# US 4,396,718 A · Field test method for estimation of concentration of organic materials in water

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- Number: US 4,396,718 A
- Document ID: US4396718A
- Status: Granted
- Kind: A
- Application number: 06/204,684
- Filed: 1980-10-28
- Granted: 1983-08-02
- Earliest claimed: 1979-09-04
- Assignees: The Sherwin-Williams Company
- Inventors: Clare B. Proudfoot
- Web page: https://patentgrep.com/patent/US4396718A

## CPC

- G01N 30/96: using ion-exchange (G01N30/02, G01N30/90 take precedence)
- B01J 39/04: Processes using organic exchangers
- C02F 1/285: {using synthetic organic sorbents}
- Y10T 436/10: Composition for standardization, calibration, simulation, stabilization, preparation or preservation; processes of use in preparation for chemical testing
- Y10T 436/147777: Plural nitrogen in the same ring [e.g., barbituates, creatinine, etc.]
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention relates to use of adsorption resins and ion exchange resins to separate selected organic materials and quantify their concentration in an aqueous solution based upon comparison to a visual standard. This process can be carried out in a relatively short time period and does not require special electronic equipment. Therefore, it can be conveniently used as a field test method to determine concentration of organic materials in aqueous solutions. This invention is especially useful in quantifying the concentration of triazoles in industrial cooling water.

## Claims

### Claim 1

A visual standard useful in the quantitative identification of concentrations of triazoles in aqueous solutions by visual determination, said standard comprising a series of colored metal ion triazole complexes, each element in the series having a concentration incrementally varied from the others, wherein each element of the series is prepared by a process which comprises:
(a) passing an aqueous solution having a known concentration of triazole through an ion exchange resin, wherein said ion exchange resin is in metal ion form and wherein said metal ions are reactive towards said triazole; and
(b) eluting excess metal ions from said ion exchange resin by addition of an effective amount of an aqueous inorganic salt to expose the adsorbed metal ion triazole colored product.

### Claim 2

A test kit useful for the quantitative identification of concentrations of triazoles in aqueous solutions said test kit comprising:
1. a plurality of columns containing a non-ionic macroreticular resin; and
2. a plurality of columns containing an acidic cationic ion exchange resin in metal ion form; and
3. containers containing solvents capable of eluting triazole which is adsorbed onto the macroreticular resin; and
4. a container containing an aqueous inorganic salt solution capable of washing excess metal ion from the acidic cationic ion exchange resin; and
5. a visual standard useful in the quantitative determination of concentrations of triazoles by visual comparison, said standard comprising a series of colored metal ion triazole complexes, each element in the series having a concentration incrementally varied from the others, wherein each element of the series is prepared by a process which comprises:
(a) passing an aqueous solution having a known concentration or triazole through an ion exchange resin, wherein said ion exchange resin is in metal ion form and wherein said metal ions are reactive towards said triazole; and
(b) eluting excess metal ions from said ion exchange resin by addition of an effective amount of an aqueous inorganic salt to expose the adsorbed metal ion triazole colored product.