# US 4,395,494 A · Reagent and method for the determination of hydrazine

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- Number: US 4,395,494 A
- Document ID: US4395494A
- Status: Granted
- Kind: A
- Application number: 06/200,249
- Filed: 1980-10-24
- Granted: 1983-07-26
- Earliest claimed: 1979-10-24
- Assignees: Merck Patent GmbH
- Inventors: Detlef Bodart; Roland Bitsch
- Web page: https://patentgrep.com/patent/US4395494A

## CPC

- G01N 31/22: using chemical indicators (G01N31/02 takes precedence)
- G01N 33/1826: {Organic contamination in water}
- Y10T 436/173845: Amine and quaternary ammonium
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

4-dimethylaminocinnamaldehyde can be used as a reagent for determination of hydrazine in an aqueous solution. The reagent is especially stable and useful when dissolved in an ethylene glycol monoalkyl ether.

## Claims

### Claim 1

A reagent for use in the colorimetric determination of hydrazine in an aqueous solution comprising 4-dimethylaminocinnamaldehyde and an ethylene glycol mono-C.sub.1-14 -alkylether.

### Claim 2 (depends on 1)

A reagent of claim 1 comprising 2 to 4 wt.% of 4-dimethylaminocinnamaldehyde.

### Claim 3 (depends on 1)

A reagent of claim 1 wherein the ethylene glycol monoalkyl ether is ethylene glycol monoethyl ether.

### Claim 4 (depends on 1)

A reagent of claim 1 wherein the reagent consists essentially of a solution of the 4-dimethylaminocinnamaldehyde in the ethylene glycol mono-C.sub.1-4 -alkylether.

### Claim 5 (depends on 4)

A reagent as in claim 4 wherein the ethylene glycol monoalkyl ether is ethylene glycol monoethyl ether.

### Claim 6 (depends on 4)

A reagent as in claim 4 comprising 2 to 4 wt.% of 4-dimethylaminocinnamaldehyde.

### Claim 7 (depends on 2)

A reagent of claim 2 wherein the amount of 4-dimethylaminocinnamaldehyde is about 3 wt.%.

### Claim 8 (depends on 6)

A reagent of claim 6 wherein the amount of 4-dimethylaminocinnamaldehyde is about 3 wt.%.

### Claim 9 (depends on 2)

A reagent of claim 2 wherein the ethylene glycol monoalkyl ether is ethylene glycol monoethyl ether.