US 12,269,012 B2
Columns and methods of use for analytical standards and compounds
Thomas Jakschitz, Innsbruck (AT); Douglas T. Gjerde, Saratoga, CA (US); and Guenther Bonn, Zirl (AT)
Filed by Thomas Jakschitz, Innsbruck (AT); Douglas T. Gjerde, Saratoga, CA (US); and Guenther Bonn, Zirl (AT)
Filed on May 16, 2023, as Appl. No. 18/197,804.
Application 18/144,837 is a division of application No. 16/662,641, filed on Oct. 24, 2019, granted, now 11,656,209.
Application 18/197,804 is a continuation in part of application No. 18/144,837, filed on May 8, 2023, granted, now 11,998,893.
Claims priority of provisional application 62/750,596, filed on Oct. 25, 2018.
Prior Publication US 2023/0285937 A1, Sep. 14, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 20/30 (2006.01); B01J 20/282 (2006.01); B01J 20/283 (2006.01); B01J 20/284 (2006.01); B01J 20/285 (2006.01); G01N 30/04 (2006.01); G01N 30/38 (2006.01)
CPC B01J 20/3092 (2013.01) [B01J 20/282 (2013.01); B01J 20/283 (2013.01); B01J 20/284 (2013.01); B01J 20/285 (2013.01); G01N 30/38 (2013.01); G01N 2030/045 (2013.01); G01N 2030/382 (2013.01)] 6 Claims
 
1. A method of quantitating PFAS in a sample, comprising:
adsorbing PFAS in the sample to solid phase extraction media and PFAS standard compounds,
wherein the PFAS standard compounds are adsorbed to said solid phase media, and
wherein the solid phase extraction media is free of elution reagent;
eluting the PFAS and PFAS standard compounds from the solid phase extraction media with an elution solvent; and
analyzing the eluted PFAS, wherein the PFAS standard compounds are used as internal standards.