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GB/T 7363-2021: Test method for polynuclear aromatics in petroleum wax
Status: Valid GB/T 7363: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 7363-2021 | English | 309 |
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Test method for polynuclear aromatics in petroleum wax
| Valid |
GB/T 7363-2021
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| GB/T 7363-1987 | English | 399 |
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Paraffin wax. Determination of polynuclear aromatics
| Obsolete |
GB/T 7363-1987
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PDF similar to GB/T 7363-2021
Basic data | Standard ID | GB/T 7363-2021 (GB/T7363-2021) | | Description (Translated English) | Test method for polynuclear aromatics in petroleum wax | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E42 | | Word Count Estimation | 15,153 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 7363-2021: Test method for polynuclear aromatics in petroleum wax---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 polynuclear aromatics in petroleum wax
ICS 75:140
CCSE42
National Standards of People's Republic of China
Replacing GB/T 7363-1987
Test method for polycyclic aromatic hydrocarbons in petroleum wax
Published on 2021-12-31
2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
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 of Standardization Documents"
drafted:
This document replaces GB/T 7363-1987 "Test Method for Condensed Aromatic Hydrocarbons in Paraffin": Compared with GB/T 7363-1987, except for structural adjustment
In addition to editorial changes, the main technical changes are as follows:
--- Added "scope", and the scope of application has added microcrystalline wax, fully refined paraffin wax and special packaging wax for food (see Chapter 1);
--- Added "normative references" (see Chapter 2);
--- Added "Terms and Definitions" (see Chapter 3);
--- Change the reagent purity to analytical grade (see Chapter 5, 3:2, 3:3, 3:8~3:13 of the 1987 edition);
--- Added reagent safety warning instructions (see Chapter 5);
--- Changed the control pressure of nitrogen (see 5:4, 2:12 of the 1987 edition);
--- Increased the initial amount of purified dimethyl sulfoxide (see 5:6);
--- Added chromatography silica gel reagents (see 5:16);
--- Quartz absorption cell optical path changed from 4cm to 5cm (see 6:2, 2:10 of the 1987 edition);
--- Increase the 24/40 interface of the glass container, adsorption column and condenser (see 6:4, 6:5 and 6:9);
--- Added provisions for the use of tetrafluoroethylene polymer sleeves and grease for vacuum distillation units (see 6:11);
--- Added pipettes, acid-resistant funnels, constant temperature ovens, standard sieves and water bath equipment (see 6:13~6:17);
--- Added the note for the analysis of the unqualified absorbance of dimethyl sulfoxide and the treatment method (see 7:3:3);
--- Changed the particle size of magnesium oxide (see 7:4:4, 4:4:4 of the 1987 edition);
--- Added "Sampling" (see Chapter 8);
--- Delete the description of the dripping of the displacement agent in the adsorption separation stage of the test procedure (see 9:2:3, 5:2:3 of the 1987 edition):
Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed and managed by the National Standardization Technical Committee of Petroleum Products and Lubricants (SAC/TC280):
This document is drafted by: Fushun Petrochemical Research Institute, China Petroleum & Chemical Corporation:
The main drafters of this document: Zhao Bin, Geng Chenchen, Ling Fengxiang, Gui Xinghua:
The previous versions of this document and its superseded documents are as follows:
---First published GB/T 7363-1987 in 1987;
---This is the first revision:
Test method for polycyclic aromatic hydrocarbons in petroleum wax
Warning: Persons using this document should have practical experience in formal laboratory work: The use of this document may involve certain dangerous
materials, equipment and operations, but not all safety issues related to this are recommended: It is the user's responsibility to formulate before using this document
Appropriate safety and protection measures, and determine the applicability of relevant regulatory restrictions:
1 Scope
This document specifies the equipment, reagent materials, test preparation, sampling, test procedures and result report for the determination of fused-ring aromatic hydrocarbons in petroleum wax
and so on:
This document applies to products such as food paraffin wax, food microcrystalline wax, fully refined paraffin wax and special packaging wax:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 4756 Petroleum liquid manual sampling method
SH/T 0229 Sampling method for solid and semi-solid petroleum products
3 Terms and Definitions
The following terms and definitions apply to this document:
3:1
Polynucleararomatics
The molecule contains two or more benzene rings, and the benzene rings share two adjacent carbon atoms fused to form hydrocarbons:
4 Method overview
Use dimethyl sulfoxide as solvent to extract aromatic hydrocarbons in petroleum wax, and then use isooctane to reverse extract aromatic hydrocarbons dissolved in dimethyl sulfoxide: concentrate
To the concentration equivalent to 1g of sample per milliliter of isooctane, measure its UV absorbance: If the absorbance value exceeds the specified limit value, then use
Treated with sodium borohydride, adsorbed by magnesia-diatomaceous earth to separate the fused ring aromatic hydrocarbons, and then measure the UV absorbance: If the absorbance value is still greater than the specified
the limit value, the report fails: The first or second absorbance measurement value is not greater than the specified limit value, and the report is passed:
5 Reagents and materials
Warning: Phosphoric acid is corrosive, isooctane, n-hexadecane, acetone, benzene and methanol are flammable, acetone and benzene are toxic, benzene is a carcinogen, boron hydrogen
Sodium chloride is a strong irritant, and the above reagents are harmful to health; be careful with nitrogen compressed gas under high pressure:
5:1 Distilled water: should meet the inspection index of 7:3:4: If necessary, it needs to be purified by ion exchange resin or by other suitable methods:
A:1:2 Purification of Record A:
5:2 Phosphoric acid: analytically pure:
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