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Chemistry / Does anyone test water for chlorides with a titration method?
« on: 02/06/2009 17:07:32 »
Our chloridometer is on the fritz and my boss and I have been trying a few different methods for determining chlorides (mg Cl-/L) in the water we use here in the lab where I work.
The method we have been trying is an argenometric titration using silver nitrate and powder pillows or liquid potassium chromate as the indicator.
The main problem with that method is that the endpoint (color turns from yellow to pinkish-yellow) is very hard to determine. It's almost subjective, unless you did about 1000 standards and became an expert on the fine color change. Any ideas, suggestions, etc.? We're trying not to spend lots of money to get a new chloridometer or probe for other meters.
The method we have been trying is an argenometric titration using silver nitrate and powder pillows or liquid potassium chromate as the indicator.
The main problem with that method is that the endpoint (color turns from yellow to pinkish-yellow) is very hard to determine. It's almost subjective, unless you did about 1000 standards and became an expert on the fine color change. Any ideas, suggestions, etc.? We're trying not to spend lots of money to get a new chloridometer or probe for other meters.