GB 1903.78-2025 English PDF

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GB 1903.78-2025: National food safety standard - Nutrition fortifier - Cupric citrate
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 1903.78-2025	179	Add to Cart	3 days	National food safety standard - Nutrition fortifier - Cupric citrate	Valid

Basic data

Standard ID: GB 1903.78-2025 (GB1903.78-2025)
Description (Translated English): National food safety standard - Nutrition fortifier - Cupric citrate
Sector / Industry: National Standard
Classification of Chinese Standard: X40
Word Count Estimation: 9,938
Date of Issue: 2025-09-02
Issuing agency(ies): National Health Commission; State Administration for Market Regulation

GB 1903.78-2025: National food safety standard - Nutrition fortifier - Cupric citrate

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB1903.78-2025
National Standards of the People's Republic of China National Food Safety Standards Copper citrate, a food fortifier Published on 2025-09-02 Implemented on 2026-03-02 National Health Commission of the People's Republic of China State Administration for Market Regulation issued National Food Safety Standards Copper citrate, a food fortifier 1.Scope This standard applies to processes using copper carbonate, copper oxide, and citric acid as raw materials, or copper sulfate and sodium citrate as raw materials, reacted in a certain proportion and... Copper citrate is a food fortifier produced through processing. 2.Chemical name, molecular formula, structural formula, and relative molecular mass 2.1 Chemical Name 2-Hydroxypropane-1,2,3-tricarboxylic acid copper salt 2.2 Molecular Formula C6H4Cu2O7·2.5H2O 2.3 Structural Formula 2.4 Relative Molecular Mass 360.22 (based on 2022 international relative atomic mass)

3 Technical Requirements

3.1 Sensory Requirements Sensory requirements shall comply with the provisions of Table 1. Table 1 Sensory Requirements Project Requirements Inspection Methods Colors. blue, blue-gray, or blue-green Crystalline powder, free of visible foreign impurities. Odorless Place an appropriate amount of sample in a clean, dry white porcelain dish and expose it to natural light. Observe its color and condition, and smell its odor. 3.2 Physicochemical Indicators The physicochemical properties should meet the requirements of Table 2. Table 2 Physicochemical Indicators Project indicator testing methods Copper citrate content (as Cu), w/% 34.6~36.7 (See Appendix A, A.4) pH (concentration of 30 g/L) 5~8 GB/T 9724 Loss on drying, w/% ≤ 2 (See Appendix A, A.5) Hydrochloric acid insoluble matter, w/% ≤ 0.2 (Appendix A, A.6) Sulfate (as SO4), w/% ≤ 0.05 (See Appendix A, A.7) Lead (Pb)/(mg/kg) ≤ 2.0 GB 5009.75 or GB 5009.12 Total arsenic (as As)/(mg/kg) ≤ 2.0 GB 5009.76 or GB 5009.11

