Difference between pages "Sodium azide test" and "Cuprotesmo"

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[[File:azide1.jpg|thumb|Iodide-Azide Test]]
 
 
== Description ==
 
== Description ==
  
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A microchemical test used to identify potentially hazardous [[sulfur|sulfur]] components in materials prior to their use near [[silver|silver]] objects. The sodium azide test detects the presence of reducible sulfur but not stable sulfur compounds such as sulfates. Reducible sulfur compounds can readily tarnish silver. For the test, 3 gm of sodium azide is dissolved in 100 ml of a 0.05 M [[iodine|iodine]] solution, then mixed with 3 ml [[denatured%20alcohol|methylated spirits]] and allowed to set for 30 minutes. A small portion of the test sample (2 mm fiber or 200 micron particles) is placed on a glass microscope slide under a coverslip. While observing the sample with a microscope (usually 40x), the reagent is introduced under the coverslip. Reducible sulfur produces visually apparent bubbles due to the formation of nitrogen during its reaction with the sodium azide/iodine solution. [[Wool|Wool]] fibers can be used as a reference for a positive test.
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[Macherey-Nagel, GmBH] A brand name for a colorimetric indicator paper used to detect copper. Cuprotesmo paper, when moistened with de-ionized water, will react with copper and copper containing compounds to form a pink-purple complex (Odegaard et al 2000).
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== Synonyms and Related Terms ==
 
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iodide azide test
 
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== Risks ==
 
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* Sodium azide is highly toxic. 
 
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* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=S227I1&productDescription=SODIUM+AZIDE+GRAN+PURIF+1+KG&vendorId=VN00033897&countryCode=US&language=en SDS]
 
  
 
==Resources and Citations==
 
==Resources and Citations==
  
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* V. Daniels, S Ward, "A Rapid Test for the Detection of Substance which will Tarnish Silver" ''Studies in Conservation'', 27(2), 1982, p.58-60.
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* N.Odegaard, S.Carroll, W.Zimmt, ''Material Characterization Tests for Objects of Art and Archaeology'', Archetype Publications, London, 2000
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* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
 
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* Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002
 
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* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 8724
 
  
  
  
 
[[Category:Materials database]]
 
[[Category:Materials database]]

Latest revision as of 15:39, 31 May 2022

Description

[Macherey-Nagel, GmBH] A brand name for a colorimetric indicator paper used to detect copper. Cuprotesmo paper, when moistened with de-ionized water, will react with copper and copper containing compounds to form a pink-purple complex (Odegaard et al 2000).

Resources and Citations

  • N.Odegaard, S.Carroll, W.Zimmt, Material Characterization Tests for Objects of Art and Archaeology, Archetype Publications, London, 2000

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