Determination of trace elements in liquid samples with organic matrix by arc atomic emission spectrometry
https://doi.org/10.26896/1028-6861-2022-88-1-II-63-68
Abstract
Conditions for the analysis of liquid samples on a MFS-8 spectrometer upgraded with a MAES photodiode array by arc atomic emission spectrometry with dry residue technique are specified. It is shown that optimization of the electrode shape along with the method of calculating the intensity of the spectral line and time of the base exposure leads to the expansion of the operating range of calibration curves. The arc plasma parameters (temperature and electron density) are similar when the spectra of dry residues of aqueous solutions, saliva, blood serum, and dry wine are excited. This provides direct (without digestion) determination of trace elements in these samples with the detection limits at a level of μg/liter. When a sample of vegetable oil is deposited on the electrode, it is likely to be absorbed in depth and does not enter the arc plasma in full, which makes the direct analysis impossible. Nevertheless, the determination of trace elements in oils by the dry residue technique is possible after acid digestion of the sample.
About the Authors
S. S. Savinov
Institute of Chemistry, St. Petersburg State University
Russian Federation
Russian Federation
Sergey S. Savinov
199034, St. Petersburg, Universitetskaya nab., 7/9
A. D. Titova
Institute of Chemistry, St. Petersburg State University; National Research Center Kurchatov Institute — «Prometey» Central Research Institute of Structural Materials
Russian Federation
Russian Federation
Anna D. Titova
199034, St. Petersburg, Universitetskaya nab., 7/9
191015, St. Petersburg, Shpalernaya ul., 49
N. A. Zverkov
Institute of Chemistry, St. Petersburg State University; ITMO University
Russian Federation
Russian Federation
Nikolai A. Zverkov
199034, St. Petersburg, Universitetskaya nab., 7/9
197101, St. Petersburg, Kronverksky prosp., 49
A. I. Drobyshev
Institute of Chemistry, St. Petersburg State University
Russian Federation
Russian Federation
Anatoly I. Drobyshev
199034, St. Petersburg, Universitetskaya nab., 7/9
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Review
For citations:
Savinov S.S., Titova A.D., Zverkov N.A., Drobyshev A.I. Determination of trace elements in liquid samples with organic matrix by arc atomic emission spectrometry. Industrial laboratory. Diagnostics of materials. 2022;88(1(II)):63-68. (In Russ.) https://doi.org/10.26896/1028-6861-2022-88-1-II-63-68
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