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GB/T 38411-2019 English PDF

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US$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 38411-2019: Leather chemicals - Determination of the free formaldehyde in leather process auxiliaries
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38411-2019	199	Add to Cart	3 days	Leather chemicals - Determination of the free formaldehyde in leather process auxiliaries	Valid

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Basic data

Standard ID: GB/T 38411-2019 (GB/T38411-2019)
Description (Translated English): Leather chemicals - Determination of the free formaldehyde in leather process auxiliaries
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y46
Classification of International Standard: 59.140.10
Word Count Estimation: 10,165
Date of Issue: 2019-12-31
Date of Implementation: 2020-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 38411-2019: Leather chemicals - Determination of the free formaldehyde in leather process auxiliaries

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Leather chemicals--Determination of the free formaldehyde in leather process auxiliaries ICS 59.140.10 Y46 National Standards of People's Republic of China Free in leather chemicals leather processing aids Determination of formaldehyde (ISO 27587..2009, Leather-Chemicaltests-Determinationofthefree formaldehydeinprocessauxiliaries, MOD) 2019-12-31 release 2020-07-01 implementation State Administration of Market Supervision Published by the National Standardization Administration

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the redrafting method to modify the use of ISO 27587..2009 Determination ". Compared with ISO 27587..2009, this standard has more structural adjustments.Appendix A gives the standard and ISO 27587..2009. List of chapter number comparisons. There are technical differences between this standard and ISO 27587..2009. Appendix B gives a list of corresponding technical differences and their causes. The following editorial changes have been made to this standard. --- The standard name was revised to "Determination of free formaldehyde in leather chemicals and leather processing auxiliaries", more in line with China's standardization system; --- Removed informative appendix A. This standard is proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Leather Industry Standardization Technical Committee (SAC/TC252). This standard was drafted. Sichuan University, Sichuan Tingjiang New Materials Co., Ltd., Zhejiang Shenghui Chemical Co., Ltd., China Leather Shoes Research Institute Co., Ltd., Jinjiang Anhai Yuantai Tannery Co., Ltd., Dongguan Weide Technology Development Co., Ltd. The main drafters of this standard. Wang Yanan, Zhou Jianfei, Deng Yong, Jiang Deyun, Ren Keshuai, Huang Haisheng, Zhang Wenfu. Free in leather chemicals leather processing aids Determination of formaldehyde

1 Scope

This standard specifies the determination method of free formaldehyde in leather processing aids. This standard applies to the determination of free formaldehyde in various leather processing aids.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 6682 Analytical laboratory water specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Freeformaldehyde When the sample is heated in a dry, inert environment, the formaldehyde released under dynamic conditions.

4 Principle

After the sample is heated in an inert environment for a specific time, the released formaldehyde is collected and reacted with 2,4-dinitrophenylhydrazine (DNPH) to produce Formaldehyde and gadolinium were quantitatively determined by reversed-phase high performance liquid chromatography at specified wavelengths.

5 Reagents and materials

5.1 General requirements. Unless otherwise specified, all reagents used are of analytical grade. The used solutions are all aqueous solutions. 5.2 Acetonitrile, HPLC grade. 5.3 Water, in line with GB/T 6682 level 1 water regulations, used for HPLC testing. 5.4 concentrated phosphoric acid (85%). 5.5 2,4-dinitrophenylhydrazine (DNPH) solution, 0.3g DNPH was dissolved in 100mL concentrated phosphoric acid (5.4). 5.6 Absorption liquid, prepare DNPH solution (5.5), acetonitrile (5.2) and water (5.3) according to the volume ratio of 1. 8. 11.

6 Instruments and equipment

6.1 Oil bath with stirring device, the temperature is constant at (90 ± 3) ℃, and its depth should ensure that the U-shaped tube is immersed in oil. 6.2 Silicone oil, suitable for oil bath (6.1). ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 38411-2019_English be delivered?

Answer: Upon your order, we will start to translate GB/T 38411-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 38411-2019_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 38411-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.