GB 7300.808-2025 Feed additives—Part 8：Preservatives,mildew preventives and acidity regulators—Sodium diacetate English, Anglais, Englisch, Inglés, えいご
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ICS
CCS H
National Standard of the People's Republic of China
GB 7300.808-2025
Feed additives - Part 8：Preservatives, mildew preventives and acidity regulators - Sodium diacetate
饲料添加剂 第8部分：防腐剂、防霉剂和酸度调节剂 双乙酸钠
Issue date: 2025-12-31 Implementation date: 2027-01-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Preface
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Chemical Name, Molecular Formula, Relative Molecular Mass, and Structural Formula
5 Technical Requirements
6 Sampling
7 Test Methods
8 Inspection Rules
9 Labeling, Packaging, Transport, Storage, and Shelf Life
Introduction
Feed additives refer to small or trace substances added during the processing, manufacturing, or use of feed, including nutritional feed additives and general feed additives. For ease of use, GB 7300 "Feed Additives" is divided into the following 13 major categories based on product type:
— Part 1: Amino acids, amino acid salts, and their analogues;
— Part 2: Vitamins and vitamin-like substances;
— Part 3: Mineral elements and their complexes (chelates);
— Part 4: Enzyme preparations;
— Part 5: Microorganisms;
— Part 6: Non-protein nitrogen;
— Part 7: Antioxidants;
— Part 8: Preservatives, anti-mold agents, and acidity regulators;
— Part 9: Colorants;
— Part 10: Flavoring and palatability-enhancing substances;
— Part 11: Binders, anti-caking agents, stabilizers, and emulsifiers;
— Part 12: Polysaccharides and oligosaccharides;
— Part 13: Others.
The product in this document, sodium diacetate, belongs to Part 8, Preservatives, anti-mold agents, and acidity regulators. As sodium diacetate is the 8th product standard published within this major category, this document is numbered GB 7300.808, serving as Part 808 of GB 7300.
Feed Additives — Part 8: Preservatives, Anti-mold Agents, and Acidity Regulators — Sodium Diacetate
1 Scope
This document provides the chemical name, molecular formula, relative molecular mass, and structural formula of sodium diacetate. It specifies the technical requirements, inspection rules, and requirements for labeling, packaging, transport, storage, and shelf life for the feed additive sodium diacetate. It also describes sampling and test methods.
This document is applicable to the feed additive sodium diacetate product produced by reacting acetic acid and sodium hydroxide or sodium carbonate.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 601 Chemical Reagents — Preparation of Standard Volumetric Solutions
GB/T 603 Chemical Reagents — Preparations of Reagents and Solutions for Use in Test Methods
GB/T 6283 Determination of Water Content in Chemical Products — Karl Fischer Method (General Method)
GB/T 6682 Water for Analytical Laboratory Use — Specification and Test Methods
GB/T 8170 Rules for Rounding off of Numerical Values & Expression and Judgement of Limiting Values
GB/T 9725 Chemical Reagents — General Rules for Potentiometric Titration
GB 10648 Feed Labeling
GB/T 13079 Determination of Total Arsenic in Feeds
GB/T 14699 Feeding Stuffs — Sampling
NY/T 4689 Test for Limits of Heavy Metals in Feed Additives — Turbidimetric Method
3 Terms and Definitions
No terms and definitions need to be defined for this document.
4 Chemical Name, Molecular Formula, Relative Molecular Mass, and Structural Formula
4.1 Chemical Name: Sodium diacetate
4.2 Molecular Formula: C₄H₇NaO₄
4.3 Relative Molecular Mass: 142.09 (based on 2022 International Relative Atomic Masses)
4.4 Structural Formula:
5 Technical Requirements
5.1 Appearance and Characteristics
Shall be a white crystalline powder, readily soluble in water, with an acetic acid odor.
5.2 Identification
5.2.1 Sodium Ion
When the sample is burned in a colorless flame, the flame should show a bright yellow color.
5.2.2 Acetate Ion
When reacted with ferric chloride, it should produce a deep red color, which fades upon dropwise addition of hydrochloric acid; when reacted with sulfuric acid, it should generate acetic acid, and heating should produce an acetic acid odor.
5.3 Physicochemical Indicators
Shall comply with the requirements in Table 1.
5.4 Sanitary Indicators
Shall comply with the requirements in Table 2.
