Determination of the dissolved forms of silicon in natural drinking water using high-resolution continuum-source electrothermal atomic absorption spectrometry

Abstract

A technique for the determination of dissolved forms of silicon in water using high-resolution continuum-source electrothermal atomic absorption spectrometry (HR-CS-ETAAS) is proposed. The quantitative determination of the dissolved forms of silicon was performed using an atomic absorption spectrometer ContrAA 700 with a graphite cross-heating cuvette. Natural water was selected to optimize the temperature-time program of the atomizer. To eliminate chemical interference during the silicon determination by HR-CS-ETAAS, the graphite cuvettes were modified with a permanent modifier to form a carbide coating. A solution of sodium tungstate was used as a permanent modifier. Thermal stabilization of silicon in a graphite furnace was achieved with a mixed palladium-magnesium modifier present in the nitrate form. The developed method was used for determination of the content of the dissolved forms of silicon in water. The developed technique was certified proceeding from the results of the research and the metrological examination by an organization accredited for this type of the activity and registered in Federal information Fund for ensuring the uniformity of measurements (FIF).