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- Title
MICRODETERMINATION OF SPECIFIC GRAVITY IN FORENSIC CHEMISTRY.
- Authors
Kirk, Paul L.; Russel, Robert
- Abstract
The article discusses a method for determination of specific gravity of relatively large amounts of solid material. Micro methods have been described by numerous investigators for the determination of density of small amounts of solids. The method consists essentially in balancing the specific gravity of a liquid mixture to that of the glass or other fragment and determining, by means of a small pycnometer, the density of the equilibrium mixture of liquids. The glass or other solid fragment is placed in a micro tube having a capacity of about 1 ml. to which were added a few drops of heavy liquid such as methylene iodide. A fragment heavier than the heaviest available liquid would not be determinable by this procedure, but very few glasses have densities greater than that of methylene iodide. Heavier liquids with densities as high as 5.2 are available, but must be used with appropriate diluting liquids. Since these expedients are rarely necessary, the reference quoted may be consulted for details. To the heavy liquid on which the glass is floating is gradually added a little of the lighter liquid with stirring and with careful observation after each addition.
- Subjects
SPECIFIC gravity; SOLIDS; GLASS; POLYWATER; IODIDES; PYCNOMETERS; LIQUIDS
- Publication
Journal of Criminal Law & Criminology (08852731), 1941, Vol 32, Issue 1, p118
- ISSN
0885-2731
- Publication type
Article
- DOI
10.2307/1136706