Method for determining iodate in salt
A technology of iodate and iodic acid, which is applied in the direction of color/spectral characteristic measurement, can solve the problems of time-consuming, cumbersome operation, and high cost, and achieve the effect of low measurement cost, simple and fast operation
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Embodiment 1
[0039] Example 1 : Determination of iodate content in a certain brand of edible iodized salt
[0040]Standard curve of iodate in sodium chloride: prepare iodate standard solution containing 5.0g / L sodium chloride, the concentration of the standard solution is 0-0.60mmol / L, and select the measurement wavelength 215.0nm in the wavelength range of 255.0nm-215.0nm , adopt quartz cuvette on ultraviolet spectrophotometer, measure the absorbance value of solution at wavelength 215.0nm place, obtain the standard curve A (215.0nm) that contains iodate in 5.0g / L sodium chloride solution at wavelength 215.0nm place =2.1712C+0.0124 (R 2 = 0.9996).
[0041] Pretreatment of the sample to be tested: Weigh 0.5g of the salt sample, dissolve it in water and constant volume in a 100mL volumetric flask, prepare a salt solution with a concentration of 5.0g / L, and filter it with a filter membrane with a pore size of 0.45 microns;
[0042] Detect the sample: use a quartz cuvette to measure the a...
Embodiment 2
[0046] Example 2 : Determination of iodate content in a certain brand of edible iodized salt
[0047] Standard curve of iodate in sodium chloride: prepare iodate standard solution containing 150.0g / L sodium chloride, the concentration of the standard solution is 0-1.00mmol / L, and select the measurement wavelength 255.0nm in the wavelength range of 255.0nm-215.0nm , adopt quartz cuvette on ultraviolet spectrophotometer, measure the absorbance value of solution at wavelength 255.0nm place, obtain the standard curve A (255.0nm) that contains iodate in 150.0g / L sodium chloride solution at wavelength 255.0nm place =0.1422C+0.0050 (R 2 = 0.9987);
[0048] Pretreatment of the sample to be tested: Weigh 15.0g of the salt sample, dissolve it in water and dilute it in a 100mL volumetric flask, and prepare a salt solution with a concentration of 150.0g / L, and filter it with a filter membrane with a pore size of 0.45 microns;
[0049] Detect the sample: use a quartz cuvette to measure...
Embodiment 3
[0053] Example 3 : Determination of iodate content in a certain brand of edible iodized salt
[0054] Standard curve of iodate in sodium chloride: prepare iodate standard solution containing 300.0g / L sodium chloride, the concentration of the standard solution is 0-1.00mmol / L, and select the measurement wavelength 235.0nm in the wavelength range of 255.0nm-215.0nm , adopt quartz cuvette on ultraviolet spectrophotometer, measure the absorbance value of solution at wavelength 235.0nm place, obtain the standard curve A (235.0nm) that contains iodate in 300.0g / L sodium chloride solution at wavelength 235.0nm place =0.8642C+0.0074 (R 2 = 0.9999).
[0055] Pretreatment of the sample to be tested: Weigh 30.0g of the salt sample, dissolve it in water and constant volume in a 100mL volumetric flask, prepare a salt solution with a concentration of 300.0g / L, and filter it with a filter membrane with a pore size of 0.45 microns;
[0056] Detect the sample: use a quartz cuvette to measu...
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