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Aporte atmosférico de amônio, nitrato e sulfato em área de floresta ombrófila densa montana na Serra dos Órgãos, RJ

2007; Brazilian Chemical Society; Volume: 30; Issue: 8 Linguagem: Inglês

10.1590/s0100-40422007000800009

ISSN

1678-7064

Autores

Renato de Aragão Ribeiro Rodrigues, William Zamboni de Mello, Patricia Alexandre de Souza,

Tópico(s)

Heavy metals in environment

Resumo

SERRA DOS ÓRGÃOS, RJ.Wet and dry (dust) deposition was measured in the Serra dos Órgãos National Park.VWM pH was 5.3.Non-sea-salt (nss) SO 4 2-comprised 97% of total SO 4 2-.The molar ratio [2(nss-SO 4 2-) + NO 3 -]/[NH 4 + + H + ] was 1.1, suggesting that pH is predominantly controlled by H 2 SO 4 , HNO 3 , and NH 3 .Wet deposition of NH 4 + , NO 3-, and nss-SO 4 2-was respectively 0.59, 0.25, and 0.30 kmol ha -1 yr -1 .Assuming that dry deposition of N can comprise 30-50% of its total (dry + wet) deposition, the latter is estimated to be 1.2-1.7 kmol ha -1 yr -1 (17-24 kg N ha -1 yr -1 ).

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