Methods of detecting perfluoroalkyl or polyfluoroalkyl substances
AssigneeShaw Industries Group, Inc.
InventorClay Hampton
Life of this patent
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Abstract
Methods of detecting the presence of one or more fluorinated compounds, including perfluoroalkyl or polyfluoroalkyl substance (PFAS), in a sample are provided. The methods include the steps of chemically treating a sample with an oxidizing agent, such as a persulfate solution or Fenton's reagent, collecting the fluorinated compounds, and detecting the fluorinated compounds using analytical methods.
Claims28
A method of detecting a presence of one or more perfluoroalkyl or polyfluoroalkyl substance (PFAS) compounds in a sample, comprising:
- a) treating the sample with an oxidizing agent to form a mixture, wherein the oxidizing agent in step a) is a persulfate;
- b) maintaining the mixture for a reaction time at a reaction temperature, wherein the reaction time is from about 6 h to about 48 h and the reaction temperature is from about 50° C. to about 100° C.;
- c) collecting fluorinated compounds formed by oxidation of the one or more PFAS compounds in steps a) and b) in an aqueous mixture;
- and
- d) detecting the fluorinated compounds by a process comprising subjecting the mixture obtained in step c) to EPA method 537.1 or EPA method 1633;
- wherein at least some of the fluorinated compounds detected in step d) are different from fluorinated compounds detected by a second method that does not comprise steps a) to c).
A method of detecting a presence of one or more perfluoroalkyl or polyfluoroalkyl substance (PFAS) compounds in a yarn or fiber sample, comprising:
- a) treating the sample with an oxidizing agent to form a mixture, wherein the oxidizing agent in step a) is a persulfate;
- b) maintaining the mixture for a reaction time at a reaction temperature, wherein the reaction time is from about 6 h to about 48 h and the reaction temperature is from about 50° C. to about 100° C.;
- c) collecting fluorinated compounds formed by oxidation of the one or more PFAS compounds in steps a) and b) in an aqueous mixture;
- and
- d) detecting the fluorinated compounds by a process comprising subjecting the mixture obtained in step c) to EPA method 537.1 or EPA method 1633;
- wherein at least some of the fluorinated compounds detected in step d) are different from fluorinated compounds detected by a second method that does not comprise steps a) to c).
A method of detecting a presence of one or more perfluoroalkyl or polyfluoroalkyl substance (PFAS) compounds in a sample, comprising:
- a) treating the sample with an oxidizing agent to form a mixture, wherein the oxidizing agent in step a) is a Fenton's reagent;
- b) maintaining the mixture for a reaction time at a reaction temperature;
- wherein step b) further comprises cooling the mixture to a first reaction temperature and then heating the mixture to a second reaction temperature;
- c) collecting fluorinated compounds formed by oxidation of the one or more PFAS compounds in steps a) and b) in an aqueous mixture;
- and
- d) detecting the fluorinated compounds by a process comprising subjecting the mixture obtained in step c) to EPA method 537.1 or EPA method 1633;
- wherein at least some of the fluorinated compounds detected in step d) are different from fluorinated compounds detected by a second method that does not comprise steps a) to c).
A method of detecting a presence of one or more perfluoroalkyl or polyfluoroalkyl substance (PFAS) compounds in a yarn or fiber sample, comprising:
- a) treating the sample with an oxidizing agent to form a mixture, wherein the oxidizing agent in step a) is a Fenton's reagent;
- b) maintaining the mixture for a reaction time at a reaction temperature;
- wherein step b) further comprises cooling the mixture to a first reaction temperature and then heating the mixture to a second reaction temperature;
- c) collecting fluorinated compounds formed by oxidation of the one or more PFAS compounds in steps a) and b) in an aqueous mixture;
- and
- d) detecting the fluorinated compounds by a process comprising subjecting the mixture obtained in step c) to EPA method 537.1 or EPA method 1633;
- wherein at least some of the fluorinated compounds detected in step d) are different from fluorinated compounds detected by a second method that does not comprise steps a) to c).
Dependencies are inferred from the claim text.