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公开(公告)号：US20250067711A1
公开(公告)日：2025-02-27
申请号：US18941328
申请日：2024-11-08
Applicant: HACH COMPANY
Inventor： Vishnu Vardhanan RAJASEKHARAN , Cary Burton JACKSON , Matthew Ryan SALZER , Dan Jonathan KROLL
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.
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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
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.
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公开(公告)号：US12044622B2
公开(公告)日：2024-07-23
申请号：US17986389
申请日：2022-11-14
Applicant: Hach Company
Inventor： Amit Das
IPC: G01N21/64 , G01N21/77 , C07D311/16 , C09B57/02
CPC classification number: G01N21/643 , G01N21/77 , C07D311/16 , C09B57/02 , G01N2021/6439 , G01N2021/6443 , G01N2021/7786 , Y10T436/173845 , Y10T436/193333
Abstract: An embodiment provides a method for measuring total chlorine in a solution, including: preparing a thiocarbamate indicator; introducing the thiocarbamate indicator to a solution, wherein the solution contains an amount of monochloramine; adding an additive to the solution, wherein the additive accelerates the reaction rate between the thiocarbamate indicator and monochloramine and causes a change in fluorescence of the solution; and measuring the amount of monochloramine in the solution by measuring an intensity of the fluorescence. Other aspects are described and claimed.
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公开(公告)号：US20240230609A1
公开(公告)日：2024-07-11
申请号：US18151161
申请日：2023-01-06
Applicant: HACH COMPANY
Inventor： Douglas ROYER , Melinda Buyck , Sarah Anciaux , Devin Maurer
IPC: G01N31/22 , C07C59/245 , C07C211/51 , G01N21/78
CPC classification number: G01N31/22 , C07C59/245 , C07C211/51 , G01N21/78
Abstract: A kit is described that can be used for measuring free chlorine in water. The kit includes a buffer with potassium maleate and an indicator. A method for measuring a concentration of free chlorine in a water system includes adding an indicator and a buffer with potassium maleate to a water sample collected from the water system, measuring a light absorbance of the water sample after the indicator and the buffer have been added to the water sample, and determining a concentration of the free chlorine in the water system based on the measured light absorbance.
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公开(公告)号：US20240210381A1
公开(公告)日：2024-06-27
申请号：US18601314
申请日：2024-03-11
Applicant: Hach Company
Inventor： Michael Jonathan Tschampl , Peter Michalski , Reece W. Hopkins , Frederik Nordahl
IPC: G01N33/487 , B01L3/00
CPC classification number: G01N33/48771 , B01L3/545 , B01L2200/16
Abstract: An embodiment provides a method for selecting a color for a chemistry or instrument based upon a parameter of a test, the method including: identifying a color corresponding to a parameter of a test for the parameter; selecting, if the color corresponding to the parameter has not previously been used for another parameter, the color for designating a chemistry or an instrument as corresponding to the parameter; selecting, if the color corresponding to the parameter has previously been used for another parameter, a different color other than the color for designating a chemistry or an instrument as corresponding to the parameter, wherein the selecting a color other than the color comprises identifying a color having a measure of change in visual perception of the different color against other previously selected colors a predetermined value from the other previously selected colors; and utilizing the selected colors for parameters across both chemistries and instruments that are utilized in tests for the parameters.
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Patent Agency Ranking
公开(公告)号：US12013368B2
公开(公告)日：2024-06-18
申请号：US17253474
申请日：2019-07-24
Applicant: HACH COMPANY
Inventor： Vishnu Rajasekharan , Russell Young , Richard Leggett , Seamus O'Mahony
CPC classification number: G01N27/4167 , G01N21/80 , G01N27/302 , G01N31/005 , G01N31/221 , G01N33/1846
Abstract: An embodiment provides a method for measuring at least one characteristic of an aqueous sample, including: introducing an aqueous sample into a measurement device comprising one or more electrodes; oxidizing a transition metal to produce a higher valent metal by applying an electrical potential between an anode and a cathode of the measurement device; oxidizing, using the higher valent metal as a catalyst, a material within the aqueous sample; measuring a characteristic of the aqueous sample based upon the oxidized material, using a measurement device selected from the group consisting of: an electrochemical measurement device and an optical measurement device; and optimizing the electrical potential and at least one reagent delivered to the measurement device based on the measurement of the characteristic. Other aspects are described and claimed.
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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.
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公开(公告)号：US20240011896A1
公开(公告)日：2024-01-11
申请号：US18344436
申请日：2023-06-29
Applicant: Hach Company
Inventor： Russell Paul Gorham , Nelson E. Dervaes
IPC: G01N21/25
CPC classification number: G01N21/251 , G01N2201/12
Abstract: An embodiment provides a method for measuring an analyte of a sample using a colorimeter, including: introducing the sample into a measurement chamber of the colorimeter, wherein the measurement chamber comprises an optical path from a light source to an optical sensor; identifying and waiting a sample settling period, wherein the sample settling period comprises a dynamic length of time, wherein the identifying comprises: measuring, using the optical sensor, a light throughput of the sample; and determining, based upon the measuring, the light throughput has reached a stable baseline; and obtaining a reference measurement of the sample when the stable baseline is reached. Other aspects are described and claimed.
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公开(公告)号：US11719645B2
公开(公告)日：2023-08-08
申请号：US17345359
申请日：2021-06-11
Applicant: Hach Company
Inventor： Douglas F. Royer
Abstract: An embodiment provides a method for measuring arsenic in a sample, showing marked increase in sensitivity over previous methods including: preparing a compound of metal-plated zinc and zinc; introducing the compound to an acidified sample, wherein the sample contains an amount of arsenic, wherein the compound reduces the amount of arsenic to produce arsine gas; wherein sufficient hydrogen gas is produced to purge the sample solution; wherein the arsine gas is completely purged from the sample and captured on a test pad, wherein the pad comprises mercuric bromide, wherein the capturing produces a color change of the pad; and measuring the amount of arsenic in the sample by measuring the color change of the pad. Other aspects are described and claimed.
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公开(公告)号：US11714059B2
公开(公告)日：2023-08-01
申请号：US17132527
申请日：2020-12-23
Applicant: Hach Company
Inventor： Corey Alan Salzer
IPC: G01N27/30
CPC classification number: G01N27/302 , G01N27/301 , G01N27/308
Abstract: An embodiment provides a method for measuring a characteristic of an aqueous sample, including: introducing the aqueous sample to a titration region and a reaction region of a measurement device, wherein the titration region comprises a pH electrode and a protonator electrode contacting a first portion of an aqueous sample, wherein the reaction region comprises a counter electrode contacting a second portion of the aqueous sample; placing an electrolyte reservoir in a state of electrical continuity with the titration region and the reaction region, wherein the electrolyte reservoir comprises a reference electrode, wherein the volume of the electrolyte reservoir comprises a large volume of an electrolyte; and determining a characteristic of the aqueous sample by measuring an electrochemical characteristic between the reference electrode and at least one of: the pH electrode and the counter electrode. Other aspects are described and claimed.
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