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

Document ID

Document ID ME185

Published Date

Published Date 05/11/2020
Method Number
Lachat Method: Chloride 12-117-07-1-B
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
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.

Download the method

*Please note diagrams are not included.  Please contact Lachat Technical Support or reach out to your Lachat sales representative for a version containing the method diagram.