Petroleum and related products. Determination of the oxidation stability and corrosivity of fire-resistant phosphate ester fluids

2015 ◽  
Keyword(s):  
Oxidation Stability ◽  
Phosphate Ester

Micro-Determination of p-Hydroxybenzoic Esters in Pharmaceuticals and Cosmetics

1977 ◽  
Vol 60 (1) ◽  
pp. 56-59 ◽  
Author(s):  
Emil Weisenberg ◽  
Baruch Gershon ◽  
Judith Schoenberg
Keyword(s):  
Liquid Chromatography ◽  
Phosphate Ester ◽  
Specific Method ◽  
Gas Liquid Chromatography ◽  
Direct Extraction ◽  
Flame Photometric Detector ◽  
Phenol Derivatives ◽  
Margin Of Error ◽  
Diethyl Phosphate

Abstract A rapid and specific method is described for the determination of microamounts of methyl, propyl, and butyl p-hydroxybenzoic esters (parabens) in pharmaceuticals and cosmetics. The method involves the direct extraction of parabens into benzene or chloroform followed by derivatization with phosphorochloridate. The diethyl phosphate ester derivatives are cleaned up on a Florisil minicolumn and finally measured by gas-liquid chromatography on 5% OV-210 on Gas-Chrom Q. A flame photometric detector or a KCl thermionic detector may be used. The concentration response was linear up to 40 ng parabens. The reproducibility and margin of error were tested with fortified samples. This method may be applied to the estimation of other phenol derivatives.

Research Progress for Determination of the Antioxidant Content in Transformer Oil

2014 ◽  
Vol 543-547 ◽  
pp. 1157-1160 ◽  
Author(s):  
Chen Yao Liu ◽  
Na Na Wang ◽  
Yun Guang Huang ◽  
Wei Wei Yu ◽  
Li Ping Zhu ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Oxidation Stability ◽  
Development Trend ◽  
Electric Arc ◽  
Transformer Oil ◽  
Research Progress ◽  
Oil Oxidation ◽  
Electrochemical Test ◽  
The Development Trend

Under the actions of dissolved oxygen, temperature, electric field, electric arc, moisture, impurities and metal catalysts, transformer oil in operation will undergo oxidation and cracking, which may result in production of large quantities of peroxides, alcohols, aldehydes, ketones and acids. To improve the oxidation stability of oil, the antioxidants should be added into the transformer oil before operation. This paper mainly introduced the oxidation process of transformer oil, the harm of transformer oil oxidation and the method for the determination of the T501 antioxidants content in transformer oil. It also forecast the development trend of the electrochemical test in the determination of T501 antioxidants content.

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