Lachat Method: Chloride 12-117-07-1-B

Document ID

Document ID ME185

Published Date

Published Date 05/11/2020
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Method Number
Lachat Method: Chloride 12-117-07-1-B
Summary
Method # Range MDL Units Matrix Rev. Date
12-117-07-1-B 0.25-30.0 0.05 mg/L Cl- Soil Extracts 26-Aug-11
Principle
Soil samples are extracted using a solution of calcium nitrate. Calcium nitrate is used to flocculate clay and speed the extraction process. Activated carbon is used to decolorize samples prior to analysis.

In the extracts, thiocyanate ion is liberated from mercuric thiocyanate by the formation of soluble mercuric chloride. In the presence of ferric ion, free thiocyanate ions form the highly colored ferric thiocyanate, of which the absorbance is proportional to the chloride concentration. Ferric thiocyanate absorbs strongly at 480 nm. The calibration curve is non linear.

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