[Determination of total sulfur in coal by ion chromatography].
OBJECTIVE
To develop a method for determination of total sulfur in coal by ion chromatography.


METHODS
To pretreat the coal by high-temperature combustion with oxygen-flow in tube furnace, and the sulfur with any from in coal was oxidated and converted into oxid of sulfur, which became sulfate after oxidated by H2O2 absorption solution. The separation of sulfate was achieved on DionexAS12A anion exchange column with a carbonate eluent, and the detection is performed by the suppressed conductivity detector with the injection volume of 50 microl. The total sulfur in coals were obtained from the determined results.


RESULTS
The method had been compared with the National Standard Method "High-Temperature Combustion--Neutralization Method for Determination of Total Sulfur in Coal (GB/T214-1996)", and the RSD of the method was less than 2% . This method had good relativity of the linearity (r = 0.9998) at the range of 0 to approximately 15 microg/ml for sulfate. Two kinds of national certified reference materials (GBW11104c and GBWl1110d) were determined, and the RSD were 1.92% and 0.47% respectively.


CONCLUSIONS
Ion chromatography for determination of total sulfur in coal has simple operation, high accuracy, and fast analysis, and can be applied in determination of total sulfur in coal.
Li
Shu-min
SM
Institute for Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
Ying
Bo
B
Yue
Yin-ling
YL
Jing
Kuan
K
D000397:Air Pollution / Q000517:prevention & control*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D003031:Coal / Q000032:analysis*; D013455:Sulfur / Q000032:analysis*
D003031:Coal; D013455:Sulfur