, for the creation of labeled biomolecules, and radiation-induced processes.…”