... reasons, including establishing anaverage analyte value across a material, establishing an analyte concentration profileacross a material, or determining local contamination in a material. In ... element of self-training takes place,particularly amongst more experienced analysts. 10.4 The laboratory shall maintain an up-to-date record of the training that each member ofstaff has received. ... the sample packaging and whereappropriate, be resistant to fading, autoclaving, sample or reagent spillage, and reasonablechanges in temperature and humidity. 11.16 Some samples, those involved...