Author(s): Queiroz, Maria Mireide Andrade
Date: 2015
Origin: Oasisbr
Subject(s): Rio Solim??es (AM) - Caracteriza????o f??sico-qu??mica; Rio Purus (AM) - Caracteriza????o f??sico-qu??mica; Rio Japur?? (AM) - Caracteriza????o f??sico-qu??mica; ??guas pretas e brancas - Amazonas; CI??NCIAS EXATAS E DA TERRA: GEOCI??NCIAS
Made available in DSpace on 2015-04-22T21:58:39Z (GMT). No. of bitstreams: 1 Maria Mireide Andrade Queiroz.pdf: 3150765 bytes, checksum: bfb130949fad42201449575b9628fccb (MD5) Previous issue date: 2006-05-07
CAPES - Coordena????o de Aperfei??oamento de Pessoal de N??vel Superior
The present study evaluated the physical-chemical aspects of 64 water samples from the Solim??es, Purus rivers and their tributaries and Japur?? river (29 from the surface, 27 from sediments in suspension and 8 of wells and springs), collected in November 2004 in the state of Amazonas between the cities of Manacapuru and Alvar??es as well as Anam?? and pirarauara. Chemical analyses of the higher elements, trace-elements, rare earth elements, Sr isotopes, were carried out in addition to mineralogical composition analyses on the sediments in suspension collected according to the rules in Standard Methods for Examination of Water and Wastewater. The studied waters were divided into two groups: black-water and white-water. The former, which includes the Solim??es and Purus rivers tributaries presents a higher SiO2, Fe, and Al concentration, whereas the latter portrays the highest concentration in Ca2+, Na+, K+, Mg2+, HCO3-, Mn, Ba, Sr, B, Ce and As. In general, the Solim??es river tributaries present higher chemical load than those of Purus river, and white waters more than black waters. The results obtained on the isotopic ratios 87Sr/86Sr showed higher ratios in the Solim??es rives white waters whereas its tributaries are less radiogenic than those of the Purus river. Kaolinite is the most abundant mineral in the sediments in suspension, with a higher rate in the Solim??es river tributaries tha in the other investigated ones. The suspended material in Ti, Zn, Ba and V, represents 98% of the total chemical composition, since Ge is negligible in all studied waters.
O presente estudo procurou avaliar os aspectos f??sico-qu??mico de 64 amostras (29 de ??guas superficiais, 27 de sedimentos em suspens??o e 8 de po??os e fontes), coletado em novembro de 2004 no Estado do Amazonas entre as cidades de Manacapuru-Alvar??es e Anam??-Pirarauara. Foram realizadas an??lises de elementos-tra??o, is??topos de estr??ncio, elementos terras raras, composi????o mineral??gica e an??lise de componentes principal (PCA) nas ??guas e sedimentos coletados de acordo com as normas contidas no Standard Methods for Examination of Water and Wastewater. As ??guas estudadas dividiram-se dois grupos. O primeiro constituindo as ??guas pretas e o segundo as brancas. No primeiro grupo as ??guas t??m menor concentra????o de materiais em suspens??o, pH, condutividade el??trica, turbidez, SiO2. No segundo, h?? maior concentra????o em Ca2+, Na+, K+, Mg2+, HCO3-, Al, Mn, Ba, Sr, B, Ce e As. Nos elementos-tra??o, o Fe e Al predominam em todas as drenagens investigadas, com maior concentra????o nas ??guas pretas. De modo geral, os afluentes do Solim??es t??m maior carga qu??mica que os do Purus. Os resultados obtidos nas raz??es isot??picas 87Sr/86Sr evidenciaram raz??es mais elevadas nas ??guas brancas do rio Solim??es que os demais rios, enquanto nos seus afluentes ocorreu o inverso. Os resultados obtidos a partir das an??lises mineral??gica conclui-se que a caulinita predomina em todas as drenagens investigadas, com maior propor????o nos afluentes do rio Solim??es e em menor nos do Purus e nos rios Solim??es, Purus, Japur?? e furo Parati Grande. O material em suspens??o apresentou grande varia????o na concentra????o dos elementos-tra??o, especialmente em Ti, Zn, Ba e V, que representam 98% do total da composi????o qu??mica desse material, j?? o Ge ?? inexpressivo em todas as ??guas estudadas.
