ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Study of the effect of sample preparation in spectrochemical analysis of magnesites

M. Herkeľová

Inst. Inorg. Chem., Slovak Acad. Sci., Bratislava

Abstract: A method for the spectrog. detn.of the most commonly occurring impurities in magnesite was developed by using model samples. The samples contained 0.1-3% SiO₂, Al₂O₃, and CaO and 0.2-6% Fe₂O₃; the content of MgO was 90%. The anal. was carried out in an a.c. arc with rapid sample evapn. from the crater of a C electrode. The sample was mixed with C powder contg. Co as ref. element (304.4 nm). The effect of the chem. compn. on the excitation process of magnesite was eliminated by dilg. the sample with C powder in the ratios 1:10 and 1:20. A sample-std.-C powder ratio of 4:1:20 gave the best results. Two sets of samples were used for the measurements, the first set of stds. contained unannealed samples, and the second contained samples annealed at 1600°C for 2 h prior to anal. Annealing of model samples improved anal. parameters only in the detn. of CaO.

Full paper in Portable Document Format: 312a223.pdf (in German)

Chemical Papers 31 (2) 223–230 (1977)