Abstract：The low alloy steel sample could be combusted and released completely after addition of tungsten-tin flux. The crucible after analysis of low alloy steel sample was smoother and the splashing was less than that of pig iron sample. Moreover, the cost of secondary crucible was lower. Therefore, the crucible after analysis of low alloy steel sample was selected as secondary crucible for analysis of carbon and sulfur in ferrophosphorus. After 0.40-0.55 g of sample and 1.2-1.3 g of tungsten-tin flux were added into secondary crucible, a simultaneous determination of carbon and sulfur in ferrophosphorus by high-frequency combustion infrared absorption method could be realized without blank correction. There were only few certified reference materials of ferrophosphorus, which could not cover the content range of carbon or sulfur in all ferrophosphorus samples.As a result, the calibration sample series were prepared by mixing certified reference materials of low alloy steel and ferrophosphorus ZBT384 with total mass in range of (0.5±0.05)g. The results indicated that the linear relationship of calibration curves was good for carbon with mass fraction in range of 0.05%-0.65% and sulfur with mass fraction in range of 0.005%-0.14%. The correlation coefficient was 0.999 6 and 0.999 5 for carbon and sulfur, respectively. The proposed method was applied to the analysis of ferrophosphorus actual sample. The relative standard deviation (RSD, n=7) was 2.0% and 3.5% for carbon and sulfur, respectively. The certified reference material and internal control sample of ferrophosphorus were determined according to the experimental method. The absolute errors between the found results and the certified or reference values were less than the allowance difference in national standard method YB/T 5339-2015 or YB/T 5341-2015.
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DENG Jun-hua, WANG Yi-ling, KANG De-hua, WANG Ying, LI Dong-yang. Determination of carbon and sulfur in ferrophosphorus by high frequency combustion infrared absorption method. , 2017, 37(3): 83-87.
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