Document Detail


Uncertainty of measurement for summed masses: application to controlled substances.
MedLine Citation:
PMID:  21094384     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Because sentences for drug possession depend on the mass of the seized drug, testing laboratories must often determine the summed mass of numerous items submitted under a single case. One common practice for this purpose is to continue analyzing and weighing samples until a legal threshold is passed, at which point it is important to inform the court whether the summed mass is significantly above the threshold, or only marginally so. This paper develops a means for estimating the uncertainty of the summed mass for the common situation where the readability, d, of the balance dominates the uncertainty. It is seen that for all sample sizes the uncertainty, UM, is given by the remarkable simple expression UM=(d/2)×[N+SQRT(3N)]+N×CCE, where N is the number of items and CCE is the absolute value of the calibration check error. In most instances, this can be further simplified to UM=N×d.
Authors:
Jack Wallace
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Publication Detail:
Type:  Journal Article     Date:  2010-10-15
Journal Detail:
Title:  Analytica chimica acta     Volume:  683     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  78-83     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Affiliation:
Ventura County Sheriff's Forensic Services Bureau, 800 S. Victoria Ave., Ventura, CA 93009, United States. jack.wallace@ventura.org
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