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BEN SEGHIER TAIBA.PDF.pdf - DSpace - Université de Tlemcen

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Eléments Moyen a Valeur a Moyen b b superficielle<br />

valeur<br />

(moyen) c<br />

(moyen) c<br />

Co 9.1 ‹ 3-70 8 0.05-65 20 14<br />

a : From U.S. Geological Survey Profesional Paper 1270 (1984), with permission. Represent<br />

analye from soils and other surficial materials from throughout the continental United States<br />

(regoliths including <strong>de</strong>ert containing little or no organic matter).<br />

b : From Bowen (1979)( Bowen, H.J.M. (1979). « Environemental Chemistry of the<br />

Elements » Aca<strong>de</strong>mic Press, London.) and references therein, with permision. Represents soil<br />

analyses from throughout the world.<br />

c : From Bernard (1979) ( Bowen, A.M. (1979). « Effect of heavy metals in the environment<br />

on human health » .In Contaminated soils-3 rd International Conference on the biochemistry of<br />

trace elements. Paris. France: INRA p21-34.<br />

Tableau 26 : Teneurs normales en métaux lourds dans les plantes en mg.kgˉ 1 <strong>de</strong><br />

matière sèche) [98]<br />

Eléments Cu Pb Zn Ni Co<br />

Valeurs<br />

normales<br />

10 1 50 1.5 0.2<br />

Tableau 27 : Teneurs critiques en métaux lourds (mg/kg <strong>de</strong> matière sèche) dans les plantes<br />

[99].<br />

ETM déficience<br />

Cu 3-5<br />

Pb -<br />

Zn 15-20<br />

Ni 1-5<br />

Co 0,2<br />

Toxicité<br />

20-100<br />

12-300<br />

100-400<br />

10-100<br />

15-50<br />

Ainsi, en comparant nos valeurs trouvées avec celles <strong>de</strong> références, on peut dire que :

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