Comment glander au bureau en passant pour un pro et autres by Alexandre Civico, Guy Solenn

By Alexandre Civico, Guy Solenn

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Seems to be fixed as organic complexes. Cu, Zn and Pb remain partially as insoluble compounds. KEYWORDS Environmental pollution; heavy metals pollution; soil pollution; heavy metals in soils; multiple linear regression; soil retention mechanisms. INTRODUCTION Much work has been done everywhere in the past few years to study metals concentration in soils thought to be polluted by industrial activity or amended by application of sewage sludges. Some authors have studied the distribution of heavy metals according to physical and chemical properties of soils (Andersson, 1977; Bradley, Rudeforth and Wilkins, 1978; Garcia-Miragaya, 1978; Korte and others, 1976; Walsh, Sumner and Corey, 1978), have determined the availability for plants after several soil treatments (Mitchell, Bingham and Page, 1978; Quin and Syers, 1978; Zimdahl and Foster, 1976) and have even suggested tolerable limits from the point of view of the toxic effects on plants (Cottenie, 1977; Linz on and others, 1976).

RESULTS Table 1 exposes briefly soil analytical results. 09 5. I3 2 7 . 36 2 1 . 80 7. 34 230 51 2 205 33 3 . 37 2 . 4 5 72 29 18 1 . 7 < 0 . 8 1 . 76 76 . 9 1. 4 I505 19 O . 0 350 77 0 . Ο27 645 7 33 16 126 24 0 . 063 4Si . 1 9^ K 8 PH + Ranges correspond to each point, mean values and standard deviations to all samples . 54 F. Romero and C. Elejalde both properties of soil and metal contents. Predominant s o i l s , formed on limestone, are moderately alkaline (pH 7»05-7»35)» w i t h low organic carbon (2-*+), C 0 2 (2-4) and clay+silt (4-10) percentages and moderate cationic-exchange capacities (10-25 meq/lOO g ) .

Themselves and soil parameters. 75) corresponding to Pb-Cu-Zn, but none between metal amounts and soil properties. T A B L E 2 Matrices of Correlation Coefficients b e - tween Metal Contents and Soil Characteristics. 01 C+S CEC pH org Table 3 shows some of mathematical expressions obtained by multiple linear regression. First of all there are relationships between soil parameters, secondly between metal contents and finally equations for each m e t a l content and some of the f o l lowing soil factors i) Fe content, ii) depth level, iii) 0/oC02 and iv) cationic-exchange capacity.

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