Figure 5From: Application of principal component analysis in the pollution assessment with heavy metals of vegetable food chain in the old mining areasBiplot of PC1 and PC2 for vegetables data grouped on vegetables species, used PCA3-plant model. (Fe, Mn, Zn, Cu, Ni, Cd and Pb are variables used in PCA3-plant model that symbolized total contents of metals in vegetable samples, reported to fresh matter; R, M and Ref symbolized vegetables samples from contaminated respectively reference areas and numbers 1 to 9 attached to previous symbols refer to vegetables species or edible part: 1 for parsley roots, 2 for carrot roots, 3 for onion bulbs, 4 for parsley leaf, 5 for carrot leaf, 6 for cabbage, 7 for lettuce, 8 for cucumber and 9 for green bean).Back to article page