Keywords
drinking water
schools
atomic absorption spectrometry
GFAAS
How to Cite
Abstract
Drinking water is one of the possible sources of lead exposure in urban areas. Children are more susceptible when exposed to this metal. The purpose of the present study was to assess the concentration of lead in drinking water consumed in municipal schools of São Paulo. The concentrations of lead in samples collected immediately after opening the faucet were compared with those lead levels in water collected after two minutes in continuous flowing. Lead concentration was determined by graphite furnace atomic absorption spectrometry (GFAAS), with transversal heating and Zeeman background correction. Among twelve surveyed schools, the water samples from two schools contained lead levels above the limits determined by Brazilian legislation (0.01 mg.L-1). After two minutes of continuous flowing, lead concentrations in these locals were below 0.01 mg.L-1. Corrective actions in water distribution system of these schools were implemented, and after subsequent analysis, lead concentrations were below the quantification limit of the method (0.001 mg.L-1), indicating that these actions were appropriated in order to make the water suitable for human consumption.References
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