Related Experiment Video
Updated: Jun 28, 2026

Preparation of Functional Silica Using a Bioinspired Method
Published on: August 1, 2018
Flotation-photometric determination of silicon in the form of chromopyrazole II molybdosilicate
P G Kaz'min1, E N Dorokhova, I P Alimarin
1Department of Analytical Chemistry, Moscow State University, Moscow, USSR.
Abstract:
The process of concentrating chromopyrazole II alpha- and beta-molybdosilicates by flotation with mixtures of toluene with polar solvents (acetone, ethanol, isoamyl alcohol, cyclohexanol or cyclohexanone) has been studied. It was found that the composition of the complex depends on the acidity of the medium. The complex was isolated from 1.5M sulphuric acid. On the basis of elemental analysis the ratio of chromopyrazole II to molybdosilicate was found to be 2:1. Infrared spectroscopy was used to establish that an ion-association complex is formed. The results were used to establish a method for determination of ultratrace levels of silica (2 mug/l.) in high-purity water. The relative standard deviation is 7-11%.
Related Concept Videos
Silica Gel Column Chromatography: Overview
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
Flame Photometry: Lab

