Physics Institute, University of São Paulo, São Paulo-SP, Brazil.
Environ Int. 2010 Apr;36(3):243-6. doi: 10.1016/j.envint.2009.12.003. Epub 2010 Jan 6.
We investigated chronic incorporation of metals in individuals from poor families, living in a small, restrict and allegedly contaminated area in São Paulo city, the surroundings of the Guarapiranga dam, responsible for water supply to 25% of the city population. A total of 59 teeth from individuals 7 to 60 years old were collected. The average concentrations of Pb, Cd, Fe, Zn, Mn, Ni and Cr were determined with an Atomic Absorption Spectrophotometer. The concentrations of all metals as function of the individuals' age exhibited a remarkable similarity: peaks between 7 and 10 years and sharply decreasing at higher ages, which could be attributed to alimentary habits and persistence to metals exposure all along the individuals' life span. From all the measured metals, lead and cadmium were a matter of much more concern since their measured values are close to the upper limits of the world wide averages.
我们研究了生活在圣保罗市一个小而受限且据称受到污染的地区的贫困家庭个体中金属的慢性累积情况。该地区位于瓜拉皮兰加大坝周围，为该市 25%的人口提供用水。共收集了 59 颗年龄在 7 至 60 岁之间的牙齿。使用原子吸收分光光度计测定了 Pb、Cd、Fe、Zn、Mn、Ni 和 Cr 的平均浓度。所有金属的浓度随个体年龄的变化表现出明显的相似性：7 至 10 岁之间的峰值和年龄较高时急剧下降，这可能归因于个体整个生命周期中的饮食习惯和对金属暴露的持续存在。在所测量的所有金属中，铅和镉更为令人担忧，因为它们的测量值接近世界平均水平的上限。
