Figure 6From: 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 THQm data grouped on vegetables species, used PCA- THQ model. (Fe, Mn, Zn, Cu, Ni, Cd and Pb are variables in PCA-THQ model that symbolized THQm for each metals calculated for each vegetable species, compiled after Harmanescu et al., 2011 [61]; R, M and Ref symbolized vegetables samples from contaminated respectively reference areas and numbers 1 to 9 attached to previous symbols refers 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