Chloride measurement using non-harsh reagents

Patent metadata

Field	Value
Publication number	US-10670573-B2
Application number	US-201715714455-A
Country	US
Kind code	B2
Filing date	Sep 25, 2017
Priority date	Sep 25, 2017
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

An embodiment provides a method for measuring ions in a solution, including: preparing a measurement device comprising an active indicator, wherein the active indicator comprises a silver complex; introducing the measurement device to a solution, wherein the silver complex reacts with the solution and generates a precipitation comprising one of the elements selected from the group consisting of: silver chloride, silver sulfide, and mixtures thereof; and measuring an amount of one of the elements selected from the group consisting of: chloride and sulfide, in the solution, wherein the measuring comprises identifying a peak of the precipitation on a portion of the measurement device and comparing the peak to a measurement chart.

First claim

What is claimed is:

1. A method for measuring ions in a solution, comprising:
preparing a measurement device comprising an active indicator, wherein the active indicator comprises a silver complex, wherein the measurement device comprises a carrier matrix comprising filter paper sandwiched between two pieces of film or plastic and wherein the active indicator is impregnated onto the filter paper;
introducing the measurement device to a solution, wherein the silver complex reacts with the solution and generates a precipitation comprising one of the elements selected from the group consisting of: silver chloride, silver sulfide, and mixtures thereof; and
measuring an amount of one of the elements selected from the group consisting of: chloride and sulfide, in the solution, wherein the measuring comprises identifying a peak of the precipitation on a portion of the measurement device and comparing the peak to a measurement chart.

2. The method of claim 1 , wherein the measuring an amount comprises measuring an amount of chloride.

3. The method of claim 1 , wherein the silver complex comprises a silver tungstate complex.

4. The method of claim 3 , wherein the silver tungstate complex further comprises silver oxide and manganese oxide.

5. The method of claim 4 , wherein the measurement device comprises a carrier matrix comprising a colored background and wherein the precipitation produces a white precipitation peak.

6. The method of claim 1 , wherein the silver complex comprises a silver molybdate complex.

7. The method of claim 1 , wherein the precipitation comprises silver sulfide and wherein the measurement device comprises a carrier matrix comprising a white background and wherein the precipitation produces a dark precipitation peak.

8. The method of claim 1 , wherein the measurement device comprises a vial and wherein the silver complex comprises at least one solid contained within the vial.

9. The method of claim 1 , wherein the measuring an amount comprises measuring an amount of sulfide.

10. The method of claim 1 , wherein the measurement chart is operatively coupled to the measurement device.

11. A measurement device, comprising:
filter paper sandwiched between two pieces of film or plastic;
an active indicator impregnated onto the filter paper, wherein the active indicator comprises a silver complex;
wherein the active indicator reacts with a solution introduced to the measurement device and generates a precipitation comprising one of the elements selected from the group consisting of: silver chloride, silver sulfide, and mixtures thereof; and
a measurement chart, wherein the measurement chart identifies an amount of one of the elements selected from the group consisting of: chloride and sulfide, in the solution, by comparing a peak of the precipitation on a portion of the measurement device to the measurement chart.

12. The measurement device of claim 11 , wherein the measurement chart identifies an amount of chloride.

13. The measurement device of claim 11 , wherein the silver complex comprises a silver tungstate complex.

14. The measurement device of claim 13 , wherein the silver tungstate complex further comprises silver oxide and manganese oxide.

15. The measurement device of claim 11 , wherein the precipitation comprises silver sulfide and wherein the measurement device comprises a carrier matrix comprising a colored background and wherein the precipitation produces a white precipitation peak.

16. The measurement device of claim 11 , wherein the silver complex comprises a silver molybdate complex.

17. The measurement device of claim 16 , wherein the measurement device comprises a carrier matrix comprising a white background and wherein the precipitation produces a dark precipitation peak.

18. The measurement device of claim 11 , wherein the measurement device comprises a vial and wherein the silver complex comprises at least one solid contained within the vial.

19. The measurement device of claim 11 , wherein the measurement chart identifies an amount of sulfide.

20. A method for measuring chloride ions in a solution, comprising:
preparing a measurement device comprising a carrier matrix impregnated with an active indicator, wherein the active indicator comprises a silver tungstate complex, the carrier matrix comprising filter paper sandwiched between two pieces of film or plastic;
introducing the measurement device to a solution, wherein the silver tungstate complex reacts with the solution and generates a precipitation comprising silver chloride; and
measuring an amount of chloride in the solution, wherein the measuring comprises identifying a peak of the precipitation on a portion of the measurement device and comparing the peak to a measurement chart operatively coupled to the measurement device.

Assignees

• Hach Co

Inventors

• Kidd Iv Arnold Bertron

Classifications

• G01N31/02

  using precipitation {(measuring deposition or liberation of materials from an electrolyte G01N27/42)} · CPC title

• G01N31/22

  using chemical indicators (G01N31/02 takes precedence) · CPC title

• G01N33/182 Primary

  Specific anions in water · CPC title