Patent ID: 11860140
Assignee: SUFFOLK COUNTY WATER AUTHORITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 21:
22. A method for facilitating the detection of PFAS analytes in a sample comprising:
obtaining a sample containing one or more PFAS analytes of formula CnF(2n+1)—X;
wherein:
n is 3, 4, 5, 6, 7, 8 or 9; and
—X is —SO3H, —CO2H, —SO3, or —CO2 

receiving data representative of test results of an analysis detecting at least one of the one or more PFAS analytes of formula CnF(2n+1)—X within at least a portion of the sample, the test results comprising one or both: i) the concentration of the at least one PFAS analyte in the sample; and ii) the amount within an injected volume of the sample of the at least one PFAS analyte into an LC/MS/MS system;
wherein:
i) the concentration of the at least one PFAS analyte within the sample is between approximately 0.0020 μg/L and approximately 0.25 μg/L; and/or
ii) the amount of the at least one PFAS analyte within the injected volume of the sample is between approximately 1.5×10−7 μg and approximately 1.9×10−5 μg;

wherein the analysis comprised the following steps a) and b):
a) injecting a volume of the sample into the LC/MS/MS system with ESI that is configured to detect the at least one PFAS analyte; and
b) subjecting the injected volume of the sample to ESI conditions that include a sheath gas flow of approximately 8 L/min to approximately 12 L/min.