6 Sampling
Carry out according to GB/T 14699.
7 Test Methods
Warning: Some reagents used in the test methods are corrosive. Operate with caution and take appropriate safety and protective measures.
7.1 General Provisions
Unless otherwise specified, all reagents used shall be of analytical grade; all reagents and solutions shall be prepared in accordance with GB/T 601 and GB/T 603; the water used for testing shall be Grade 3 water as specified in GB/T 6682.
7.2 Appearance and Characteristics
Place an appropriate amount of sample on a clean, dry white porcelain plate. Observe its color and form, and smell its odor under natural light. Take about 1 g of sample and place it in 5 ml of water; it should dissolve completely.
7.3 Identification
7.3.1 Reagents or Materials
7.3.1.1 Hydrochloric acid.
7.3.1.2 Ferric chloride solution: Weigh 9 g of ferric chloride, add 100 ml of water to dissolve.
7.3.1.3 Hydrochloric acid solution: Hydrochloric acid + water = 1 + 9.
7.3.1.4 Sulfuric acid solution: Sulfuric acid + water = 1 + 2.
7.3.2 Apparatus and Equipment
7.3.2.1 Electronic balance: Precision 0.01 g.
7.3.2.2 Platinum wire.
7.3.2.3 Electric hot plate or burner.
7.3.3 Test Procedure
7.3.3.1 Sodium Ion
Take about 0.2 g of sample, add 10 ml of water to dissolve. Dip the platinum wire into hydrochloric acid (7.3.1.1), burn in a colorless flame until the flame is colorless. Then dip the wire into the sample solution and burn in a colorless flame. The flame should show a bright yellow color.
7.3.3.2 Acetate Ion
Take about 1 g of sample, add 10 ml of water to dissolve to obtain the test solution. Identify the acetate ion by the following methods:
— Place 2 ml of the test solution into a test tube, add 1 drop of ferric chloride solution (7.3.1.2). A deep red color should appear. Then add hydrochloric acid solution (7.3.1.3) dropwise; the red color should fade.
— Place 2 ml of the test solution into a test tube, add 1 ml of sulfuric acid solution (7.3.1.4), and heat. An acetic acid odor should be produced.
7.4 Sodium Acetate (CH₃COONa) Content
7.4.1 Principle
In an acetic acid medium, perchloric acid reacts with sodium acetate in sodium diacetate to form sodium perchlorate and acetic acid. The sodium acetate in the sample is titrated with a perchloric acid standard volumetric solution. The sodium acetate content is calculated based on the volume of perchloric acid standard volumetric solution consumed.
7.4.2 Reagents or Materials
7.4.2.1 Glacial acetic acid.
7.4.2.2 Perchloric acid standard volumetric solution: c(HClO₄) = 0.1 mol/L. Prepare and standardize according to GB/T 601.
7.4.3 Apparatus and Equipment
7.4.3.1 Analytical balance: Precision 0.0001 g.
7.4.3.2 Potentiometric titrator: With a glass electrode as the indicating electrode and a saturated calomel electrode (with saturated potassium chloride solution in anhydrous methanol in the glass sleeve) or a silver-silver chloride electrode as the reference electrode, or a combination electrode.
7.4.3.3 pH meter: Precision ±2 mV.
7.4.4 Test Procedure
Carry out the test in duplicate. Weigh approximately 0.5 g (accurate to 0.0001 g) of sample into a 100 ml beaker or conical flask. Add 50 ml of glacial acetic acid (7.4.2.1) to dissolve, and mix well. Adjust the parameters according to the potentiometric titrator instructions. Titrate the sample with the perchloric acid standard volumetric solution (7.4.2.2), and determine the titration endpoint using the potentiometric titrator (7.4.3.2).
Alternatively, insert the electrodes into the solution, adjust the stirring speed so that the solution is adequately vortexed. Use the pH meter (7.4.3.3), taking the abrupt change in potential value as the titration endpoint, and determine the endpoint according to the provisions of the second-derivative method in GB/T 9725.
Perform a blank test in the same manner.
7.4.5 Test Data Processing
The sodium acetate (CH₃COONa, on a dry basis) content w₁ in the sample, expressed as a mass fraction in %, is calculated according to formula (1):
The test result is expressed as the arithmetic mean of the results of the parallel determinations, rounded to one decimal place.
7.4.6 Precision
