Figure 1. Bland-Altman difference plot for trace element results by FAAS and ICP-OES. (A) Bland-Altman difference plot comparing mineral and trace
element concentrations obtained with FAAS against ICP-OES. (B-F) Bland-Altman difference plots comparing mineral and trace element concentrations
of Fe, Mn, Zn, Ca, and Mg, respectively. The solid line represents the mean difference in quantitative measurement of essential minerals and trace elements
between the methods, and the red dashed lines are mean ( 1.96 SD.