ABSTRACT
There are many factors that influence the ability to get the correct result with any trace element technique, particularly in high-throughput cannabis testing laboratories. Unfortunately with plasma spectrochemistry techniques, the problem is magnified even more because of their extremely high sensitivity. This chapter suggests ways to minimize sources of errors in the test data. The methodology to reduce laboratory error and reduce contamination is composed of the three primary steps: First, understanding data validity criteria, the application of appropriate statistics, and the understanding of the use and terminology of analytical processes. The second step is correct selection and use of standards appropriate for the type and range of analysis being performed. The third step is the understanding of sample preparation and sources of contamination which can cause error to be introduced into analyses. The most common sources of standard and sample contamination, in addition to volumetric labware are water, reagents and acids, laboratory environment, storage, and personnel.
