Method and system for determining residual chlorine or chloramine concentration in solution by colorimetey

• US 20090047743A1
• Filed: 09/07/2008
• Published: 02/19/2009
• Est. Priority Date: 09/07/2008
• Status: Active Grant

• Current Assignee: Nooshin Mirkheshty, Sayyed Ali Alavi
• Original Assignee: Nooshin Mirkheshty, Sayyed Ali Alavi
• Inventors: Mirkheshty, Nooshin, Alavi, Sayyed Ali
• Granted Patent: US 8,183,051 B2
• Time in Patent Office: Days
• US Class Current: 436/43
• CPC Class Codes: G01N 21/78 producing a change of colour
• CPC Class Codes: Y10T 436/11 Automated chemical analysis
• CPC Class Codes: Y10T 436/17 Nitrogen containing
• CPC Class Codes: Y10T 436/173845 Amine and quaternary ammonium
• CPC Class Codes: Y10T 436/19 Halogen containing
• CPC Class Codes: Y10T 436/193333 In aqueous solution

Abstract

A kit for determining residual chlorine or chloramine amount of a sample; comprising: a means for containing a PVA solution as an indicator, and another means for containing a reducing indicator. Said reducing indicator would be oxidized by a reaction with residual chlorine or chloramine and said PVA indicator induces a dye by reaction with oxidized compound such as free iodine; wherein intensity of said dye would be changed depending upon the residual chlorine or chloramine amount of the sample.

Claims

1. A kit for determining residual chlorine or chloramine amount in a sample wherein said kit comprises an effective amount of polyvinyl alcohol for preparation of an indicator.

2. The kit as claimed in claim 1, wherein said kit comprises at least a means for containing a source of a reducing agent for preparation of an indicator, and a source of polyvinyl alcohol in form of solution for preparation of another indicator and wherein said reducing agent being oxidized by residual chlorine or chloramine and wherein said PVA indicator forming a dye by a reaction with the oxidized compound and wherein intensity of said dye being changed depending upon the residual chlorine or chloramine amount of said sample.

3. The kit as claimed in claim 2, wherein said source of reducing agent is an iodide containing compound as an iodide indicator.

4. The kit as claimed in claim 2, wherein said kit comprising:

(a) Means for containing an iodide indicator and a polyvinyl alcohol indicator, wherein all said indicators are mixed with said sample; and

wherein intensity of said dye being changed depending upon concentration of residual chlorine or chloramine in said sample;

(b) Means for scaling colors for a colorimetric analysis having a plurality of predetermined color intensities wherein each of said predetermined color intensity represents different residual chlorine or chloramine amount of the sample so that said residual chlorine or chloramine amount of said sample is determined by comparing said intensity of said dye with said predetermined color intensities.

5. The kit as claimed in claim 1, wherein said sample is selected from a group comprising of pool water or drinking water.

6. The kit as claimed in claim 3, wherein said iodide containing compound is an iodide salt.

7. The kit as claimed in claim 6, wherein said iodide salt is selected from a group comprising:

potassium iodide, sodium iodide or mixture thereof.

8. The kit as claimed in claim 3, wherein said iodide indicator is applied in a form of solid.

9. The kit as claimed in claim 3, wherein said iodide indicator is applied in a form of solution and wherein said solution having a concentration level.

10. The kit as claimed in claim 3, wherein said indicators are at least in one container.

11. The kit as claimed in claim 1, wherein the polyvinyl alcohol indicator is applied in a form of solution and wherein concentration of said solution is 1 wt.-% through 10 wt.-%.

12. The kit as claimed in claim 11, wherein said concentration of said solution is 2 wt.-% through 7.5 wt.-%.

13. The kit as claimed in claim 9, wherein said concentration level is 0.01 M through 10 M.

14. The kit as claimed in claim 13, wherein said concentration level is 0.1 M through 5 M.

15. The kit as claimed in claim 2, wherein at least one preservative compound is used for preventing micro-organic growth in at least one of said indicators and wherein said preservative compound doesn'"'"'t interfere with determining residual chlorine or chloramine in said sample.

16. The kit as claimed in claim 15, wherein said preservative compound is sodium azide in the range of 1 mM to 3 mM.

17. The kit as claimed in claim 1, wherein said residual chlorine amount of said sample is 0.05 mg/L through 20 mg/L.

18. The kit as claimed in claim 1, wherein said kit comprises:

(a) Means for containing an iodide indicator solution for preparation of a first indicator, comprising an iodide compound and a buffer at a pH of 4 to 5, is stored, wherein concentration of iodide in said iodide indicator is in the range of 0.1 M to 10 M;

(b) Means for containing a polyvinyl alcohol indicator solution for preparation of a second indicator, comprising polyvinyl alcohol and a buffer at a pH of 2 to 6, is stored, wherein concentration of polyvinyl alcohol in said polyvinyl alcohol indicator is in the range of 1 wt.-% to 10 wt.-%;

(c) Means for mixing said first and said second indicator with said sample a pH of 2 to 6, wherein said mixing forming a dye and intensity of said dye being changed depending upon an amount of said residual chlorine or chloramine in said sample;

(d) Means for a colorimetric analysis having plural different sample color intensities wherein each of said different sample color intensities represents a different residual chlorine or chloramine amount so that said residual chlorine or chloramine amount of said sample is determined by comparing an intensity of said dye with said plural different sample color intensities.

19. The kit as claimed in claim 1, wherein said kit comprises a means for manually determining residual chlorine or chloramine amount of said sample.

20. The kit as claimed in claim 1, wherein said kit comprises a means for semi-automatically determining residual chlorine or chloramine amount of said sample.

21. The kit as claimed in claim 1, wherein said kit comprises a means for automatically determining residual chlorine or chloramine amount of said sample.

22. A method for determining residual chlorine or chloramines amount of a sample, comprising step of:

applying an effective amount of polyvinyl alcohol as an indicator.

23. The method as claimed in claim 22, wherein said method comprises steps of:

(a) Applying a source of a reducing agent for preparation of an indicator;

(b) Applying a source of polyvinyl alcohol in form of solution for preparation of another indicator;

(c) Mixing two above indicators with said sample;

wherein said mixing oxidize said reducing agent by said residual chlorine or chloramines, forming an oxidized compound, and forming a dye by reaction of polyvinyl alcohol with said oxidized compound;

wherein an intensity of said formed dye is changed depending upon the residual chlorine or chloramine amount of said sample;

(d) Determining said residual chlorine or chloramine amount from said intensity of said formed dye.

24. The method as claimed in claim 22, wherein at least one part of said method is performed automatically.

25. The method as claimed in claim 22, wherein at least one part of said method is performed manually.