18 documents found, page 1 of 2

Compartmented spatial correlation of drainage patterns with morphometric charac...

Made available in DSpace on 2022-04-28T19:50:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01; The knowledge of the physical aspects of the landscape at the hydrographic basin scale, such as relief, morphometry, and the interrelationships with the hydrological dynamics, make it possible to understand the drainage patterns and infer about the most environmentally vulnerable areas. Therefore, the s...

Plano de Desenvolvimento Institucional 2019-2028

Submitted by Luana Priscila Costa (luana@reitoria.unesp.br) on 2020-07-30T17:48:39Z No. of bitstreams: 2 PDI 2019-2028 08062020(1).pdf: 690435 bytes, checksum: 0e94368dd1f05e700bfb2eec51be3a24 (MD5) PDI 2019-2028 Documento de Apoio 08062020.pdf: 5477134 bytes, checksum: a35630a48f014f5b6e885a9589da6418 (MD5); Made available in DSpace on 2020-07-30T17:48:39Z (GMT). No. of bitstreams: 2 PDI 2019-2028 08062020(1)....

Substâncias húmicas: sistema de fracionamento sequencial por ultrafiltração com...

Aquatic humic substances: Molecular size fractionation and characterization of ...

The aquatic humic substances (AHS) investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/ Brazil by means of the collector XAD 8. A special five-stage tangential-flow ultrafiltration device was used for analytical fractionation of AHS. The fractionation patterns (6 fractions each) showed that metal traces remaining in AHS after their XAD 8 isolation have different size d...

Extraction of aquatic organic matter by temperature decreasing: An alternative ...

In this work was developed an alternative methodology to separation of aquatic organic matter (AOM) present in natural river waters. The process is based in temperature decreasing of the aqueous sample under controlled conditions that provoke the freezing of the sample and separation of the dark extract, not frozen and rich in organic matter. The results showed that speed of temperature decreasing exerts strong...

Substâncias húmicas aquáticas: fracionamento moleular e caracterização de rearr...

Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas ...

The aquatic humic substances investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. Molecular spectroscopy investigations of these humic substances using 1H-NMR and 13C-NMR indicated the presence of high aromaticity with few substituents, small amounts of carboxylic carbon, and an aliphatic/aromatic ratio of 1:1. The relatively high...

Extração de matéria orgânica aquática por abaixamento de temperatura: uma metod...

The influence of seasonalness on the structural characteristics of aquatic humi...

In this work, humic substances were extracted from water samples collected monthly from the Negro River basin in the Amazon state (Brazil) to study their properties in the Amazonian environment and interactions with the mercury ion considering the influence of seasonalness in this formation. The C/H, C/N and C/O atomic ratio parameters, functional groups, concentration of semiquinone-type free radicals, pH, plu...

Influência da sazonalidade nas características estruturais de substâncias húmic...