Sampling and storage equipment

CAUTION! Large systematic errors may arise during
sampling and sample storage. Two major causes:

1. analyte loss from sample:		analyte
	true analyte concentration C_{i, true}	>	analyte concentration in the sample C_{i, sample}

2. contamination of sample		analyte
	true analyte concentration C_{i, true}	<	analyte concentration in the sample C_{i, sample}