Abstract
Using solution technique, sulfur in the sulfide ore was indirectly determined by X-ray fluorescence spectrometry. The sample was dissolved with the mixed solution of B$r_2$ and HN$O_3$, and Si$O_2$, a major constituent, was repelled from the solution by HF treatment several times, B$a^{2+}$ solution was added to the solution to precipitate the S$O^4_{2-}$ ion as BaS$O_4$. Measuring the fluorescent X-ray intensity of excess Ba2+ ion in the filtrate, the content of sulfur in the original ore was back-calculated. Comparing the results by this method with the gravimetric method, the mean difference was ${\pm}1.7%$ in the range of 20 to 40% of sulfur content and the method was tolerably reproducible.
용액법을 이용하여 황화광석중 황을 X-선 형광분광법에 의하여 간접적으로 정량하였다. 시료를 B$r_2$와 HN$O_3$의 혼합용액으로 녹여서 황을 S$O^4_{2-}$상태로 산화시켰고 주성분인 Si$O_2$는 HF로 처리하여 날려 보냈다. 이 용액에 여분의 일정량 B$a^{2+}$용액을 가하여 BaS$O_4$로 침전시키고 거른 다음 거른액과 씻은액중의 Ba의 형광 X-선세기를 측정하여 역계산으로 황을 정량하였다. 무게분석법에 의한 결과와 비교하여 보면 함량 $20{\sim}40%$ 범위에서 ${\pm}1.7%$의 평균차이를 나타낸다. 정광시료의 표준편차는 0.69로서 좋은 재현성을 나타냈다.