ISSN: 0022-1198
CODEN: JFSCA
Published Online: 1 April 1979
Page Count: 5

A Liquid Gradient Density Screening System for Soil Sample Identification Studies Using a Minicomputer
Harbin, DN
Chemists, University of Missouri-Kansas City,

Covey, EL
Criminalists, Regional Criminalistics Laboratory, Mo.

Howell, GR
Criminalists, Regional Criminalistics Laboratory, Mo.

Lott, JW
Chemists, University of Missouri-Kansas City,

Lott, PF
Chemists, University of Missouri-Kansas City,

(Received 5 July 1978; accepted 28 September 1978)

Abstract

The use of density gradient systems for the identification and comparison of soil samples is a well-recognized procedure [1,2]. In the usual manual method, liquid from a series of mixtures consisting of various ratios of high and low density liquids, such as 1,1,2,2-tetrabromoethane and bromobenzene, is added to a glass tube positioned vertically in a stand having a ruled background. The liquid is added up to each line and two or more identical tubes are prepared for comparison of the unknown against the reference material. A simple 8- to 10-step gradient is usually sufficient to obtain a usable resolution for most soil samples.

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Paper ID: JFS10860J
DOI: 10.1520/JFS10860J
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