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.

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.

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.

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

IPC: G01N27/416 ,  G01N21/80 ,  G01N27/30 ,  G01N31/00 ,  G01N31/22 ,  G01N33/18

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.

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.

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.

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

IPC: G01N21/78 ,  G01N33/18

CPC classification number: G01N21/78 ,  G01N33/18

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.

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.

公开(公告)号：US20230194522A1

公开(公告)日：2023-06-22

申请号：US18083656

申请日：2022-12-19

Applicant: HACH COMPANY

Inventor： Dan KROLL

IPC: G01N33/569 ,  G01N33/543 ,  G01N15/14 ,  G01N15/06

CPC classification number: G01N33/56911 ,  G01N33/54326 ,  G01N15/1404 ,  G01N15/06 ,  G01N2015/149 ,  G01N2015/1493 ,  G01N2015/0693 ,  G01N2015/1006

Abstract: Methods and kits are provided for analyzing a fluid with a flow cytometer to determine the concentration of a target component in the fluid. At least two bead groups are combined with the fluid, wherein each of the bead groups includes surface-functionalized beads that have a different size from the other bead groups. The target component can bind to the functional groups on the beads, and the beads with the targets can be counted with the flow cytometer. Based on the numbers of beads with targets in each group, a most probable number (MPN) of the target component can be determined.

公开(公告)号：US11549888B2

公开(公告)日：2023-01-10

申请号：US16592339

申请日：2019-10-03

Applicant: Hach Company

Inventor： Amit Das

IPC: G01N21/64 ,  G01N21/77 ,  G01N33/18 ,  G01N31/22 ,  C07D311/16

Abstract: An embodiment provides a method for measuring total chlorine in a seawater sample, including: preparing a thiocarbamate-based indicator; introducing the thiocarbamate-based indicator to a seawater sample, wherein the seawater sample contains an amount of total chlorine; adding an additive to the seawater sample, wherein the additive accelerates the reaction rate between the thiocarbamate-based indicator and total chlorine and causes a change in fluorescence of the seawater sample; and measuring the amount of total chlorine in the seawater sample by measuring an intensity of the fluorescence. Other aspects are described and claimed.