This standard was last reviewed and confirmed in 2018. Therefore this version remains current.
The method is based on weighing a test portion, dissolving it in water, transfer of the solution to each of two Nessler colour-comparison cylinders, preparing a test solution by adding freshly prepared ammoniacal silver nitrate solution to one of the Nessler cylinders and mixing well, preparing a blank solution by adding ammonium hydroxide solution and water to the other Nessler cylinder and mixing well, allowing the solutions to stand for 2 min, and comparing the colour and turbidity of the two solutions.
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|std 1 40|
|std 2 40||Paper|
A standard is reviewed every 5 years
Stage: 90.20 (Under review)
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