GB/T 483-2007General rules for analytical and testing methods of coal (English PDF)

3.1 Terms and Definitions for Coal Sampling and Sample Preparation

3.1.1 Coal sample

A portion of representative coal taken out of coal for determining some features

of coal.

3.1.2 Seam-sample of coal

Coal sample taken from one seam in the excavating working face, exploring

tunnel or gallery as required.

3.1.10 Common sample of coal

Coal sample taken for multiple tests.

3.1.11 Moisture sample of coal

Coal sample taken specifically for the determination of total moisture.

3.1.12 Air-dried sample of coal

Coal sample reaching air drying state.

3.1.13 General-analysis test sample of coal

Coal sample, crushed to the particle size less than 0.2mm, reaching the air

drying state and used for the determination of most physical and chemical

properties.

4.1 Sampling and Preparation of Coal Sample

The coal sample for analysis test (hereinafter referred to as coal sample) is

taken according to GB/T 19494.1 or GB 474; and prepared according to GB/T

19494.2 or GB 475.

4.2 Preservation of Coal Sample

Moisture sample of coal shall be put in the non-absorbent and airtight sealed

container; general analysis test sample of coal shall be put in the tight vessel

after the sample reaches air-dried state.

4.3 Reserve Coal Sample

Reserve coal sample is taken separately in some stage of the original coal

sample preparation, and shall be in as less brokenness and division as possible

with the particle size and quality in accordance with the requirements of the

relevant standard(s).

5.1 Solution

As for the solution applied in the coal analysis test, all the solutions with water as

the solvent are referred as "aqueous solution" shortened as "solution"; as for the

solution with other liquids as the solvent, the solvent name is put before

"solution", e.g. the solution with ethyl alcohol (or benzene) as the solvent is

referred to as "ethyl alcohol (or benzene) solution".

5.2 Solution Concentration

The following are the commonly applied solution concentration in coal analysis

tests.

5.2.3 Mass concentration

The solute mass divided by solution volume, expressed by gram per liter or its

multiple, fraction unit, e.g. g /L, mg/ml.

5.2.4 Volume ratio or mass ratio

Volume ratio or mass ratio between one reagent and another reagent (or water,

expressed by (V1+V2) or (m1+m2), e.g.

6.1 Determination Times

Except special requirements, two times of determination (it is generally duplicate

determination) shall be conducted on the same coal sample in the analysis test

for each item. If the difference value of two determination values does not

exceed repeatability limit T, the arithmetic mean of the determination values

shall be taken as the final result;

6.2 Moisture Determination Term

6.2.1 The total moisture shall be determined after the coal sample preparation;

if the determination cannot be conducted immediately, the coal sample shall be

weighed accurately and placed in the vessel required in Section 4.2 before the

determination conducted as soon as possible.

7.1 Symbol for Result Expression

7.1.1 Item symbol

As for the coal analysis tests, the first letters or the abbreviations of the English

names for all the items of analysis tests are adopted, and the element symbols

or molecular formula of all the chemical constituents are taken as their

representative symbols.

7.1.2 Sub-item symbol

A further division of the item, expressed with the first letter or abbreviation of the

corresponding English name adopted and marked at the lower right hand corner

of the item symbol.

9.1 Test Record

The test record shall be filled according to the specified format, terms, symbols,

and legal measurement units and shall include the following contents at least.

Item name and record number for analysis test;

9.2 Test Report

The test report shall be filled according to the specified format, terms, symbols,

and legal measurement units and shall include the following contents at least.

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