Can Sodium Thiosulfate be used to remove chlorine for BOD analysis?

Document ID

Document ID TE179

Version

Version 5.0

Status

Status Published

Published Date

Published Date 09/06/2018
Question
Can Sodium Thiosulfate be used to remove chlorine for BOD analysis?
Summary
Removing chlorine from samples before BOD analysis
Answer
Sodium thiosulfate can be used to remove chlorine from samples for Biochemical Oxygen Demand (BOD) measurements.

An excess of sodium thiosulfate can exert an oxygen demand and cause the BOD results to be higher than they should. For this reason, it is recommended that one calculate exactly how much sodium thiosulfate is needed for chlorine removal. A titration procedure for this determination is given in Methods 8043 and 10360 for BOD.

Dechlorinating Reagent Powder Pillows, pk/100 (Product # 1436369) should not be used, as they contain an excess amount of sodium thiosulfate.

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