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Answer to Question #41111 in Other Chemistry for EDWARD TONE

Question #41111
Dear sir
i want to determine water (100 ppm)in condensate sample by karlfisher coulometry method but our sample have H2S concentration 600 ppmwt can interfere with karlfischer solution in ASTM E203 CORRECTION IS ONLY FOR MERCAPTAN can you guide me how can i?
best regards
EDWARD
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Assignment Expert
10.04.14, 12:50

Dear Edward!
If you proceed the titration of H2S carefully, you will have no excess of iodine in the solution. If you want to avoid the usage of iodine, you can remove the hydrogen sulfide using the silver salts in presence of weak base. In this method, you should add the silver salt carefully as well, because a large excess of silver salt affects the appearance of the potentiometric titration curve, making it difficult to determine the endpoint.

edward
08.04.14, 13:11

dear sir thank you for your reply but in sample with unkown H2S HOW CAN I ACCURATE IODINE?AND ADDITION OF IODINE INTERFERE WITH KARLFISCHER SOLUTION IN COULOMETRY AND CONSUME THE WATER ?IF I CAN DETERMIN H2S CONTENT CAN I CORRECTED RESULT OF WATER?

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