How do I calculate the amount of sodium thiosulfate needed to remove the chlorine in the sample?

Document ID

Document ID TE213

Version

Version 4.0

Status

Status Published

Published Date

Published Date 10/09/2018
Question
How do I calculate the amount of sodium thiosulfate needed to remove the chlorine in the sample?
Summary
Dechlorinating samples using sodium thiosulfate
Answer
Using solid thiosulfate: Add 7.0 mg of Product # 46001 (sodium thiosulfate, pentahydrate, ACS grade) for every milligram of chlorine. 

Using the Hach thiosulfate standard solution Product # 2409353: Use 1.13 mL of 0.0250 N thiosulfate standard solution for every milligram of chlorine

The amount in milligrams of Cl2 in a sample = (concentration result from a chlorine test) x (the number of liters of sample that is being treated).

Example: 500 mL sample of 2.0 mg/L = 1 mg Cl2. 
 

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