US 11,788,952 B2
Determining concentration of oil in water by extraction
Nagoorpitchai S. Meeranpillai, Al-Khobar (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Feb. 25, 2022, as Appl. No. 17/681,406.
Prior Publication US 2023/0273117 A1, Aug. 31, 2023
Int. Cl. G01N 21/31 (2006.01); G01N 1/34 (2006.01); G01N 1/38 (2006.01); G01N 1/40 (2006.01); G01N 33/18 (2006.01)
CPC G01N 21/31 (2013.01) [G01N 1/34 (2013.01); G01N 1/38 (2013.01); G01N 1/4077 (2013.01); G01N 33/1833 (2013.01); G01N 2001/4083 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for determining a concentration of oil in a water sample, the method comprising:
adding a specified amount of cyclohexane to the water sample to form a mixture, wherein a volumetric ratio of the specified amount of cyclohexane to the water sample is in a range of from about 1:10 to about 1:1;
stirring the mixture;
extracting an oil phase from the mixture;
measuring an absorbance value of the extracted oil phase at a specified wavelength in the visible light spectrum, wherein the specified wavelength is in a range of from 390 nanometers (nm) to 600 nm; and
determining the concentration of oil in the water sample based on the measured absorbance value of the extracted oil phase.