GB/T 18609-2011 (English Version) PDF

Standard No.: GB/T 18609-2011
Language: Chinese, Available in English version
Release Date: 2011
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 18609-2011
Replace: GB/T 18609-2001

Scope: WARNING: Personnel using this standard should 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 ensure compliance with the conditions stipulated in the relevant national laws and regulations. This standard specifies the method for determining the acid value of crude oil by potentiometric titration. This standard is applicable to the determination of acidic components in crude oil that can be dissolved in a mixed solvent of toluene and isopropanol. The dissociation constants of these acidic components in water should be greater than 10^-9; very weak acids with dissociation constants less than 10^-9 will not interfere. Salts with a hydrolysis constant greater than 10^-9 will participate in the reaction. The measuring range of acid value is 0.1mg/g～150mg/g. This standard applies to the determination of crude oil with a mass fraction of water less than 0.5%.

GB/T 18609-2011 Referenced Document

GB/T 4755 Microcator
GB/T 6682 Water for analytical laboratory use.Specification and test methods
GB/T 8929 Crude petroleum.Determination of water.Distillation method
SY/T 5317 Petroleum liquids. automatic pipeline sampling
SY/T 6520 Test method for dehydration of crude oil by autoclave*， 2014-10-15 Update

2011 GB/T 18609-2011 Determination of acid number of crude oil by potentiometric titration
2001 GB/T 18609-2001 Standard test method for acid number of crude oil by potentiometric titration