Deciphering the Chemistry of Condensed Aromatic "Black" Carbon and Nitrogen in Amazonian Anthrosols.

ABSTRACT: Amazonian anthrosols are renowned for their high fertility and dark color, properties primarily attributed to the abundance of condensed aromatic carbon (ConAC) in the soil organic matter. ConAC, commonly referred to as black carbon, play a key role in the stability and nutrient retention of these soils. However, the processes governing the formation of ConAC and its transformation into oxygenated derivatives remain poorly understood. In this study, we used multiple analytical platforms to investigate the chemistry of ConAC-rich humic acids (HA) extracted from Terra Mulata de Indio, a type of Amazonian anthrosol. The results reveal that ConAC are predominantly nonprotonated and consist of approximately 4-10 condensed rings. These structures exhibit varying degrees of oxygenation (1-

SUBMITTER: Dos Santos JV 

PROVIDER: S-EPMC12368991 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature