GB/T 6324.2-2004Test method of organic chemical products -- Part 2: Determination of dry residue after evaporation on a water bath for volatile organic liquids (English PDF)

Foreword

GB/T 6324 Test method of organic chemical products consists of six parts.

- Part 1. Water miscibility test of liquid organic chemical products;

- Part 2. Determination of dry residue after evaporation on a water bath for

volatile organic liquids;

- Part 3. Determination of permanganate-reducing substances;

- Part 4. Determination of trace sulfur in organic liquid products -

Microcoulometric method;

- Part 5. Determination of trace quantities of carbonyl compounds in

organic chemicals;

- Part 6. Determination of color for liquids - Tristimulus colorimetry.

This Part is the second part of GB/T 6324.

This Part was redrafted on the basis of adopting ISO 759.1981 Volatile organic

liquids for industrial use--Determination of dry residue after evaporation on

water bath--General method (English version). Annex A lists the comparison on

clause number between this Part and ISO 759.1981.

Considering national conditions of China, this Part made some modifications

when adopting ISO 759.1981. The main difference is that it deleted Clause 8

Test report of ISO 759.1981.

This Part replaces GB/T 6324.2-1986 Volatile organic liquids--Determination of

dry residue after evaporation on a water bath--General method.

Compared with GB/T 6324.2-1986, the main changes are as follows.

- added the content of "warning" and clause of sampling (see Warning of

this Edition and Clause 5);

- modified "This Part is applicable to volatile organic liquid of which the

evaporation residue is not less than 5 mg/kg" to "This Part is applicable to

volatile organic liquid of which the amount of evaporation residue is

greater than or equal to 10 mg/kg [mass fraction is 0.001%]" (Clause 1 of

Edition 1986, Clause 1 of this Edition);

- modified "Heat the evaporation pan in the oven for 1 h and take it out.

Place it in a dryer and weigh after cooling for 45 min" to "Put the

evaporation pan in the oven and heat it for 2 h. Place it in a dryer and cool

to ambient temperature. Weigh it." (Clause 4 of Edition 1986, Clause 6 of

this Edition);

- modified "Heat the evaporation pan with residue in the oven for 2 h. Take

it out and place it in a dryer for 45 min cooling. Weigh it and put it into the

oven for 1 h heating. Place it into the dryer and cool it for 45 min. Weigh it

to constant mass" to "Heat the evaporation pan with residue in the oven

for 2 h. Take it out and place it in a dryer and cool to ambient temperature.

Weigh it. Repeat the above procedures until the mass is constant" (Clause

4 of Edition 1986, Clause 6 of this Edition);

- modified "the sample density used by result calculation at 20°C" to "the

density at test temperature" (Clause 5 of Edition 1986, Clause 7 of this

Edition);

- added the expression method of milligrams per liter (mg/L), milligrams per

kilogram (mg/kg), milligrams per 100 milliliters in the calculation of results

(see Clause 7).

Annex A of this Part is informative.

This Part was proposed by China Petroleum and Chemical Industry Association.

This Part shall be under the jurisdiction of Subcommittee on Organic, National

Technical Committee on Chemical of Standardization Administration of China

(SAC/TC 63 / SC 2).

The drafting organization of this Part. Beijing Research Institute of Chemical

Industry, China Petroleum & Chemical Corporation.

Main drafter of this Part. Hu Yanfeng.

This Part was issued in April 1986 for the first time.

Test method of organic chemical products - Part 2.

Determination of dry residue after evaporation on a

water bath for volatile organic liquids

WARNING Personnel who use this Standard shall have practical

experience in formal laboratory work. This Standard does not address all

possible safety issues. It is the user's responsibility to take appropriate

safety and health measures and to ensure compliance with the relevant

national regulations.

It should be noted that many products are volatile, flammable, reactive or

have toxic potential hazards; some solvents and chemical intermediates

such as ethers, unsaturated compounds in the storage may form peroxide;

the presence of peroxide can cause a strong explosion hazard. Therefore,

in the application of this test method, it shall carefully consider the

preventive measures to eliminate these potential hazards.

1 Scope

This Part of GB/T 3903 specifies a test method for determining volatile organic

chemical liquid products evaporated on a water bath after the dry residue.

This Part is applicable to volatile organic liquid of which the amount of

evaporation residue is greater than or equal to 10 mg/kg [mass fraction is

0.001%]. If the amount of evaporation residue is less than 10 mg/kg [mass

fraction is 0.001%], it shall increase the sampling amount appropriately.

2 Normative references

The following standards contain the provisions which, through reference in this

Part, constitute the provisions of this Part. For dated references, subsequent

amendments (excluding corrections) or revisions do not apply to this Part.

However, the parties who enter into agreement based on this Part are

encouraged to investigate whether the latest versions of these documents are

applicable. For undated reference documents, the latest versions apply to this

Part.

GB/T 4472 Determination of density and relative density for chemical

products

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