... SAMPLE HANDLING AND PREPARATION 11.1 Analytical tests may be required for a variety of reasons, including establishing an average analyte value across a material, establishing an analyte concentration ... This guide has been produced by a working group comprising David Holcombe, LGC, UK; Bernard King, NARL, Australia; Alan Squirrell, NATA, Australia and Maire Walsh, State Laboratory, Ireland In addition, ... GUIDE TO QUALITY IN ANALYTICAL CHEMISTRY CITAC/Eurachem Guide Guide to Quality in Analytical Chemistry An Aid to Accreditation This document has been produced by a joint Working Group of CITAC...