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Mercury Concentrations in Bulk Atmospheric Deposition over the Coast of Rio de Janeiro, Southeast, Brazil

2002; Brazilian Chemical Society; Volume: 13; Issue: 2 Linguagem: Inglês

10.1590/s0103-50532002000200006

1678-4790

Luiz Drude de Lacerda, Heloísa H. M. Paraquetti, Carlos Eduardo de Rezende, Luiz Fernando Ferraz da Silva, Emmanoel Vieira Silva-Filho, Rozane Valente Marins, Mario G. Ribeiro,

Water Quality and Pollution Assessment

Total Hg concentrations were measured in bulk atmospheric deposition from three sampling stations along the Rio de Janeiro State coast, Southeast, Brazil, from October 1998 to December 1999. Samples were collected at Campos dos Goytacazes, an agriculture center at the North coast; Niterói, an industrialized metropolitan area and at Itacuruçá, a tourist town at the South. Concentrations at Campos average 0.51 ng L-1, ranging from 0.07 to 1.01 ng L-1, and showed a seasonal trend, probably affected by burning of sugar cane plantations in winter. At Niterói, concentrations were highest, averaging 0.73 ng L-1 andranging from 0.06 to 2.95 ng L-1. No pattern of temporal variation was observed and concentration peaks are probably related to industrial emissions. At Itacuruçá, Hg concentrations were below the detection limit of the method (0.02 ng L-1) in 35% of the samples, with an average of 0.24 ng L-1 and ranging from <0.02 to 1.04 ng L-1.