Difference between revisions of "Chromotropic acid"

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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 [http://cameo.mfa.org/materials/fullrecord.asp?name=sulfuric acid 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.
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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
  
== Other Properties ==
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==Risks==
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* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AC405262500&productDescription=CHROMOTROPIC+ACID+SODIUM+250GR&vendorId=VN00032119&countryCode=US&language=en SDS]
  
Soluble in water.
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==Physical and Chemical Properties==
  
The fluorescence of chromotropic acid changes with pH (colorless below 3.5, and fluorescent blue above 4.5).
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* Soluble in water.
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* The fluorescence of chromotropic acid changes with pH (colorless below 3.5, and fluorescent blue above 4.5).
  
 
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== Hazards and Safety ==
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==Resources and Citations==
  
Mallinckrodt Baker: [http://www.jtbaker.com/msds/englishhtml/c4455.htm MSDS]
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* J.Zhang, D.Thickett, L.Greene, "Two Tests for the Detection of Volatile Organic Acids and Formaldehyde" ''JAIC'' 33(1), 1994, p. 47-53.
 
 
== Additional Information ==
 
 
 
J.Zhang, D.Thickett, L.Greene, "Two Tests for the Detection of Volatile Organic Acids and Formaldehyde" ''JAIC'' 33(1), 1994, p. 47-53.
 
 
 
== Authority ==
 
  
 
* ''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 15:41, 29 May 2022

Chromotropic Acid Test

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.