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

Química Nova

Renato De Aragão Ribeiro Rodrigues¹  William Zamboni De Mello¹  Patricia Alexandre De Souza¹ 

[1] ,Universidade Federal Fluminense Instituto de Química Departamento de GeoquímicaNiterói RJ ,Brasil

关键词: rainwater chemistry;    wet deposition;    dry deposition;   

DOI  :  10.1590/S0100-40422007000800009

来源: SciELO

【 摘 要 】

Wet and dry (dust) deposition was measured in the Serra dos Órgãos National Park. VWM pH was 5.3. Non-sea-salt (nss) SO4(2-) comprised 97% of total SO4(2-). The molar ratio [2(nss-SO4(2-)) + NO3-]/[NH4+ + H+] was 1.1, suggesting that pH is predominantly controlled by H2SO4, HNO3, and NH3. Wet deposition of NH4+, NO3-, and nss-SO4(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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