Nitrite (calculated as sodium nitrite) detection

5. Turbidity 5.1 principle: Under the same conditions, compare the intensity of scattered light from the standard suspension of formalin with the intensity of scattered light from the water sample. The higher the intensity of scattered light in GB 8538-2016, the higher the turbidity. 5.2 Reagents and Materials Unless otherwise specified, all reagents used in this method are analytical pure, and the water is Grade III water as specified in GB/T 6682. 5.2.1: Sodium Sulfate Solution (10 g/L): Weigh 1.000 g of sodium sulfate [(NH,). · H, SO.] and dissolve in water, and bring to volume in a 100 ml volumetric flask. Warning - The solution has carcinogenic toxicity, avoid inhalation, ingestion, and skin contact! 5.2.2 Hexamethylenetetramine solution (100 g/L): Weigh 10.00 g of hexamethylenetetramine [(CH); N.] and dissolve in water, and bring to volume in a 100 mL volumetric flask. 5.2.3. Formamide standard suspension; Take 5. and 500 mL of peroneal sulfate solution and 5. 00 mL of hexamethylene tetramine solution into a 100 mL volumetric flask, mix well, and place at 25 ℃± 3 ℃ for 24 hours. Add water to the mark and mix well. The turbidity of this standard suspension is 400 NTU. This standard solution can be used for one month. 5.2.4. Formaldehyde standard working solution: Dilute the Formaldehyde standard suspension 10 times with water. The turbidity after dilution is 40 NTU, and it should be diluted appropriately when needed. 5.3 Instruments and Equipment Scattering Turbidity Meter. 5.4 The analysis steps should be carried out according to the instrument user manual. When the turbidity exceeds 40 NTU, it can be diluted with water and measured. The expression of analysis results is calculated by multiplying the turbidity reading displayed during instrument measurement by the dilution factor

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