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STB RB
STB 17.13.05-08-2009/ISO 5664:1984
Protection of the environment and nature. Analytical control and monitoring. Water quality. Determination of ammonia nitrogen. Distillation and titration method
STB 17.13.05-09-2009/ISO 7150-1:1984
Protection of the environment and nature. Analytical control and monitoring. Water quality. Determination of ammonia nitrogen. Part 1. Manual spectrometric method
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