Author： Cherevko A.
Publisher： MAIK Nauka/Interperiodica
ISSN： 1061-9348
Source： Journal of Analytical Chemistry, Vol.66, Iss.7, 2011-07, pp. : 610-619
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
The mechanism of the evaporation and formation of an analytical signal upon the injection of an analyzed powder into the plasma jet of a two-jet argon arc plasmatron is studied. The strong dependence of the integral intensity of the spectral lines and the degree of particle evaporation on the dispersity of the introduced material is observed. The completeness of evaporation and the maximum intensity of the analytical signal are attained for particle sizes of the order 0.005-0.025 mm, depending on their structure, chemical composition, and the element to be determined. Larger particles leave the excitation zone being only partially evaporated, i.e., having lost only part of their weight. Different degrees of element atomization from particles of different sizes result in the appearance systematic errors of analysis. It is shown that fine grinding of the powders to the sizes ≤0.025 mm ensures the complete atomization of the impurity elements from the sample particles and ensures the accuracy of the results of analysis.
Related content
Access to resources
Recommend
