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GB/T 19941.1-2019 PDF English

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GB/T 19941.1-2019: Leather and fur -- Determination of formaldehyde content -- Part 1: High performance liquid chromatography method
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GB/T 19941.1: Evolution and historical versions

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GB/T 19941.1-2019English175 Add to Cart 0-9 seconds. Auto-delivery Leather and fur -- Determination of formaldehyde content -- Part 1: High performance liquid chromatography method Valid
GB/T 19941-2005English125 Add to Cart 0-9 seconds. Auto-delivery Leather and fur -- Chemical tests -- Determination of formaldehyde content Obsolete

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GB/T 19941.1-2019: Leather and fur -- Determination of formaldehyde content -- Part 1: High performance liquid chromatography method


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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.140.30 Y 46 Partially replacing GB/T 19941-2005 Leather and fur - Determination of formaldehyde content - Part 1.High performance liquid chromatography method (ISO 17226-1.2018, Leather - Chemical determination of formaldehyde content - Part 1.Method using high performance liquid chromatography, MOD) Issued on. DECEMBER 31, 2019 Implemented on. JULY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword... 3 1 Scope... 6 2 Normative references... 6 3 Principle... 7 4 Reagents and materials... 7 5 Instruments and equipment... 7 6 Test steps... 8 7 Result representation... 11 8 Test report... 11 Annex A (informative) Structural changes in this Part compared with ISO 17226- 1.2018... 12 Annex B (informative) Technical differences between this Part and ISO 17226- 1.2018 and the reasons... 13 Annex C (normative) Determination of formaldehyde content in standard stock solution... 15

Foreword

GB/T 19941 “Leather and fur - Determination of formaldehyde content” consists of the following 3 parts. - Part 1.High performance liquid chromatography method; - Part 2.Colorimetric method; - Part 3.Formaldehyde emissions. This Part is Part 1 of GB/T 19941. This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces high performance liquid chromatography in GB/T 19941- 2005 “Leather and fur-Chemical tests - Determination of formaldehyde content”. Compared with GB/T 19941-2005, the main technical changes in this Part are as follows. - added the reference to QB/T 1273, QB/T 2717 and GB/T 19941.2; deleted the references to QB/T 1266 and QB/T 2707 (see Clause 2 of this Edition, Clause 2 of Edition 2005); - modified the “Principle” (see Clause 3 of this Edition, 4.1 of Edition 2005); - added "sodium lauryl sulfate" as the extraction solution (see 4.2 of this Edition); - deleted the requirements for recrystallization of 2,4-dinitrophenylhydrazine (see 4.2.2 of Edition 2005); - added the requirements for acetonitrile purity (see 4.4 of this Edition); - added volumetric flasks and Erlenmeyer flask (see 5.1, 5.2 of this Edition); - changed water bath to constant-temperature water bath oscillator; deleted the requirements for temperature; added the requirements for frequency (see 5.4 of this Edition, 4.3.2 of Edition 2005); - changed the range of thermometer (see 5.5 of this Edition, 4.3.3 of Edition 2005); - modified the wavelength of UV detector (see 5.6 of this Edition, 4.1 of Edition 2005); - deleted the requirements for air conditioning before weighing during sample preparation (see 4.4.2.3 of Edition 2005); - modified the accuracy of the weighing amount and the deviation of the water bath temperature during extraction (see 6.2 of this Edition, 4.4.3 of Edition 2005); - modified the drawing of standard curve; added regulations for the direct preparation of formaldehyde standard solutions from commercially available reference materials (see 6.5.1 of this Edition, 4.4.6 of Edition 2005); - added the content of drawing standard working curve with 2,4- dinitrophenylhydrazine-formaldehyde derivative (see 6.5.2 of this Edition); - modified the calculation formula of the formaldehyde content in the sample (see 6.6 of this Edition, 4.4.7 of Edition 2005); - added relevant regulations for calculating test results in a dry state, method detection limits, and dispute resolution methods (see Clause 7 of this Edition); - deleted the requirements of "Explanation of test sample and packaging method", "Applied analysis method", "Test personnel, date" in "8 Test report" (see Clause 7 of Edition 2005); - adjusted the preparation of formaldehyde stock solution, determination of formaldehyde mass concentration and related reagents and instruments to Annex C; added the number of titrations of blank solution in formaldehyde stock solution; modified the molar mass of formaldehyde to 30.02g/mol (see Annex C of this Edition, Clause 3 of Edition 2005). This Part uses redrafting method by adopting ISO 17226-1.2018 “Leather - Chemical determination of formaldehyde content - Part 1.Method using high performance liquid chromatography”. Compared with ISO 17226-1.2018, there are many structural adjustments in this Part. Annex A gives a list of the article number comparison between this Part and ISO 17226-1.2018. Compared with ISO 17226-1.2018, there are technical differences in this Part. Annex B gives a list of corresponding technical differences and their reasons. This Part also made the following editorial modifications. - changed the standard name to “Leather and fur - Determination of formaldehyde content - Part 1.High performance liquid chromatography method”; - added the note for the measured formaldehyde in “3 Principle”; - deleted the example of diluting filtrate in "8.2.3 Reaction with 2,4- Dinitrophenylhydrazine" in ISO 17226-1.2018; - deleted the informative Annex A of ISO 17226-1.2018. This Part was proposed by China Light Industry Federation. This Part shall be under the jurisdiction of National Technical Committee on Leather Industry of Standardization Administration of China (SAC/TC 252). The drafting organizations of this Part. Sichuan University, China National Textile and Apparel Council Testing Center, Guangzhou Institute of Quality Supervision and Inspection, Zhejiang Tongtianxing Group Co., Ltd., China Leather and Footwear Research Institute Co., Ltd., Shengguo (Dongguan) New Material Technology Co., Ltd., Saturday Co., Ltd. Main drafters of this Part. Zhou Jianfei, Ren Zhibo, Zhong Xihao, Zeng Yunhang, Hong Wenqing, Sang Jun, Zhang Huan, Zeng Hao, Li Li. Version of standard substituted by this Part is. - GB/T 19941-2005. Leather and fur - Determination of formaldehyde content - Part 1.High performance liquid chromatography method

1 Scope

This Part of GB/T 19941 specifies high performance liquid chromatography method (HPLC) to determine free and hydrolyzed formaldehyde content in leather and fur.

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 (GB/T6682-2008, ISO3696.1987, MOD)

3 Principle

Under the specified conditions, use the extraction solution to extract the sample. The extract is mixed with 2,4-dinitrophenylhydrazine.

4 Reagents and materials

Unless otherwise specified, all reagents used are analytical reagents, and all solutions are aqueous solutions.

5 Instruments and equipment

Constant temperature water bath oscillator. oscillation frequency is (50±10) times/min.

6 Test steps

The preparation of leather sample is carried out in accordance with QB/T 2716. The preparation of fur sample is carried out in accordance with QB/T 1272. Prepare formaldehyde standard stock solution according to Annex C.

7 Result representation

The free formaldehyde content in the sample is expressed in mg/kg, to the nearest of 0.1mg/kg.

8 Test report

The test report shall contain the following.

Annex A

(informative) Structural changes in this Part compared with ISO 17226-1.2018 Compared with ISO 17226-1.2018, this Part has more structural adjustments. See Table A.1 for the comparison of specific clause numbers.

Annex B

(informative) Technical differences between this Part and ISO 17226-1.2018 and the reasons

Annex C

(normative) Determination of formaldehyde content in standard stock solution ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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