GB/T 13025.10-2012: Translated English of Chinese Standard. (GBT 13025.10-2012, GB/T13025.10-2012, GBT13025.10-2012): General Test Method in Salt Industry - Determination of Ferrocyanide
https://www.chinesestandard.net, Oct 19, 2018 - Science - 10 pages
This Part of GB/T 13025 specifies the test method of determining the ferrocyanide in the edible salt. The ferrous sulfate method in this Part is applicable to the determination of samples with a ferrocyanide content of 1mg/kg above; while the pyridine-pyrazolone method is applicable to the determination of samples with a ferrocyanide content of 1mg/kg below.
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0.3mL of chloramine 0.45µm filter membrane 100mL of water 100mL volumetric flask 10mL of sodium 10mL of tartaric 1mL of solution 4.0mL of phosphate 4mL of ferrous 5.0g of specimen 50mL colorimetric tube 5g of sodium absolute ethanol acetic acid solution add 4mL add 5g add water adjust till colorless chloramine T solution containing 0µg content of 1mg/kg dissolve into 200mL distillation flaks ferrocyanide content ferrocyanide mass ferrocyanide standard stock ferrous sulfate solution filter with 0.45µm measure the absorbance Method in Salt mg/kg mix evenly phenolphthalein indicator phosphate buffer solution Pipette potassium ferrocyanide standard pyridine Pyridine-Pyrazolone Method pyridine-pyrazolone solution Salt Industry scale shake evenly sodium chloride 3.2.2 sodium hydroxide solution solution contains solution Take Spectrophotometer stand for 10min Standard curve standard stock solution standard working solution sulfate solution 3.2.4 take reagent blank tartaric acid solution Test Method transfer into 500mL water to dilute water to dissolve wavelength of 670nm