GB/T 41711-2022 English PDF (GB/T41711-2022)

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GB/T 41711-2022: Determination of acid resistance, sulfur resistance and salt resistance of inner coating or laminated-film in metal containers used for food
GB/T 41711-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.250
CCS A 82
Determination of acid resistance, sulfur resistance and salt
resistance of inner coating or laminated film in metal
containers used for food
ISSUED ON: NOVEMBER 08, 2022
IMPLEMENTED ON: JUNE 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principle ... 4
5 Reagents and materials ... 4
6 Instruments and equipment ... 6
7 Test procedure ... 6
8 Result presentation ... 8
Determination of acid resistance, sulfur resistance and salt
resistance of inner coating or laminated film in metal
containers used for food
1 Scope
This document describes the methods for the determination of acid resistance, sulfur
resistance and salt resistance of inner coating or laminated film in metal containers used
for food.
This document applies to metal containers for food (cans, beverages, etc.) based on
coated iron (or aluminum) or laminated iron (or aluminum).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
3 Terms and definitions
This document does not have terms and definitions that need to be defined.
4 Principle
By simulating the corrosion of the actual contact contents on the inner coating or
laminated film of metal containers for food, to evaluate the acid resistance, sulfur
resistance and salt resistance.
5 Reagents and materials
Unless otherwise specified, use only analytical grade reagents.
5.1 Reagents
5.1.1 Water, GB/T 6682, Class III.
5.1.2 Glacial acetic acid.
5.1.3 Citric acid monohydrate (C6H8O7 · H2O): purity > 99 %.
5.1.4 L-cysteine hydrochloride monohydrate (C3H8NO2SCl • H2O): purity > 99 %.
5.1.5 Potassium dihydrogen phosphate (KH2PO4): purity > 99 %.
5.1.6 Disodium hydrogen phosphate dodecahydrate (Na2HPO4 • 12H2O): purity > 99 %.
5.1.7 Sodium sulfide nonahydrate (Na2S • 9H2O): purity > 99 %.
5.1.8 Sodium chloride (NaCl): purity > 99 %.
5.2 Preparation of reagents
5.2.1 Acetic acid solution (3 % volume fraction)
MEASURE 30 mL of glacial acetic acid in a 1000 mL volumetric flask, DILUTE to the
mark with water.
5.2.2 Citric acid solution (20 g/L)
WEIGH 21.86 g of citric acid monohydrate (C6H8O7 • H2O), DISSOLVE it in water
and DILUTE to 1000 mL.
5.2.3 Mixed solution of L-cysteine hydrochloride (0.56 g/L), potassium dihydrogen
phosphate (3.6 g/L), disodium hydrogen phosphate (7.2 g/L)
WEIGH 0.56 g of L-cysteine hydrochloride monohydrate (C3H8NO2SCl • H2O), 3.60 g
of potassium dihydrogen phosphate (KH2PO4) and 18.2 g of disodium hydrogen
phosphate dodecahydrate (Na2HPO4 • 12H2O), DISSOLVE them in water respectively,
MIX them and DILUTE to 1000 mL with water. The mixed solution shall be used within
4 hours after preparation.
5.2.4 Sodium sulfide solution (0.5 g/L)
WEIGH 1.54 g of sodium sulfide nonahydrate (Na2S • 9H2O), DISSOLVE it in water
and DILUTE to 1000 mL, ADJUST the pH value to 5.5 ~ 6.0 with lactic acid.
5.2.5 Sodium chloride solution (30 g/L)
WEIGH 30 g of sodium chloride (NaCl), DISSOLVE it in water and DILUTE to 1000
mL.