Measurements of Reduced Sulphur Compounds in an Industrialized Tropical Region—Cubatão (BRAZIL)

Abstract

Abstract Ambient concentrations of SO2, H2S, COS and CS2 have been determined at various sites in the highly industrialized area of Cubatao (Brazil) and in adjacent ecosystems during the years 1990 to 1993. Sulphate has been analyzed in rain samples collected at three sites in the Serra do Mar. The sites are called Vale do Mogi (heavily polluted), Paranapiacaba (moderately polluted), and Vale do Pil[otilde]es (less polluted). Gas exchange of reduced sulphur compounds between biosphere and atmosphere has been examined with the aid of ambient air enclosures. The investigated sulphur sources (and sinks) were the estuaries south of Cubatao, a reservoir north of Cubatao, and vegetated soils at Vale do Mogi, Paranapiacaba, and Vale do Pil[otilde]es. The content of reduced sulphur compounds was determined in surface water samples from lakes, rivers, and estuaries in the area under investigation. Wet sulphate deposition and ambient SO2 concentrations revealed a similar hierarchy of Vale do Mogi, Paranapiacaba, an...