US 11,726,033 B1
Determination of total crude oil in water by absorbance spectrophotometry
Mohammad Alharthy, Al-Khobar (SA); Osama Alzahrani, Dammam (SA); Nada Alghamdi, Dharan (SA); NagoorPitchal MeeranPillai, Al-Khobar (SA); and Ali Almuhaimeed, Al-Qatif (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Feb. 28, 2022, as Appl. No. 17/682,243.
Int. Cl. G01N 21/33 (2006.01); G01N 33/18 (2006.01); G01N 1/40 (2006.01)
CPC G01N 21/33 (2013.01) [G01N 1/4077 (2013.01); G01N 33/1833 (2013.01); G01N 2001/4083 (2013.01); G01N 2201/127 (2013.01); G01N 2201/12746 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for quantifying a crude oil in water, comprising:
selecting an ultraviolet/visible (UV/Vis) wavelength to perform a measurement;
preparing calibration solutions in xylene;
preparing a calibration curve from the calibration solutions;
preparing a sample comprising extracting the crude oil from the water in a two-phase separation with xylene;
measuring an absorbance of the sample in the xylene at the UV/Vis wavelength; and
calculating a concentration of the crude oil in the water from the absorbance.