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Total Nitrogen Standard (1000 mg/l) – for photometric applications acc to EN 25663 (ISO 5663) and ISO 7150
Total Bound Nitrogen (TNb) 1000 mg/l acc. to ISO 20236:2024 – 2 components: 500mg/l each of (NH4)2SO4 as Nitrogen ; KNO3 as Nitrogen in H2O