公开(公告)号：US20230228726A1

公开(公告)日：2023-07-20

申请号：US17580215

申请日：2022-01-20

Applicant: Hach Company

Inventor： Vishnu Vardhanan Rajasekharan ,  Cary Burton Jackson ,  Matthew Ryan Salzer ,  Dan Jonathan Kroll

IPC: G01N33/18 ,  G01N1/34 ,  G01N1/40 ,  G01N27/30

CPC classification number: G01N33/1826 ,  G01N1/34 ,  G01N1/4055 ,  G01N27/308 ,  G01N2001/4061 ,  G01N2001/4038

Abstract: An embodiment provides a method for deriving an amount of PFAS substances from a total organic fluoride measurement in a sample, including: removing inorganic fluoride from the sample using one or more of an ion exchange cartridge and an exclusion apparatus; preconcentrating, using a solid phase extraction, at least one PFAS substance in the sample; digesting, using a working electrode and a counter electrode, the at least one PFAS substance to an amount of total organic fluoride; and determining, using an analyzer, the amount of total organic fluoride in the sample. Other aspects are described and claimed.

公开(公告)号：US12163937B2

公开(公告)日：2024-12-10

申请号：US17580215

申请日：2022-01-20

Applicant: Hach Company

Inventor： Vishnu Vardhanan Rajasekharan ,  Cary Burton Jackson ,  Matthew Ryan Salzer ,  Dan Jonathan Kroll

IPC: G01N1/40 ,  G01N31/00 ,  G01N33/18

Abstract: An embodiment provides a method for deriving an amount of PFAS substances from a total organic fluoride measurement in a sample, including: removing inorganic fluoride from the sample using one or more of an ion exchange cartridge and an exclusion apparatus; preconcentrating, using a solid phase extraction, at least one PFAS substance in the sample; digesting, using a working electrode and a counter electrode, the at least one PFAS substance to an amount of total organic fluoride; and determining, using an analyzer, the amount of total organic fluoride in the sample. Other aspects are described and claimed.

公开(公告)号：US20240102960A1

公开(公告)日：2024-03-28

申请号：US17951777

申请日：2022-09-23

Applicant: Hach Company

Inventor： Vishnu Vardhanan Rajasekharan ,  Matthew Ryan Salzer ,  Russell Young ,  Benjamin James Walter ,  Jorge Gomez

IPC: G01N27/416 ,  G01N27/30

CPC classification number: G01N27/4163 ,  G01N27/308

Abstract: An embodiment provides a method for measuring an amount of total organic fluoride content of a PFAS containing sample, including: placing a sample comprising a PFAS compound in a measurement device, wherein the measurement device comprises an oxidation cell and a non-oxidation cell, wherein the oxidation cell comprises a boron-doped diamond electrode; measuring, using the measurement device, an amount of total inorganic fluoride of the sample before an oxidation; applying an electrical potential to a portion of the sample in the oxidation cell, wherein the electrical potential oxidizes the PFAS compound; measuring, using the measurement device, an amount of total organic fluoride of the sample after the oxidation to provide a measurement signal of the total organic fluoride; and determining a first derivative of the measurement signal of the total organic fluoride. Other aspects are described and claimed.