Abstract: This study proposes assessing the quality and completeness of references included in scientific articles by applying a rule-based system supported by the use of regular expressions. Referencing resources used is sometimes seen as a secondary task or a simple requirement in the publication process, ignoring the impact and importance of proper writing, author’s credits, communications, bibliometric indicators, and collaborations. A rule-based system is created with the ability to extract citations from articles published by journals, which allows to evaluate references to scientific articles, books, and book chapters in APA and IEEE styles. It is concluded that the system contributes to improving the quality of the editorial process by allowing editors to check the current citation status of their journals while assisting in their decision-making process by ensuring proper citations.

Resumen: Este trabajo plantea la evaluación de calidad y completitud de las referencias incluidas en artículos científicos, utilizando un sistema basado en reglas y apoyado en el uso de expresiones regulares. Referenciar los recursos utilizados en un trabajo, en ocasiones es visto como una tarea secundaria o un simple requisito en el proceso de publicación; pasando por alto el impacto y la importancia que tiene su correcta redacción, en cuanto a crédito a autores, comunicación, indicadores bibliométricos y colaboración. Se crea un prototipo con la capacidad de extraer las citas de los trabajos publicados por la revista y evaluar las referencias a artículos científicos, libros y capítulos de libro en los estilos APA e IEEE. Se concluye que el sistema contribuye a mejorar la calidad del proceso editorial, al permitir que los editores conozcan el estado actual de citación de sus revistas, coadyuvando en la toma de decisiones para garantizar la adecuada referenciación de los trabajos.

The chemical and spectroscopic characteristics of soil organic matter (SOM) isolated from Amazonian dark earth (ADE) and surrounding soil (SR) were evaluated according to the soil depth. The results showed opposite trends for the soils. While ADE featured SOM with a greater aromatic condensation degree and greater hydrophobicity in the top layer, the SR showed more aliphatic and polar SOM. The SOM arrangement from ADE was less hydrophobic, aromatic, and more polar in depth. In contrast, the SOM from SR showed an increase in molecular weight and hydrophobicity. Besides the aromatic protection in the SOM from ADE, there was organo-mineral protection through binding to soil minerals. This suggested that the SOM from ADE was protected by its hydrophobicity and interaction with minerals compared with that from the SR, thereby showing that the combination of both characteristics is important to create new technologies for soil carbon storage.

Este estudo teve como principal objetivo avaliar o efeito da radiação solar sobre a capacidade de complexação das substâncias húmicas aquáticas (AHS) com as espécies metálicas Al3+, Cr3+, CrO4(2-) e Ni2+. Microcosmos foram montados com AHS extraídas do Rio Preto com concentração de 5,0 mg L-1 de carbono orgânico dissolvido e diferentes concentrações de metais, sendo expostos à radiação solarin situ. As constantes de estabilidade condicional foram de 2,0 × 10-2, 1,1 × 10-5 e 2,6 × 10-2 para os complexos AHS-Cr3+, AHS-Ni2+ e AHS-CrO4(2-), respectivamente. Os resultados mostraram que a radiação solar foi responsável por um decréscimo na capacidade de complexação de 15-26% para AHS-Al3+, 15-72% para AHS-Cr3+, 12-18% para AHS-CrO4(2-) e de 13-42% para AHS-Ni2+. Conclui-se que a radiação solar altera a disponibilidade de metais previamente complexados às AHS, tornando-os disponíveis no corpo aquático.

This study had as main objective to assess the effect of solar radiation on the capacity of the aquatic humic substances (AHS) to complex Al3+, Cr3+, CrO4(2-) and Ni2+. Microcosms were prepared with AHS from Preto River containing 5.0 mg L-1 of dissolved organic carbon and different concentrations of metal species, being exposed to solar radiation, in situ. Conditional stability constants obtained for the AHS-Cr3+, AHS-Ni2+ and AHS-CrO4(2-) complexes were 2.0 × 10-2, 1.1 × 10-5 and 2.6 × 10-2, respectively. The results showed that solar radiation is responsible for decreasing capacity complexation in 15-26% for AHS-Al3+, 15-72% for AHS-Cr3+, 12-18% for AHS-CrO4(2-) and 13-42% for AHS-Ni2+. We can conclude that solar radiation alters metals' availability previously complexed to AHS, making them available in the aquatic body.

This work aims to study spatial and seasonal variability of some chemical-physical parameters in the Turvo/Grande watershed, São Paulo State, Brazil. Water samples were taken monthly, 2007/07-2008/11, from fourteen sampling stations sited along the Turvo, Preto and Grande Rivers and its main tributaries. The Principal Component Analysis and hierarchical cluster analysis showed two distinct groups in this watershed, the first one associated for the places more impacted by domestic effluent (lower levels of dissolved oxygen in the studied region). The sampling places located to downstream (Turvo and Grande rivers) were discriminate by diffuse source of pollutants from flooding and agriculture runoffs in a second group.