This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of fluoridated edible salt. This standard applies to fluoridated edible salt. Fluoridated edible salt is suitable for people in areas where the fluoride content in drinking water is less than 0.5 mg/L, but not for areas where the fluoride content in drinking water is higher than 1 mg/L and other patients with fluorosis. QB 1680-1993 Fluoridated edible salt QB1680-1993 standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Fluorinated Edible Salt
1 Subject Content and Scope of Application
QB 1680--1993
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of fluoridated edible salt. This standard applies to fluoridated edible salt. Fluoridated edible salt is suitable for people in areas where the fluoride content in drinking water is less than 0.5 mg/L, and is not suitable for areas where the fluoride content in drinking water is higher than 1 mg/L and other patients with fluorosis. 2 Reference Standards
Edible Salt
GB5461
GB/T8618 Sampling Methods for Main Products of Salt Industry GB/T13025.1~13025.10 General Test Methods for Salt Industry 3 Technical Requirements
3.1 Sensory Index
White color, no visible impurities or foreign matter, uniform particle size, strong taste, no bitterness, no foreign matter. 3.2 Physical and chemical indicators
3.2.1 Fluorine content is (100±30) mg/kg. 3.2.2 Other physical and chemical indicators shall comply with the requirements of GB5461, see Table 1. Table 1
Whiteness, degree
Sodium nitride, %
Moisture, %
Water-insoluble matter, %
Sodium (as Ba), mg/kg
Arsenic (as As), mg/kg
Lead (as Pb), mg/kg
Potassium ferrous fluoride (as CFe(CN)s]-^), mg/kg4 Test method
Sensory index
All passed through 0.85mm sieve,
The matter on 0.15mm sieve was greater than or equal to 90%
In a room with sufficient light and pure air, visually inspect the color, impurities, trademark and packaging, and taste and identify the taste and smell. 4.2 Physical and chemical indicators
4.2.1 Determination of fluoride ion content
4.2.1.1 Principle
Approved by the Ministry of Light Industry of the People’s Republic of China on March 28, 1993104
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Implementation on October 1, 1993
QB1680-1993
Insert a fluoride ion selective electrode and a saturated calomel electrode into the sample solution. The potential difference changes with the concentration of fluoride ions in the solution. The law of potential change conforms to the Nernst equation. The potential difference before and after adding a certain amount of standard solution into the sample solution is determined, and the fluoride content of the sample is calculated.
4.2.1.2 Instruments and equipment
General experimental instruments and
Universal ion meter or acidity meter (accuracy 1mV); fluoride ion selective electrode;
Saturated calomel electrode;
Micro syringe 0.2mL (or use 1.0ml pipette); electromagnetic stirrer.
4.2.1.3 Reagents and solutions
4.2.1.3.1 Sodium fluoride (GB/T1264) standard solution Weigh 1.1050g (accurate to 0.0001g) of sodium fluoride that has been dried at (110±2)℃ for 2h, dissolve it in water, transfer it into a 500mL volumetric flask, add water to dilute to the mark, shake well, and store in a polyethylene plastic bottle. This solution contains 1000μg of fluoride per mL. 4.2.1.3.2 Sodium acetate (GB/T695)-trisodium citrate (HG3) ionic strength buffer solution Weigh 62g of anhydrous sodium acetate and 0.3g of trisodium citrate and dissolve them in water, add 15mL of glacial acetic acid, and dilute to 1L with distilled water. 4.2.1.4 Determination steps
Weigh 50g of fluoride-added salt sample (accurate to 0.01g) and place it in a 250mL volumetric flask, dilute to the scale with distilled water, shake well (filter if necessary), and this sample solution contains 0.2g of table salt in 1ml. Pipette 10.0mL of sample solution into a 50mL beaker, add 10mL of sodium acetate-trisodium citrate ionic strength buffer solution, place the beaker on an electromagnetic stirrer, immerse the electrode in the solution, stir until the reading is stable (about 10min), and record the millivolt value. Then use a microsyringe to add 0.20mL of fluorine standard solution under stirring until the reading is stable (about 6min), then record the millivolt value, and record the solution temperature at the same time.
4.2.1.5 Expression and calculation of results
(log-i△E/S) 1
Wherein: X-fluoride ion content, mg/kg;
Cx—fluoride content in sample, μg;
Gfluoride content in added standard solution, ug;
AE—difference between two recorded millivolt values;
-slope [0.198 4(273+t)], mV;
t-solution temperature, C;
log-→———antilogarithm;
W refers to the mass of sample·g.
The sample with fluoride ion content of (100±30) mg/kg is qualified. 4.2.2 Determination of chloride ion content
Determine in accordance with GB/T13025.5.
4.2.3 Determination of calcium ion content
Determined in accordance with GB/T13025.6.
4.2.4 Determination of magnesium ion content
Determined in accordance with GB/T13025.6.
4.2.5 Determination of sulfate ion content
·(2)
Determined in accordance with GB/T13025.8.
4.2.6 Determination of moisture
Determined in accordance with GB/T13025.3.
4.2.7 Determination of water-insoluble matterwwW.bzxz.Net
Determined in accordance with GB/T13025.4.
4.2.8 Determination of arsenic limit
Determined in accordance with 2.17 of GB5461 edible salt.
4.2.9 Determination of lead limit
Determine in accordance with GB/T13025.9.
4.2.10 Determination of lock limit
Determine in accordance with 2.14 of GB5461 edible salt.
4.2.11 Determination of whiteness
Determine in accordance with GB/T13025.2.
4.2.12 Determination of particle size
Determine in accordance with GB/T13025.1.
4.2.13 Determination of potassium ferrocyanide
Determine in accordance with GB/T13025.10.
QB1680—1993
4.2.14 Calculation of sodium chloride and soluble impurities and inspection of test results shall be carried out in accordance with 5.15 of GB5461.
5 Inspection rules
5.1 Each batch of products must be inspected and qualified before leaving the factory. Each batch of products leaving the factory should be accompanied by a quality certificate, indicating the manufacturer name, product name, batch number, factory date, and standard number. 5.2 Sampling inspection: The sampling method shall be carried out in accordance with 4.4.1 of GB/T8618. 5.3 If the inspection results do not meet the product standards, double sampling and re-inspection can be carried out. The re-inspection results shall prevail. If it still fails, it shall not leave the factory. 5.4 When the supply and demand parties have objections to the product quality, they shall jointly submit it to the arbitration unit for inspection. 6 Marking, packaging, transportation, storage
6.1 The packaged fluoridated edible salt shall have the following obvious signs: fluoridation amount, standard number, manufacturer name, purpose, net weight, batch number and trademark, and shall not be mixed with other edible salt.
6.2 There should be a cover during transportation. The means of transportation must be clean and dry, and must not be contaminated or damp. 6.3 The products should be properly stored and stacked in a clean warehouse in an orderly manner. Additional remarks:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Sea and Lake Salt Standardization Center. This standard was drafted by the 9045th Factory of the Chinese People's Liberation Army and the Hubei Salt Administration. The main drafters of this standard are Zhou Hanting, Liu Xiying, Liu Shanli and Xiao Yidong. 106
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