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mg per 100 g fresh tissue weight

Radish hypocotylsa

Cd 2.7(42); Zn 195(167); Cu 9.8(9.9)

Strawberry fruita

Cd 1.3(14); Zn 188(167); Cu 36(33)

Lettuce leafa

Cd 3.4(54); Zn 382(348); Cu 24(22)

Melon pulpa

Cd 0.55(3.50); Zn 97.6(87); Cu 14(11.6)

Melon leafa

Cd 15(220); Zn 510(470); Cu 64(57)

aSoil background TEs concentrations were (mg/kg): Cd 0.33; Zn 14.7; Cu 12.9 whereas in parenthesis are values obtained under Cd-contaminated soil conditions (mg/kg): ~10 (in trial with melon) and ~5 (in all other trials)

aSoil background TEs concentrations were (mg/kg): Cd 0.33; Zn 14.7; Cu 12.9 whereas in parenthesis are values obtained under Cd-contaminated soil conditions (mg/kg): ~10 (in trial with melon) and ~5 (in all other trials)

along the long-distance transport is deficient. Given alkaline conditions (pH ~8) and high concentration of LMW/HMW organic and inorganic (e.g. Cl-) ligands in the phloem, polyvalent metal cations are probably more complexed there than in the xylem (Ondrasek 2008 and references therein).

Although TEs concentration in edible crop tissues may be many times lower than in non-edible ones (Table 22.1), consumption of food/feed crops grown in soils containing high concentration of TEs represents one of the main routes of metals for humans/animals. Metal intake via food, drink and/or medicaments (e.g. Al intake in tea and medications; Rengel 2004) for the majority of human population is unavoidable, even though the amount of intake would depend on the selection of foodstuff (Table 22.1). According to ANZFA (1997), for the Australian and N. Zealand population, consumption of plant foodstuffs represent a dominant route (84%) for Cd intake, with more 47% of the total Cd taken in originating from potato (Table 22.1).

Many TEs have a long biological half-life (Cd > 10 and Pb ยป 20 years) and their accumulation in human body gradually increases with time, causing a number of health problems/diseases that are the main reasons for mandatory reductions of annual emissions of certain TEs in many countries (e.g. Lado et al. 2008).

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