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ERIC Number: EJ913321
Record Type: Journal
Publication Date: 2010-Mar
Pages: 4
Abstractor: As Provided
Reference Count: 11
ISSN: ISSN-0021-9584
A Laboratory Exercise to Demonstrate the Theory and Practice of Analytical Sampling
Logue, Brian A.; Youso, Stephanie L.
Journal of Chemical Education, v87 n3 p316-319 Mar 2010
In analytical chemistry classes, the importance of gathering a proper sample for analysis of bulk materials is often addressed only briefly or not at all. Although a number of classroom and laboratory exercises have been developed to illustrate factors that impact error introduced by sampling, they generally do not demonstrate the main goal of applying sampling theory for chemical analysis: determining the quantity of sample necessary to achieve a desired error. In this analytical laboratory exercise, students obtain representative samples by initial calculation of the quantity of bulk material to gather to achieve a predetermined sampling error. Students also evaluate some of the properties of a sample that contribute to sampling error. These concepts are introduced in the laboratory using simple surrogate samples and are then applied to a "realistic" scenario that also incorporates gravimetric analysis techniques. (Contains 1 figure and 3 tables.)
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A