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GB/T 258-2025 (GB/T 258-1977) PDF English

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GB/T 258-1977: Determination of acidity of gasoline, kerosene and diesel fuels
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GB/T 258: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivery	Name of Chinese Standard	Status
GB/T 258-2025	English	279	Add to Cart	3 days	Determination of acidity of light petroleum products	Valid
GB/T 258-2016	English	119	Add to Cart	3 days	Standard test method for determination of acidity of light petroleum products	Valid
GB/T 258-1977	English	70	Add to Cart	0-9 seconds. Auto-delivery	Determination of acidity of gasoline, kerosene and diesel fuels	Obsolete

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GB/T 258-1977: Determination of acidity of gasoline, kerosene and diesel fuels

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA GB/T 258-77 (confirmed in 1988) Replacing GB 258-64 Gasoline, kerosene, diesel fuels – Determination of acidity Issued on: NOVEMBER 8, 1977 Implemented on: JANUARY 1, 1978 Issued by. State Standard Metrological Bureau

1 Method Summary... 3 2 Apparatuses... 3 3 Reagents... 3 4 Test Procedure... 4 5 Calculation... 5 6 Precision... 5 7 Report... 5 Additional Information... 6 Gasoline, kerosene, diesel fuels – Determination of acidity This method is applicable to the determination of acidity of gasoline, kerosene and diesel that are not added with ethyl-fluid.

1 Method Summary

1.1 This method uses the boiling ethanol to extract the organic acid from the sample; then uses potassium hydroxide ethanol solution to titrate. 1.2 The milligram-number of potassium hydroxide that is required to neutralize 100 ml of petroleum product is called acidity.

2 Apparatuses

2.1 Erlenmeyer flask. 250 ml. 2.2 Spherical reflux condenser. length is about 300 mm. 2.3 Cylinder. 25, 50 and 100 ml. 2.4 Microburette. 2 ml, indexing is 0.02 ml; or 5 ml, indexing is 0.05 ml. 2.5 Electric hot plate or water bath.

3 Reagents

3.1 95% ethanol. analytical pure. Refined Ethanol. After treated by silver nitrate and potassium hydroxide solution, then go through sedimentation and distillation. 3.2 Potassium hydroxide. analytical pure, prepare into 0.05N potassium hydroxide ethanol solution. 3.3 Basic Blue 6B. When preparing the solution, weigh 1g of basic blue, accurate to 0.01 g. Then add it to 50 ml of boiling 95% ethanol; reflux for 1 hour in a water bath; cool down and filter it. If necessary, the clear filtrate that has been cooked to hot shall be neutralized by 0.05N potassium hydroxide ethanol solution or 0.05N hydrochloric acid solution, until Additional Information. This Standard was proposed by the Ministry of Petroleum and Chemical Industry of the People's Republic of China. This Standard was drafted by the Research Institute of Petroleum and Chemical Science Academy. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.