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公开(公告)号：US11231368B2
公开(公告)日：2022-01-25
申请号：US16425173
申请日：2019-05-29
Applicant: Hach Company
Inventor： Amit Das
Abstract: An embodiment provides a method for measuring sulfite in a solution, including: preparing a hemicyanine indicator; introducing the hemicyanine indicator to a solution containing an amount of sulfite, wherein the hemicyanine indicator reacts with the sulfite and causes a change in fluorescence of the solution; and measuring the amount of sulfite 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：US20210341418A1
公开(公告)日：2021-11-04
申请号：US16864675
申请日：2020-05-01
Applicant: Hach Company
Inventor： Corey Alan Salzer , Ralf Leidner
IPC: G01N27/416 , G01N27/48 , G01N27/30 , G01N27/38
Abstract: An embodiment provides a method for measuring total oxidant in a seawater sample, comprising: forming a seawater solution and a formed iodine by introducing a buffer and an iodide reagent to a seawater sample, wherein the seawater sample contains an amount of oxidant; placing the seawater solution in a measurement device, wherein the measurement device comprises a boron doped diamond working electrode reacting with the seawater solution and the formed iodine, wherein an electrochemical process reduces the formed iodine to iodide; and measuring the amount of total oxidant in the seawater sample by measuring, using the measurement device, an amount of iodide in the seawater sample. Other aspects are described and claimed.
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公开(公告)号：US20210172431A1
公开(公告)日：2021-06-10
申请号：US16704897
申请日：2019-12-05
Applicant: Hach Company
Inventor： Jordan Vin Raviv , Nelson E. Dervaes
Abstract: An embodiment provides a self-lubricating linear peristaltic pump for delivering precise volumes of fluid, including: a housing comprising a slide area; at least one pinch block located within the slide area of the housing, wherein the at least one pinch block comprises a base end and a face end; a plurality of compression blocks located within the slide area of the housing, wherein each of the plurality of compression blocks comprises a base end and a face end; a cam located within the housing, wherein the mechanically contacts the base end of each of the at least one pinch block and the base end of each of the plurality of compression blocks; a motor mechanically coupled to the cam, wherein the motor moves the cam upon operation of the motor; and at least one tube in contact with the face end of each of the at least one pinch block and the face end of each of the plurality of compression blocks. Other aspects are described and claimed.
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Patent Agency Ranking
公开(公告)号：US11029280B2
公开(公告)日：2021-06-08
申请号：US15745586
申请日：2017-06-22
Applicant: HACH COMPANY
Inventor： Dan Kroll , Corey Salzer
Abstract: An embodiment provides a method for determining the alkalinity of an aqueous sample using an alkalinity sensor, including: monitoring the pH of an aqueous sample using a pH sensor in a sample cell, the pH sensor including a pH sensor electrode made of boron-doped diamond; generating hydronium ions, using a hydronium generator, in the aqueous sample in the sample cell, the hydronium generator including a hydronium-generating electrode; changing the pH of the aqueous sample by causing the hydronium generator to generate an amount of hydronium ions in the aqueous sample; quantifying and converting a current or charge to the number of hydronium ions produced to an end point of the electrochemical titration, the end point correlating to the alkalinity of a sample; and analyzing the alkalinity of the aqueous sample based on the generated amount of hydronium ions and the resulting change in pH monitored by the pH sensor.
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公开(公告)号：US20210123898A1
公开(公告)日：2021-04-29
申请号：US16667714
申请日：2019-10-29
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring nitrate in an aqueous sample, including: introducing an aqueous sample containing an amount of nitrate to a cation exchange resin; flowing the aqueous sample over copper metal; adding a reducing reagent to the aqueous sample; adding a colorimetric indicator to the aqueous sample; and measuring the amount of nitrate in the aqueous sample by measuring a change in intensity of the absorbance. Other aspects are described and claimed.
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公开(公告)号：US20200333304A1
公开(公告)日：2020-10-22
申请号：US16387191
申请日：2019-04-17
Applicant: Hach Company
Inventor： Angella Nicholle Greenawalt
IPC: G01N31/22
Abstract: An embodiment provides A method for measuring fluoride concentration in an aqueous solution, including: preparing a metal-ligand complex, wherein the metal-ligand complex comprises chromeazurol S and aluminum; placing the metal-ligand complex in a sample containing fluoride, wherein the placing generates a color change by releasing the chromeazurol S from the metal-ligand complex; and measuring, using colorimetric techniques, a concentration of fluoride within the sample, wherein the measuring comprises measuring an absorbance wavelength of a colorimetric ligand. Other embodiments are described and claimed.
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公开(公告)号：US10794883B2
公开(公告)日：2020-10-06
申请号：US16277397
申请日：2019-02-15
Applicant: Hach Company
Inventor： Melanie Ann Roth , Angella NIcholle Greenawalt
Abstract: An embodiment provides a method for measuring aluminum concentration in an aqueous sample, including: preparing a chromeazurol S indicator solution; placing the chromeazurol S indicator solution in a sample containing aluminum, wherein the placing causes the chromeazurol S to chelate aluminum within the sample creating a colored complex; and measuring, using colorimetric techniques, a concentration of aluminum within the sample, wherein the measuring comprises measuring an absorbance at a wavelength for the colored complex. Other embodiments are described and claimed.
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公开(公告)号：US20200264145A1
公开(公告)日：2020-08-20
申请号：US16277397
申请日：2019-02-15
Applicant: Hach Company
Inventor： Melanie Ann Roth , Angella Nicholle Greenawalt
Abstract: An embodiment provides a method for measuring aluminum concentration in an aqueous sample, including: preparing a chromeazurol S indicator solution; placing the chromeazurol S indicator solution in a sample containing aluminum, wherein the placing causes the chromeazurol S to chelate aluminum within the sample creating a colored complex; and measuring, using colorimetric techniques, a concentration of aluminum within the sample, wherein the measuring comprises measuring an absorbance at a wavelength for the colored complex. Other embodiments are described and claimed.
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