Measurement of trace ethylene glycol in oil

Details Measurement of trace ethylene glycol in oil Measurement of trace ethylene glycol in oil

1977-06-29

1978-11-14

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23230M, 252408, G01N 2126, G01N 3122, G01N 3328

Patent

active

041253736

ABSTRACT:
A method for determining ethylene glycol in motor oil in the range of about 10 to about 100 parts per million (ppm) in which ethylene glycol is extracted from an oil sample using water as extractant, the extracted ethylene glycol is oxidized with trisodium paraperiodate to form formaldehyde, the formaldehyde is condensed with 3-methyl-2-benzothiozilinone hydrazone hydrochloride (MBH), and ferric chloride then added to form a brilliant blue dye solution which indicates the presence initially of ethylene glycol. In a technique adapted for laboratory use the absorbance of the blue dye solution is measured spectrophotometrically at 630 nanometers (nm) and the measured absorbance is translated to a calibration of concentration of ethylene glycol in the oil sample.

REFERENCES:
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The 3-Methyl-2-benzothiazolone Hydrazone Test, Anal. Chem., vol. 33, No. 1, Jan. 1961, pp. 93-96.
ASTM Method D-2982-73, Detecting Glycol Based Antifreeze in Used Lubricating Oils.
Increasing Sensitivity of MBTH Test for Analysis of Alphatic Aldehydes in Air, Anal. Chem. vol. 36, 3/1964, pp. 679-681.

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