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GB/T 11079-2015 (GB/T11079-2015)

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GB/T 11079-2015: PDF in English (GBT 11079-2015)

GB/T 11079-2015
ICS 75.140
D 21
Replacing GB/T 11079-2000
Test Method for Carbonizable
Substances in White Mineral Oil
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
Table of Contents
Foreword ... 3 
1 Application Scope ... 5 
2 Normative References ... 5 
3 Summary of Test Method ... 5 
4 Significance and Use ... 5 
5 Apparatus ... 6 
6 Reagents ... 7 
7 Preparation of Basic Solutions and Colorimetric Reference Standard
Solution ... 9 
8 Test Procedure ... 10 
9 Interpretation and Reporting of Results ... 10 
10 Precision and Bias ... 11 
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 11079-2000, Standard Test Method for Carbonizable
Substances in White Mineral Oil. Compared with GB/T 11079-2000, the main changes
are as follows.
-- it changes the standard name;
-- it adds the normative references GB/T 601 and GB 4853 (see Article 2);
-- it adds the contents of safety warnings (see 6.2, 6.3, 6.4, 6.9, 6.15 and 8.3);
-- it adds “slowly add the acid to the water” (see 6.2, 6.3 and 6.4);
-- it rounds off some numerical values and adds tolerances (see 7.1, 7.2 and 7.3;
6.1, 6.2 and 6.3 of edition 2000);
-- it adds using a nonchromium containing, strongly oxidizing cleaning solution to
wash test tube (see 8.1); and
-- it deletes “cover up with the stopper rapidly and use distilled water to seal the
opening” in the preparation of basic solution (6.1, 6.2 and 6.3 of edition 2000).
This Standard was redrafted by modifying and adopting ASTM D565-99 (2013),
Standard Test Method for Carbonizable Substances in the White Mineral Oil (English
version). In consideration of the national conditions of China, some modifications are
made for this Standard when adopting the standard. The main differences between
this Standard and ASTM D565-99(2013).
-- English units are deleted in this Standard;
-- Chinese national standards are used as reference standards in this Standard;
-- reagents of analytical purity and above are used in this Standard;
-- standard layout is re-arranged in accordance with the national conditions of China
and the standard formats; and
-- the test tube washing procedures and expression of test results are detailed in
this Standard to improve operability.
This Standard was proposed by and shall be under the jurisdiction of China National
Standardization Technical Committee on Petroleum Products and Lubricants (SAC/TC
The drafting organization of this Standard. SINOPEC Fushun Research Institute of
Petroleum and Petrochemicals.
Test Method for Carbonizable
Substances in White Mineral Oil
Warning. This standard may involve certain hazardous materials,
equipment and operations, but it does not purport to address all of the
safety concerns, if any, associated with its use. It is the responsibility of
the user of this Standard to establish appropriate safety and health
practices and determine the applicability of regulatory limitations prior to
1 Application Scope
This Standard specifies the method for the test of carbonizable substances in white
mineral oil.
This Standard applies to white mineral oil.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 601, Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 4853, Food Grade White Oil
GB/T 6682, Water for Analytical Laboratory Use – Specification and Test Methods
3 Summary of Test Method
The mineral oil is treated with concentrated sulfuric acid (H2SO4) under prescribed
conditions and the resulting color is compared with a reference standard to determine
whether it passes or fails the test.
4 Significance and Use
This test method is a means for ascertaining whether white mineral oil conforms to the
product quality standards, e.g. it is required to test carbonizable substances in the
product specifications of GB 4853.
1.3 of the volumes of sulfuric acid to distilled water (Slowly add the acid to the water
and use after cooling down). Nitrogen-free test. Use the same volume of distilled water
to dilute the sulfuric acid to be tested and cool down; take 10 mL of the sulfuric acid
solution cooled down, gently overlay on 10 g/L of diphenylamine-sulfuric acid solution,
and do not mix up. A blue color should not appear at the zone of contact within 1 h.
This test detects as little as 0.0002 % (mass fraction) nitric acid (HNO3).
6.3 Hydrochloric acid – Analytical purity, with a concentration 36% to 38% (mass
fraction) (Warning – Causes burns. Vapor extremely irritating). Prepare diluted
hydrochloric acid in accordance with the proportion of 1. 39 of the volumes of
hydrochloride acid to water (Slowly add the acid to the water).
6.4 Glacial acetic acid – Analytical purity, with a concentration greater than 99%
(mass fraction) (Warning – Corrosive. Vapor irritating).
6.5 Hydrogen peroxide – Analytical purity, prepared 3% (mass fraction) hydrogen
peroxide aqueous solution.
6.6 Cupric sulfate (CuSO4·5H2O) – Analytical purity.
6.7 Cobaltous chloride (CoCl2·6H2O) – Analytical purity.
6.8 Ferric chloride (FeCl3·6H2O) – Analytical purity.
6.9 Sodium hydroxide – Analytical purity (Warning—Corrosive. Can cause severe
burns or blindness. Evolution of heat produces a violent reaction or eruption
upon too rapid a mixture with water); mix 5 g of sodium hydroxide and 20 mL of
distilled water to prepare sodium hydroxide solution (1.4).
6.10 Potassium iodide – Analytical purity.
6.11 Diphenylamine – Analytical purity. Dissolve 1 g of diphenylamine into 100 mL of
concentrated sulfuric acid of mass fraction 95% to 98% to make a sulfuric acid 10 g/L.
6.12 Soluble starch – Analytical purity. Prepare an aqueous solution 10 g/L as the
6.13 Methyl orange indicator – Analytical purity. Prepare an aqueous solution 5 g/L.
6.14 Sodium thiosulfate – Analytical purity. Prepare and demarcate the sodium
thiosulfate solution 0.1 mol/L in accordance with GB/T 601.
6.15 Cleaning solution – Chromic acid (H2CrO4) cleaning solution (Warning—
Causes severe burns. A recognized carcinogen. Strong oxidizer.).
6.16 Reference white oil – White oil number 10 or 15, in accordance with the
requirements of GB 4853 or equivalent.
9.2 If the oil layer is discolored or if the acid layer is darker than the reference
standard colorimetric solution, white mineral oil shall be reported as not passing the
9.3 If the results of two repeated tests are different, carry out a third test and take two
same test results as the test result of the specimen.
10 Precision and Bias
No statement is made about either the precision or bias of this test method since the
result merely states whether there is conformance to the criteria for success specified
in the procedure.
(Above excerpt was released on 2017-04-12, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT11079-2015