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Avantor Sciences

Dechlorination of Treated Water using SO2 Containing Compounds

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Question How do I calculate the amount of chemical required for dechlorination?
Answer Sulfur dioxide containing compounds, such as sodium metabisulfite, sodium bisulfite, and sodium thiosulfate are effective dechlorinating agents. The following table lists the amount of dechlorinating agent required per part of chlorine to be removed.
Dechlorinating    Chemical    Parts required per part chlorine removed
Agent    Formula    pH 4.0    pH 6.5    pH 9.0    pH 11.0
Sodium Metabisulfite    Na2S2O5    1.47    1.47    1.47    1.47
Sodium Bisulfite    NaHSO3    1.61    1.61    1.61    1.61
Sodium Thiosulfate    Na2S2O3    2.67    2.23    1.60    1.00
For example, to dechlorinate water with a pH of 6.5 containing 50mg/L chlorine, 111.5mg/L of sodium thiosulfate anhydrous would be needed.
File CIQA-0107_H20 Dechlor With SO2.R1.pdf
Keyword 6840, 8100, 7763, 3534, 3557, 3556, 3552, 3550, 355, 3946, 3945, 3954, 5654, 5637, 4693, 4695, 7763, 8100, 6840, 5531, 4682, H371, H362, 7432, 7444, 7448, 5531,4682, h371, h362, 1321, Dechlorination of Treated Water using SO2 Containing Compounds, Sulfur
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