PURPOSE: To exactly measure even a extremely slight quantity of SO2 and to prolong the life of an ion chromatograph by bringing the hydrogen peroxide remaining in an absorbing soln. into contact with a platinum catalyst to decompose and remove the same, then passing the absorbing soln. through the chromatograph.
CONSTITUTION: The hydrogen peroxide soln. absorbing the SO2 in the gas, i.e., the absorbing soln. is stored in an absorbing soln. tank 7 and is sucked by a pump 8 so as to be passed through a hydrogen peroxide decomposing column 9 in which the platinum catalyst is packed. The gaseous oxygen generated by the decomposition of the hydrogen peroxide is removed by an air trap 10 and thereafter, the absorbing soln. is passed through a concentration column 2 to concentrate the SO42- in the absorbing soln. Selector valves 11, 12 are selected to pass the eluate from an eluate tank 6 by a eluate pump 1 to the column 2 to eluate the SO42- adsorbed in the anion exchange resin in the column 2. The eluate is then passed successively through a sepn. column 3 and a removing column 4 and the SO42- is detected by a detector 5. Even the extremely slight quantity of the SO2 is thereby exactly measured and the life of the ion chromatograph is prolonged.
IWAI MASA
OTA KEIJI
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