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GB/T 41942-2022 English PDF

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US$184.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 41942-2022: Rubber, raw natural, and rubber latex, natural - Determination of nitrogen content - Micro Dumas combustion method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 41942-2022	184	Add to Cart	3 days	Rubber, raw natural, and rubber latex, natural - Determination of nitrogen content - Micro Dumas combustion method	Valid

Similar standards

GB/T 24797.2 GB/T 37498 GB/T 18011 GB/T 17821 GB/T 41943

Basic data

Standard ID: GB/T 41942-2022 (GB/T41942-2022)
Description (Translated English): Rubber, raw natural, and rubber latex, natural - Determination of nitrogen content - Micro Dumas combustion method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B72
Classification of International Standard: 83.040.10
Word Count Estimation: 10,114
Date of Issue: 2022-12-30
Date of Implementation: 2023-04-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41942-2022: Rubber, raw natural, and rubber latex, natural - Determination of nitrogen content - Micro Dumas combustion method

---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.
ICS 83.040.10 CCSB72 National Standards of People's Republic of China Determination of nitrogen content in raw natural rubber and natural rubber latex Micro Dumas Combustion (ISO 19051.2015,Rubber,rawnatural,andrubberlatex,natural- Posted on 2022-12-30 2023-04-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

Preface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Principle 1 5 Reagent 2 6 Instruments and equipment 2 7 Calibration 3 8 Sampling and Specimen Preparation 3 9 Test Step 4 10 Test report 5 Appendix A (Normative) Calibration Procedure 6 Appendix B (Informative) Technical Rationality of Micro-Dumas Combustion Method 7

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is equivalent to ISO 19051.2015 "Determination of Nitrogen Content in Natural Raw Rubber and Natural Latex by Micro-Dumas Combustion Method". A chapter "Terms and Definitions" has been added to this document. The following minimal editorial changes have been made to this document. --- In order to coordinate with the existing standard, change the name of the standard to "Determination of Nitrogen Content in Natural Raw Rubber and Natural Rubber Latex Micro-Dumas Combustion Law". Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Petroleum and Chemical Industry Federation. This document is sponsored by the National Rubber and Rubber Products Standardization Technical Committee Natural Rubber Sub-Technical Committee (SAC/TC35/SC8) Focus on. This document was drafted by. Institute of Agricultural Products Processing, Chinese Academy of Tropical Agricultural Sciences, China Petroleum Corporation Petrochemical Research Institute, Double Coin Group Shanghai Tire Research Institute Co., Ltd., Zhongce Rubber Group Co., Ltd., Hainan Natural Rubber Quality Inspection Station, Guangzhou Customs Technical Center. The main drafters of this document. Chen Min, Li Yimin, Liu Suibo, Li Jihua, Yang Chunliang, Dong Wenwu, Li Jian, Zhou Shixiong, Liu Yunfeng, Liu Nengsheng, Lu Guang.

Introduction

Dumas (Dumas) combustion method has been widely used in countries all over the world, it can accurately and quickly determine the nitrogen content. With wet chemical Kjeldahl (Kjel- Dahl) nitrogen determination method, Dumas combustion method has the advantages of rapidity, safety and environmental friendliness. Representative analysis of common natural products Larger samples of 1 g or more are required. The nitrogen content of natural rubber is related to the protein content. The protein content of natural rubber depends on the source and the processing method used. The nitrogen content of natural raw rubber is usually 0.3%~0.6%. The nitrogen content of general latex products is lower than that of "dry" rubber, about 0.2%. However, The "glue clear" rubber with higher protein content has a significantly higher nitrogen content, ranging from 1.5% to 2.5%. This test method determines the nitrogen content in the shortest time possible, and will play a helpful role in laboratory quality control tests. Determination of nitrogen content in raw natural rubber and natural rubber latex Micro Dumas Combustion Caution 1 --- Personnel using this document should have practical experience in formal laboratory work. This document does not indicate all possible safety question. It is the user's responsibility to take appropriate safety and health measures and ensure compliance with the relevant national laws and regulations. Warning 2 --- Some steps specified in this document may involve or generate substances or wastes that may cause harm to the local environment. should refer to Appropriate safe handling and disposal documentation.

1 Scope

This document describes a test method for the determination of the nitrogen content of natural raw rubber and latex latex using the micro-Dumas combustion method. This method is applicable to the determination of the nitrogen content of natural raw rubber and natural latex.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. ISO 123 latex sampling (Rubberlatex-Sampling) Note. GB/T 8290-2021 latex sampling (ISO 123.2001, MOD) Note. GB/T 8298-2017 Determination of total solid content of latex (ISO 124.2014, MOD) Note. GB/T 15340-2008 Natural and synthetic raw rubber sampling and sample preparation method (ISO 1795.2000, IDT) Note. GB/T 25269-2010 Guidelines for Calibration of Rubber Test Equipment (ISO 18899.2004, IDT)

3 Terms and Definitions

This document does not have terms and definitions that need to be defined. ISO and IEC have established terminology databases for standardization purposes. The websites are as follows.

4 principles

Nitrogen in rubber samples is converted to nitrogen/nitrogen oxides during combustion (furnace temperature about 1000 °C). If other elements are present, this These elements are also transformed into different combustion products. These additional combustion products are removed using a range of absorbents. The combustion products are carried out of the combustion chamber by an inert carrier gas (such as helium) and passed through the heated (about 600°C) high-purity copper. high purity copper Place in the bottom of the firebox or another furnace. The role of high-purity copper is to remove unconsumed oxygen during the initial combustion stage and to transfer all nitrogen ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 41942-2022_English be delivered?

Answer: Upon your order, we will start to translate GB/T 41942-2022_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 41942-2022_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 41942-2022_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.