Appendix A

Test methods A.1 Safety Tips Some of the reagents used in the test methods of this standard are corrosive. Handling with care is required; if splashed on skin, rinse immediately with water. Rinse thoroughly; for severe cases, seek immediate medical attention. The use of highly toxic substances must be strictly managed in accordance with relevant regulations; avoid inhalation or skin contact during use. It should be performed in a fume hood. People with open wounds on exposed areas should not touch it. A.2 General Provisions Unless otherwise specified, the reagents and water used in the test methods of this standard refer to analytical grade reagents and the three-component reagents specified in GB/T 6682. Grade A water. Unless otherwise specified, standard solutions, impurity standard solutions, preparations, and products used in the test shall conform to GB/T 601. Prepared according to the provisions of GB/T 602 and GB/T 603.Unless otherwise specified, the solutions used in the tests are all aqueous solutions. A.3 Identification Test A.3.1 Reagents and Materials A.3.1.1 Hydrochloric acid. A.3.1.2 Hydrochloric acid solution. 1 4 (V1 V2). Measure 10 mL of hydrochloric acid and slowly add it to 40 mL of water, then mix well. A.3.1.3 Ammonia solution (10%). The preparation method is in accordance with GB/T 603. A.3.1.4 Iron sheet. shiny and rust-free. A.3.1.5 Pyridine-acetic anhydride solution. 3 1 (V1 V2). A.3.1.6 Potassium ferrocyanide (0.10 g/mL). Weigh 1.0 g of potassium ferrocyanide and dissolve it in 10 mL of water. Prepare the solution fresh each time you use it. A.3.2 Instruments and Equipment Infrared spectrometer. A.3.3 Identification Method A.3.3.1 Identification of Copper Ions Take approximately 1g of the sample, dissolve it in 20mL of water, and add a small amount of hydrochloric acid to acidify the sample solution. Place a bright, rust-free iron sheet into the acidified solution. In the subsequent sample solution, a red copper film will form on the surface of the iron sheet. Take approximately 1g of the sample, dissolve it in 20mL of water, and add excess ammonia solution. A blue precipitate initially forms, then turns dark blue. Solution. Take about 1g of the sample, dissolve it in 20mL of water, add potassium ferrocyanide solution, and a reddish-brown precipitate is formed. The precipitate is insoluble in hydrochloric acid solution. A.3.3.2 Identification of citrate ions Weigh 5 mg of the sample into 5 mL of pyridine-acetic anhydride solution, shake, and a yellow to red or purplish-red solution will be formed. A.3.3.3 Identification by Infrared Absorption Spectroscopy The potassium bromide tableting method was used, and the test was conducted according to GB/T 6040.The infrared spectrum of the sample should be consistent with the reference spectrum (see reference spectrum). Consistent with Appendix B. Note. The CAS number for copper citrate referred to in this standard is 866-82-0. A.4 Determination of Copper Citrate Content A.4.1 Method Summary Under slightly acidic conditions, excess potassium iodide was added to the sample to react quantitatively with divalent copper, and the precipitate was titrated with a standard sodium thiosulfate solution. Iodine is used, and starch is used as an indicator to determine the endpoint by the color change. A.4.2 Reagents and Materials A.4.2.1 Glacial acetic acid. A.4.2.2 Potassium iodide. A.4.2.3 Sodium thiosulfate standard titration solution [c(Na2S2O3)=0.1mol/L, subject to actual concentration]. A.4.2.4 Ammonium thiocyanate solution (100 g/L). A.4.2.5 Starch indicator solution (10 g/L). A.4.3 Analysis Steps Weigh 0.1g~0.2g (accurate to 0.0001g) of the sample, place it in a 250mL iodine flask, dissolve it in 4mL of glacial acetic acid, and then add... Mix 50 mL of water and 3 g of potassium iodide, shake well, and place in the dark for 10 minutes. Titrate with sodium thiosulfate standard solution until the solution turns pale yellow. To determine the color, add 3 mL of starch indicator solution and 20 mL of ammonium thiocyanate solution, and shake well. Continue titrating until the blue color disappears, which is the endpoint. Simultaneously, a blank test should be performed. The blank test should follow the same procedures as the standard titration solution, except that no sample is added. (External) Same as the determination test. A.4.4 Result Calculation The mass fraction w of copper citrate (calculated as Cu) in the sample, expressed as %, is calculated according to formula (A.1). w= (V-V0)×c×M 1000×m × 100% (A.1) In the formula. V --- The volume of sodium thiosulfate standard solution consumed in titrating the sample, expressed in milliliters (mL); V0 --- The volume of sodium thiosulfate standard solution consumed in the blank titration test, in milliliters (mL); c --- The concentration of the sodium thiosulfate standard solution, expressed in moles per liter (mol/L); M --- The numerical value of the molar mass of copper, in grams per mole (g/mol) [M(Cu)=63.5]; m --- The numerical value of the sample mass, in grams (g); 1000---Conversion factor. The result is the arithmetic mean of the parallel determinations (rounded to one decimal place). The difference between two parallel determinations should not exceed the arithmetic mean. 5% of the average. A.5 Drying Loss A.5.1 Reagents and Materials Weighing bottle. A.5.2 Instruments and Equipment A.5.2.1 Analytical balance. sensitivity 0.0001g. A.5.2.2 Dryer. A.5.2.3 Oven. The temperature can be controlled at 105℃±2℃. ......

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