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GB/T 42022-2022: Essential oils - Determination of water content - Karl Fischer method
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| GB/T 42022-2022 | English | 184 |
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Essential oils - Determination of water content - Karl Fischer method
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GB/T 42022-2022
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Basic data | Standard ID | GB/T 42022-2022 (GB/T42022-2022) | | Description (Translated English) | Essential oils - Determination of water content - Karl Fischer method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y41 | | Classification of International Standard | 71.100.60 | | Word Count Estimation | 10,136 | | Date of Issue | 2022-12-30 | | Date of Implementation | 2023-07-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42022-2022: Essential oils - Determination of water content - Karl Fischer 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 71.100.60
CCSY41
National Standards of People's Republic of China
Determination of water content in essential oils Karl Fischer method
(ISO 11021.1999, IDT)
Posted on 2022-12-30
2023-07-01 implementation
State Administration for Market Regulation
Released by the National Standardization Management Committee
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 11021.1999 "Determination of Moisture Content in Essential Oils by Karl Fischer Method".
The following editorial changes have been made to this document.
---Changed the footnote, change the footnote to note (see 6.3);
--- Increased note (see 9.3).
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 National Light Industry Council.
This document is under the jurisdiction of the National Standardization Technical Committee of Fragrance, Flavor and Cosmetics (SAC/TC257).
This document is drafted by. Shanghai Spice Research Institute Co., Ltd., Yiwu Product (Commodity) Quality Inspection Research Institute, Anke Cosmetics (Zhejiang
Jiang) Co., Ltd., Shanghai University of Applied Technology, Shanghai Institute of Quality Supervision and Inspection Technology, China Academy of Inspection and Quarantine, Shanghai
Center for Disease Control and Prevention, Yunnan China Tobacco Industry Co., Ltd.
The main drafters of this document. Zhou Jiang, Jin Qizhang, Yang Bin, Ma Qiang, Feng Jun, Niu Yunwei, Chen Jun, Chen Tian, Mao Deshou, Xiong Wen, Cai Bingbiao,
Ni Weiwei.
Determination of water content in essential oils Karl Fischer method
1 Scope
This document describes the Karl Fischer method for the determination of water content in essential oils.
This document applies to the determination of the moisture content of essential oils.
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.
Note. GB/T 6283-2008 Determination of moisture content in chemical products Karl Fischer method (general method) (ISO 760.1978, NEQ)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Moisture contentwatercontent
The amount of water contained in the essential oil.
Note. Moisture content is expressed in mass fraction (%).
4 principles
The moisture present in the sample is absorbed by the dry methanol. The water reacts with the Karl Fischer reagent (without pyridine), while the Karl Fischer test
The reagents were previously calibrated by titration using a Karl Fischer apparatus. Reaction endpoints were obtained electrometrically.
5 reactions
During the determination of moisture according to the Karl Fischer method, the moisture present in the sample, in the presence of an amine and an alcohol, reacts with iodine and dioxygen
Sulfurization reaction.
H2O I2 SO2 ROH 3RnNH3-n→2RnNH3-nHI RnNH3-nHSO4R
In the formula, R is an alkyl or alkoxy group.
The end point of the reaction is obtained by electrometry according to the remaining amount of iodine.
6 reagents
Use only approved analytical grade reagents and distilled water, or demineralized water, or water of equivalent purity.
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