Arsenic levels were determined in seventy three samples of well water, and in fifty samples of soil, forage and cow's milk collected at the most important dairy farms of the Comarca Lagunera located in Coahuila and Durango, Mexico, region naturally rich in As.
The total inorganic arsenic concentration in well water ranged from 7 to 740 mug L-1 and about ninety percent of the total arsenic was found as As (V).
The agricultural soil texture of the sampled area was sandy clay loam type with total arsenic levels up to 30 mug g-1, however, the extractable arsenic was not higher than 12% of the total and it was higher in the 0-30 cm depth horizon.
In alfalfa, the most important crop, the total aresenic ranged from 0.24 to 3.16 mug g-1, with 40% of it accumulated at the root level.
Significant correlations (p=0.05) were obtained between arsenic (III), (V) and total inorganic arsenic in groundwater with arsenic in soil (0-30 cm depth), and with arsenic in alfalfa (leaves and roots).
It was also found a good correlation between extractable arsenic in soil with As concentrations in alfalfa (roots).
Arsenic concentrations found in milk ranged from<0.9 to 27.4 ng g-1.
The cow's milk biotransfer factor for arsenic was up to 6 x 10-4, applying a pharmacokinetic approach.
It was associated with the exposure not only to food but also to water arsenic.
Mots-clés Pascal : Mexique, Amérique Centrale, Amérique, Arsenic V, Arsenic III, Pollution eau, Eau souterraine, Eau potable, Pollution sol, Sol cultivé, Devenir polluant, Accumulation biologique, Medicago sativa, Leguminosae, Dicotyledones, Angiospermae, Spermatophyta, Plante fourragère, Zea mays, Gramineae, Monocotyledones, Plante céréalière, Lait vache, Chaîne alimentaire
Mots-clés Pascal anglais : Mexico, Central America, America, Arsenic V, Arsenic III, Water pollution, Ground water, Drinking water, Soil pollution, Cultivated soil, Pollutant behavior, Biological accumulation, Medicago sativa, Leguminosae, Dicotyledones, Angiospermae, Spermatophyta, Fodder crop, Zea mays, Gramineae, Monocotyledones, Cereal crop, Cow milk, Trophic chain
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0332503
Code Inist : 001D16E. Création : 16/11/1999.