LY/T 1642-2005 English PDF

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LY/T 1642-2005: Test method for analysis of tannic acid

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Basic data

Standard ID: LY/T 1642-2005 (LY/T1642-2005)
Description (Translated English): Test method for analysis of tannic acid
Sector / Industry: Forestry Industry Standard (Recommended)
Classification of Chinese Standard: B72
Classification of International Standard: 65.020
Word Count Estimation: 10,176
Date of Issue: 2005-08-16
Date of Implementation: 2005-12-01
Regulation (derived from): State Forestry Administration Notice No. 1, 2010
Summary: This standard specifies the tannic acid analysis of test methods. This standard applies to gall as raw material for different purposes tannins product quality analysis.

LY/T 1642-2005: Test method for analysis of tannic acid

---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.
Test method for analysis of tannic acid ICS 65.020 B72 People's Republic of China Forestry Industry Standard Tannic acid analysis test method Released on.2005-08-16 Implementation of.2005-12-01 State Forestry Administration released

Content

Foreword I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Test method 1 4.1 Determination of loss on drying 1 4.2 Determination of tannic acid content 1 4.3 Determination of water insoluble matter 3 4.4 Determination of color 3 4.5 Determination of ignition residue 4 4.6 Determination of arsenic 4 4.7 Determination of lead 5 4.8 Determination of heavy metals 5 4.9 Gum, dextrin test 5 4.10 Resin Test 5 4.11 Water Dissolution Test 5 4.12 Determination of gallic acid 5

Foreword

This standard was proposed by the Institute of Chemical Industry of Forest Products of the Chinese Academy of Forestry. This standard is under the jurisdiction of the Institute of Chemical Industry of Forest Products of the Chinese Academy of Forestry. This standard was drafted by the Institute of Chemical Industry of Forest Products of the Chinese Academy of Forestry. Zhangjiajie Trade Source Chemical Co., Ltd., Hunan Province Xiwuming Gelatin Factory, Yunnan Yanjin Linhua Chemical Plant, Chongqing Changjiang Yangfan Chemical Co., Ltd., etc. participated in the drafting. The main drafters of this standard. Chen Yuhong, Wang Yumei, Wu Dongmei, Wu Zaiyu. Tannic acid analysis test method Warning - Personnel using this standard should have practical experience in formal laboratory work. This standard does not indicate all possible security questions. question. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the relevant national regulations.

1 Scope

This standard specifies the test method for tannic acid analysis. This standard applies to the analysis of the quality of tannic acid products for different uses made from gallnut.

2 Normative references

The terms in the following documents become the terms of this standard by reference to this standard. All dated references, followed by all Modifications (not including errata content) or revisions do not apply to this standard, however, parties to agreements based on this standard are encouraged to study Is it possible to use the latest version of these files? For undated references, the latest edition applies to this standard. Preparation of standard solution for GB/T 602 chemical reagent impurity determination Preparation of preparations and products used in GB/T 603 chemical reagent test method GB/T 6284 General method for determination of moisture content in chemical products - Gravimetric method GB/T 6682 Analytical laboratory water specifications and test methods GB/T 8449 Method for determination of lead in food additives GB/T 8450 Method for determination of arsenic in food additives GB/T 8451 Heavy metal limit test method for food additives

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 An extract of Galla Chinensis, whose main component is a mixture of compounds consisting of five to twelve-O-galloyl-β-D glucose.

4 Test methods

Unless otherwise specified, the reagents used in this standard are of analytical grade, and the water used shall comply with the third grade water specified in GB/T 6682. The standard solutions, preparations and products of impurities used in this standard are prepared according to the methods specified in GB/T 602 and GB/T 603. 4.1 Determination of loss on drying In accordance with the provisions of GB/T 6284. About 1 g of the sample was weighed to the nearest 0.0001 g, and the drying temperature was 105 ° C ± 2 ° C. The loss on drying is expressed in mass percent X1 and the values are expressed in %. The absolute difference between the two independent test results obtained under repetitive conditions is no more than 0.2%. Taking the arithmetic mean as the determination result. 4.2 Determination of tannic acid content 4.2.1 Principle Using a UV spectrophotometer to measure the sample solution and the non-tannin solution after removing tannic acid with chrome powder at a wavelength of 276 nm The absorbance. The difference is compared to the absorbance of the tannic acid standard sample solution. 4.2.2 Reagents and materials 4.2.2.1 Standard sample of tannic acid. the content should not be lower than 99.0%. ......

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