Method to determine trace amounts of crude oil by spectroscopic absorption
US9297747B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2013 |
| Grant date | Mar 29, 2016 |
| Priority date | — |
| Expiry date | Mar 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/4061
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a method for determining trace amounts of crude oil in water, including the steps of collecting a sample of an oil-containing fluid, adding a toluene extraction volume to the sample, perturbing the sample, dissolving substantially all of the amount of oil in the toluene extraction volume to create a mixed sample, extracting the mixed sample to create an oil-in-toluene layer and an aqueous fluid layer, removing a portion of the oil-in-toluene layer into a dilution container, diluting the portion of the oil-in-toluene layer with a toluene dilution volume to create a dilute sample, measuring an absorption value of the dilute sample using a spectrophotometer, and comparing the absorption value to a calibration curve to quantify the amount of oil in the oil-containing fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.