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Abstract:
Natural waters of the Amazonian Tertiary formations along the Manaus-Itacoatjara
Road were studied with respect to variations in average seasonal and yearly soluble silica
content. In general the variations are small and concentrations very low, for all input
fractions, i. e., rainfall, stemflow, and throughfall [about 90 percent of the total (470
analyses) lower than 1.0 mg/l]. While 90 percent of total ground water analyses (excluding well IV 3) have soluble silica concentrations lower than 1.5 mg/l, high rain forest stream waters are slightly higher (90 percent of all values lower than 2.0 mg/l). The Rio Negro waters show 90 percent of the total samples analyzed between 2.0 mg/l and 3.0 mg/l soluble silica.
