Issue 3, 2000

Recent trends in inter-laboratory precision at ppb and sub-ppb concentrations in relation to fitness for purpose criteria in proficiency testing

Abstract

Recently conducted collaborative trials in which the analyte concentration was below 100 ppb provided reproducibility standard deviations that were systematically lower than the predictions of the Horwitz function. This study shows that such statistics are better represented by a model with a constant relative standard deviation. A modified function is suggested as suitable for use (with due caution) as a fitness-for-purpose criterion.

Article information

Article type
Communication
Submitted
12 Jan 2000
Accepted
31 Jan 2000
First published
22 Feb 2000

Analyst, 2000,125, 385-386

Recent trends in inter-laboratory precision at ppb and sub-ppb concentrations in relation to fitness for purpose criteria in proficiency testing

M. Thompson, Analyst, 2000, 125, 385 DOI: 10.1039/B000282H

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