IC Determination of Chloride and Sulfur in Plants with Sample Treatment by Oxygen Bomb Combustion

The plant sample was combusted in oxygen bomb, and the HCl and SO3 evolved were absorbed in a mixed solution of 0.08 mol·L-1 Na2CO3, 0.01 mol·L-1 NaHCO3 and H2O2. The contents of chloride and sulfur in absorption solution were determined by IC. Ionpac AS14A (4 mm×250 mm) column was used as ion exchange column, and a mixture of 0.008 mol·L-1 Na2CO3 and 0.001 mol·L-1 NaHCO3 was used as eluent. Values of detection limits (3S/N) of the method found were 0.04 mg·L-1 for S and 0.02 mg·L-1 for Cl. The proposed method has been used in the analysis of the standard samples of rice (GSB-1S), soybean (GSB-4S), spinach (GSB-6S) and cabbage (GSB-5S), the results obtained were in conformity with their certified values. Values of RSD′s (n=5) and recovery found were 4.2%, 97.0% for S and 3.1%, 93.8% for Cl respectively.