Air quality in post-mining towns: tracking potentially toxic elements using tree leaves.

Four eigenvalues of roots were extracted from the computation, and the first two discriminant roots were highly significant (Bartlett’s test of eigenvalues p << 0.01) and accounted for practically all (99.1%) of the original variance of data.

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Overall, a decreasing trend with the ageing of the leaves was recognized for C, Cu and Mg (Fig. 2 ), but no significant differences were found among any of the investigated macronutrients with respect to the leaf age groups.

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