SULFUR DETERMINATION IN LIQUID PETROLEUM GASES (LPG): D2784
This test method is valid for sulfur levels of >1 μg/g of sulfur in liquefied petroleum gases (LPG). The samples should not contain more than 100 μg/g of chlorine. Stringent techniques must be employed and all possible sources of sulfur contamination must be eliminated to achieve the quantitative detectibility that this test method is capable of. In particular, cleaning agents, such as common household detergents, which contain sulfates, should be avoided.
TEST SUMMARY
The sample is burned in an oxy-hydrogen burner or in a lamp in a closed system in a carbon dioxide oxygen atmosphere.
The latter is not recommended for trace quantities of sulfur due to inordinately long combustion times needed. The sulfur oxides produced are absorbed and oxidized to sulfuric acid in a hydrogen peroxide solution. The sulfate ions are then determined by either titrating with barium perchlorate solution using a thorinmethylene blue mixed indicator, or by precipitating as barium sulfate and measuring the turbidity of the precipitate with a photometer.
TEST PRECISION
No data on either precision or bias of this test method are available.
