Method for determining the ammonium citrate content

Determination of ammonium citrate: 1. Reagents: 1∶5 neutral formalin solution (formalin solution is diluted with deionized water to achieve a 1∶5 volume ratio; a few drops of phenolphthalein indicator are added, and then it is titrated with 0.1 N NaOH until a slight pink color appears)； Phenolphthalein indicator ； 0. 1N NaOH solution. 2. Analysis: Take 5 mL of the plating solution, add 50 mL of water, add a few drops of phenolphthalein indicator, and titrate with 0.1N NaOH solution until a pink color appears. Then add 50 mL of neutral formalin solution, and continue titrating with 0.1N NaOH solution until pink color is achieved. 3. The ammonium citrate content in the plating solution is calculated using the following formula: Ammonium citrate = N × V1 × 0.08108 × 1000 / V (g/L), where N is the equivalent concentration of the standard NaOH solution ； V1--Volume of NaOH solution consumed in titration (mL) ； V--the volume of the plating solution sample taken (mL).

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