Merck, 1.11132, Chloride Test

General description
Chloride is found in the earth´s crust and can therefore also be found in all natural waters at some concentration. This MQuant® Chloride test (formally MColortest®) is suitable for the titrimetric determination using a convenient dropping bottle.

Method
In nitric solution chloride ions are titrated with mercury(II) nitrate solution against 1,5-diphenylcarbazone as the indicator, forming slightly dissociated mercury(II) chloride in the process. At the titration end-point, excess mercury(II) ions react with the indicator to form a blue-violet complex. The chloride concentration is determined from the consumption of titration solution (mercurimetric determination).

The test can be used in
Groundwater, surface water, and seawater (after dilution)
Waters from aquaculture
Drinking water and mineral water
Water for concrete in the construction industry
Industrial water and wastewater
Boiler and boiler feed water, cooling water
Swimming-pool water
Food after appropriate sample pretreatment
Soils and fertilizers after appropriate sample pretreatment

This test is suitable to detect chloride interferences which are a mayjor reason for wron COD readings. Therefore it can serve as pretest for COD measurements with e.g. our Spectroquant® COD cell tests for seawater/samples with high chloride content 1.17058 and 1.17059.
Method: titrimetric with dropping bottle MQuant®
Legal Information
MCOLORTEST is a registered trademark of Merck KGaA, Darmstadt, Germany
MQUANT is a registered trademark of Merck KGaA, Darmstadt, Germany
SPECTROQUANT is a registered trademark of Merck KGaA, Darmstadt, Germany
Disclaimer
For U.S. Customers: Contains mercury; Do not place in trash - dispose according to local, state, or federal laws.