851713.fig.001a
(a)
851713.fig.001b
(b)
Figure 1: Examples of linear regression for a selected group of elements measured in MT matrix: (a) elements with noncompatible with zero ordinate in the origin at 99% CL and (b) elements with compatible with zero ordinate in origin at 99% CL. See text for explanation. Analyte concentrations are reported as a mean value and standard deviation from the three analytical replicates.