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Les dechets du traitement des phosphates au Togo renferment des metaux lourds a l’origine de la contamination des sols, l’air, l’eau, la faune et la flore. Ce qui constitue un danger pour la sante des populations exposees. La presente etude a pour but d’evaluer les taux sanguins des metaux lourds chez les sujets exposes. Ainsi, les teneurs en cadmium, plomb, cuivre et nickel du sang ont ete determinees au spectrophotometre d’absorption atomique chez 260 sujets dont 173 employes, 60 riverains de l’usine et 27 sujets temoins. Les resultats montrent que les valeurs moyennes des metaux lourds sont significativement plus elevees (p < 0,001) chez les travailleurs et les riverains de l’usine. La prevalence de la bioconcentration chez les sujets exposes varie en fonction du degre de contamination par les poussieres de phosphate. Elle serait liee soit a la consommation d’aliments contamines, soit a la duree de l’exposition aux metaux lourds. Ces resultats confirment une contamination importante et des risques sanitaires graves chez les sujets etudies. Ce qui devrait permettre la mise en place dans l’usine de programmes efficaces et des mesures adequates pour une meilleure protection des employes et une reduction sensible de la pollution des localites riveraines. © 2015 International Formulae Group. All rights reserved. Mots cles: Phosphates, metaux lourds, bioconcentration, Sud Togo English Abstract The waste from the processing of phosphates in Togo contains heavy metals causing the contamination of soil, air, water, flora and fauna. This constitutes a danger to the health of exposed populations. This study aimed at evaluating blood levels of heavy metals in exposed subjects. Thus, the blood levels of cadmium, lead, copper and nickel were determined using atomic absorption spectrophotometer in 260 subjects, including 173 employees, 60 residents around the factory and 27 control subjects. The results show that the average values of heavy metals were significantly higher (p < 0.001) among workers and residents around the factory. The variation of prevalence of bioconcentration in exposed subjects depends on the degree of contamination by phosphate dust. It would be linked to the consumption of contaminated food, or the duration of exposure to heavy metals. These results confirmed significant contamination and serious health risks in the studied subjects. This should allow the introduction, in the plant, of effective programs and appropriate measures for better protection of employees and a significant reduction in pollution of areas surrounding the factory. © 2015 International Formulae Group. All rights reserved. Keywords: Phosphates, heavy metals, bioconcentration, South Togo

Evaluation des teneurs des métaux lourds dans le sang des sujets de la zone de traitement des phosphates au Sud du Togo