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C18 Sep-Pak cartridges (1 cm3, 50 mg) were obtained from Waters Corporation (Milford, MA) and pre-washed with ethanol followed by deionized (DI) water prior to use.
Briefly, Supelclean LC-18 SPE cartridges (1 mL, 100 mg; Sigma-Aldrich, St . Louis MO, U.S.A).
Bond Elut C8 SPE cartridges (1 mg/100 mg) were purchased from Varian/Sample Preparation Products (Harbor City, CA, USA).
Oasis HLB solid-phase extraction (SPE) syringe barrel cartridges (1 mL, 30 mg sorbent) and Oasis HLB μelution SPE plates were purchased from Waters (Elstree, UK).
The concentrated and desalted lysate was subsequently loaded on a CM column (Econo-Pac CM cartridges, 1 ml, Biorad, Hercules, CA, USA).
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The tiny Rev cartridges (3 by 3 by 0.4 inch) are built differently.
A custom-made three-position input impedance switch provides for 47 k ohm MM cartridges, 100 ohm MC cartridges and 47 k ohm MC".
While chloride, sulfate, and carbonate can be removed with SPE cartridges [1], nitrate remains in the sample and could interfere with the perchlorate peak.
Bond Elut C18 Solid phase extraction (SPE) cartridges (500 mL/6 mL), Bond NH2 SPE cartridges (500 mL/3 mL), Poly-Sery HLB SPE cartridges (60 mL/3 mL) and Bond Carbon-GCB SPE cartridges (250 mL/3 mL) were purchased from CNW, (Shanghai, China).
QMA (WAT023525) and silica cartridges (WAT020520 and WAT043400) were purchased from Waters (Milford, MA, USA).
Base-modified silica cartridges 70 ml/10 g were sourced from Biotage (Uppsala, Sweden).
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