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Química Nova

Print version ISSN 0100-4042

Abstract

RODRIGUES, Renato de Aragão Ribeiro; MELLO, William Zamboni de  and  SOUZA, Patricia Alexandre de. Atmospheric deposition of ammonium, nitrate ans sulfate on the montane dense ombrophilous forest in Serra dos Órgãos, RJ. Quím. Nova [online]. 2007, vol.30, n.8, pp. 1842-1848. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422007000800009.

Wet and dry (dust) deposition was measured in the Serra dos Órgãos National Park. VWM pH was 5.3. Non-sea-salt (nss) SO42- comprised 97% of total SO42-. The molar ratio [2(nss-SO42-) + NO3-]/[NH4+ + H+] was 1.1, suggesting that pH is predominantly controlled by H2SO4, HNO3, and NH3. Wet deposition of NH4+, NO3-, and nss-SO42- 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).

Keywords : rainwater chemistry; wet deposition; dry deposition.

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