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

Latest revision as of 15:41, 31 May 2022

Description

White granular powder. Sodium benzoate is used as an antiseptic and preservative in paints, food, and medicine. It is also used as a rust and mildew inhibitor.

Synonyms and Related Terms

benzoate of soda; sodium benzoic acid; Antimol

Chemical structure

Risks

Combustible.
Ingestion of large quantities is toxic.
Maximum allowable concentration in food is 0.1%.
ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water, ethanol. Forms slightly alkaline solution in water.

Composition	C6H5COONa
CAS	532-32-1
Molecular Weight	mol. wt. = 144.1

Resources and Citations

Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979

Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942

The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 8725

G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p 777

The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976

@@ Line 1: / Line 1: @@
-[[File:azide1.jpg|thumb|Iodide-Azide Test]]
 == Description ==
-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.
+White granular powder.  Sodium benzoate is used as an antiseptic and preservative in paints, food, and medicine.  It is also used as a rust and mildew inhibitor.
 == Synonyms and Related Terms ==
-iodide azide test
+benzoate of soda; sodium benzoic acid; Antimol
+[[[SliderGallery rightalign|sodium benzoate.jpg~Chemical structure]]]
 == Risks ==
-* Sodium azide is highly toxic.
+* Combustible.
-* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=S227I1&productDescription=SODIUM+AZIDE+GRAN+PURIF+1+KG&vendorId=VN00033897&countryCode=US&language=en SDS]
+* Ingestion of large quantities is toxic.
+* Maximum allowable concentration in food is 0.1%.
+* ThermoFisher: [https://www.fishersci.com/store/msds?partNumber=AAA1594630&productDescription=SODIUM+BENZOATE+99%25+250G&vendorId=VN00024248&countryCode=US&language=en SDS]
+==Physical and Chemical Properties==
+Soluble in water, ethanol. Forms slightly alkaline solution in water.
+{| class="wikitable"
+|-
+! scope="row"| Composition
+| C6H5COONa
+|-
+! scope="row"| CAS
+| 532-32-1
+|-
+! scope="row"| Molecular Weight
+| mol. wt. = 144.1
+|}
 ==Resources and Citations==
-* N.Odegaard, S.Carroll, W.Zimmt, ''Material Characterization Tests for Objects of Art and Archaeology'', Archetype Publications, London, 2000.
+* Michael McCann, ''Artist Beware'', Watson-Guptill Publications, New York City, 1979
+* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942
-* 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.
+* ''The Merck Index'', Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996  Comment: entry 8725
-* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
+* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971  Comment: p 777
-* Pam Hatchfield, ''Pollutants in the Museum Environment'', Archetype Press, London, 2002
+* ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998
-* ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 8724
+* ''Van Nostrand's Scientific Encyclopedia'', Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
 [[Category:Materials database]]