Chromotropic acid: Difference between revisions
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== Description == | == Description == | ||
White crystalline material used as an analytical reagent for the detection of aldehydes. A solution of chromotropic acid dissolved in concentrated [ | White crystalline material used as an analytical reagent for the detection of aldehydes. A solution of chromotropic acid dissolved in concentrated [[sulfuric acid]] will turn purple in the presence of aldehydes. A test using chromotropic acid in a closed enviornment to detect the offgassing of volatile aldehydes was recommended in 1994 by Zhang, Thickett, and Greene. | ||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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chromotropic acid test; 4,5-dihydroxy-2,7-napthalenedisulfonic acid; 1,8-dihydroxynaphthalene-3,6-disulfonic acid | chromotropic acid test; 4,5-dihydroxy-2,7-napthalenedisulfonic acid; 1,8-dihydroxynaphthalene-3,6-disulfonic acid | ||
== | ==Risks== | ||
* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC405262500&productDescription=CHROMOTROPIC+ACID+SODIUM+250GR&vendorId=VN00032119&countryCode=US&language=en SDS] | |||
==Physical and Chemical Properties== | |||
The fluorescence of chromotropic acid changes with pH (colorless below 3.5, and fluorescent blue above 4.5). | * Soluble in water. | ||
* The fluorescence of chromotropic acid changes with pH (colorless below 3.5, and fluorescent blue above 4.5). | |||
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== | ==Resources and Citations== | ||
* J.Zhang, D.Thickett, L.Greene, "Two Tests for the Detection of Volatile Organic Acids and Formaldehyde" ''JAIC'' 33(1), 1994, p. 47-53. | |||
J.Zhang, D.Thickett, L.Greene, "Two Tests for the Detection of Volatile Organic Acids and Formaldehyde" ''JAIC'' 33(1), 1994, p. 47-53. | |||
* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2298 | * ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2298 | ||
Latest revision as of 16:41, 29 May 2022
Description
White crystalline material used as an analytical reagent for the detection of aldehydes. A solution of chromotropic acid dissolved in concentrated sulfuric acid will turn purple in the presence of aldehydes. A test using chromotropic acid in a closed enviornment to detect the offgassing of volatile aldehydes was recommended in 1994 by Zhang, Thickett, and Greene.
Synonyms and Related Terms
chromotropic acid test; 4,5-dihydroxy-2,7-napthalenedisulfonic acid; 1,8-dihydroxynaphthalene-3,6-disulfonic acid
Risks
- ThermoFisher: SDS
Physical and Chemical Properties
- Soluble in water.
- The fluorescence of chromotropic acid changes with pH (colorless below 3.5, and fluorescent blue above 4.5).
| Composition | C10H8O8S2 |
|---|---|
| CAS | 129-96-4 (Anhydrous) |
| Molecular Weight | mol. wt. = 320.29 |
Resources and Citations
- J.Zhang, D.Thickett, L.Greene, "Two Tests for the Detection of Volatile Organic Acids and Formaldehyde" JAIC 33(1), 1994, p. 47-53.
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2298
- CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: The fluorescence of chromotropic acid changes with pH. It is colorless below pH=3.5 and above 4.5, it fluoresces blue.