Geochimica Brasiliensis最新文献_第3页

Avaliação de qualidade das águas superficiais no lago da barragem de Três Marias-MG tres Marias-MG大坝湖面水质评价

Geochimica Brasiliensis Pub Date : 2020-02-23 DOI: 10.21715/gb2358-2812.2019334341

Ciro Couto Bento, G. Lima, H. Baggio, A. Horn

{"title":"Avaliação de qualidade das águas superficiais no lago da barragem de Três Marias-MG","authors":"Ciro Couto Bento, G. Lima, H. Baggio, A. Horn","doi":"10.21715/gb2358-2812.2019334341","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019334341","url":null,"abstract":"O presente trabalho consiste em uma analise geoquimica ambiental da agua superficial para a identificacao de contaminacao no lago da Barragem da Usina Hidreletrica de Tres Marias da CEMIG, localizada na parte central-norte de Minas Gerais. Tem como proposta avaliar a situacao ambiental que se encontra a agua superficial da area de estudo, considerando as particularidades naturais e as caracteristicas antropicas da regiao. Este lago abrange oito municipios situados entre os paralelos 19,05oS e 18,20°S e os meridianos 44,95oW e 45,50oW. A amostragem de aguas superficiais foi feita em julho de 2018 em 58 pontos, distribuidos ao longo do segmento fluvial represado pela barragem hidreletrica. Analisaram-se os parâmetros quimicos totais (detergente; sulfato; amonia; nitrito; nitrato; fosforo; aluminio; zinco; ferro; manganes; boro) e os parâmetros fisico-quimicos in situ (temperatura, pH, condutividade eletrica, oxigenio dissolvido, total de solidos dissolvidos, turbidez, cor aparente). Os resultados foram comparados a Resolucao do Concelho Nacional de Meio Ambiente (CONAMA) 357/05 e Portaria do Ministerio da Saude (MS) n°518. Alguns resultados obtidos estao no limite dos valores estabelecidos pela legislacao, outros ultrapassam o limite, mostrando o potencial de suscetibilidade ambiental da area. Destaca-se negativamente a concentracao do Aluminio que ultrapassou em todos os pontos o limite legal. A concentracao do sulfato e dos compostos nitrogenados, nao ultrapassaram as concentracoes dos limite normativos. Quanto os parâmetros in situ somente o oxigenio dissolvido apresentou em desconformidade com as normas.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45738642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Interpretation of GPR (Ground Penetrating Radar) and soil profiles at selected veredas of the Formoso River Basin, Buritizeiro, Minas Gerais, Brazil 巴西米纳斯吉拉斯州Buritizeiro Formoso河流域选定veredas的探地雷达和土壤剖面的解释

Geochimica Brasiliensis Pub Date : 2020-02-23 DOI: 10.21715/gb2358-2812.2019334378

P. Aranha, A. Horn, P. Morais

引用次数: 0

Entrevistas e análise de metais pesados ao longo do rio Doce Doce河沿岸重金属访谈与分析

Geochimica Brasiliensis Pub Date : 2020-02-23 DOI: 10.21715/gb2358-2812.2019334394

C. Oliveira, B. Camilo

{"title":"Entrevistas e análise de metais pesados ao longo do rio Doce","authors":"C. Oliveira, B. Camilo","doi":"10.21715/gb2358-2812.2019334394","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019334394","url":null,"abstract":"Given a panorama of few studies that paralleled the perceptions of people affected by the Fundão dam rupture in Mariana, Minas Gerais, Brazil, and the concentrations of heavy metals present in the affected areas along the Doce River, this study aimed to identify this relationship. The methods used were semi-structured interviews with affected people and collection of water and sediment samples from the river along the Rio Doce basin to measure the concentration of heavy metals.The sediment was processed according to EPA 3051-16 (Environmental Protection Agency) method. Heavy metals in the water and sediment were analyzed with ICP-AES (Inductively Coupled Plasma Atomic Emission Spectrometry) and AAS (Atomic Absorption Spectrometry) at IGC / UFMG (Institute of Geosciences / Federal University of Minas Gerais) and COPASA (Minas Gerais Sanitation Company). Water samples showed excessive concentrations for Al (aluminum), Fe (iron) and Mn (manganese) in a Class II river according to CONAMA (National Environmental Council, 2009). Sediment samples contained Zn (zinc), Cr (chrome), Cu (copper) and Pb (lead) reversibly connected above the quality reference value according to CETESB (São Paulo State Environmental Company, 2005). The interviews were analyzed by the Content Analysis method and pointed to the misinformation of those affected in relation to the heavy metals in the Doce River. The study showed that the mud contributed to the contamination of heavy metals in the affected rivers, mainly by","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46861527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mobility of metals in river sediments from a watershed in the Iron Quadrangle, Brazil 巴西铁四合院流域河流沉积物中金属的流动性

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333273

L. Marques, D. Reis, Laura Pereira do Nascimento, E. G. Oliveira, A. Santiago, H. Roeser

{"title":"Mobility of metals in river sediments from a watershed in the Iron Quadrangle, Brazil","authors":"L. Marques, D. Reis, Laura Pereira do Nascimento, E. G. Oliveira, A. Santiago, H. Roeser","doi":"10.21715/gb2358-2812.2019333273","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019333273","url":null,"abstract":"The dynamics of the behavior of metals in freshwater environments has been one of the main focuses of environmental monitoring in the last years. The present study investigated the distribution of heavy metals in the river sediments of the Santa Bárbara River Watershed (Minas Gerais, Brazil). The study area suffered from problems related to mining and several high impact activities, such as farming, forestry, and reforestation for charcoal production. Surface sediments were collected at four points in the Conceição, Caraça, and Santa Bárbara rivers. These sediments were analyzed for exchangeable, reducible, oxidizible, and residual fractions through the sequential extraction procedure that was proposed by the European Community Bureau of Reference (BCR). The results indicate that the Cd and Pb are mostly present in the reducible fraction, while Fe, Ni, Cr, and Zn were predominantly found in the residual fraction, Mn and Cu are the elements that proportionally present more exchangeable fractions and greater mobility. Factors such as pH and redox potential influence several processes which alter the mobility of metals, such as adsorption and complexation. The values of these parameters have shown that the sampled points have reducing and acidic characteristics. The identification of the geochemical stages of metals in sediments allowed for the comprehension of the contamination in the medium and the identification of possible sources. This enables the assessment of the quality of the sediments in the studied watershed and serves as a reference for the monitoring of the anthropic effect to the environment.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46620925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Simulações de transporte reativo em um aquífero contaminado por querosene de aviação 航空煤油污染含水层反应运输模拟

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333260

E. Teramoto, H. K. Chang, Marcus Paulus Martins Bressa, Adriano Soriano

{"title":"Simulações de transporte reativo em um aquífero contaminado por querosene de aviação","authors":"E. Teramoto, H. K. Chang, Marcus Paulus Martins Bressa, Adriano Soriano","doi":"10.21715/gb2358-2812.2019333260","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019333260","url":null,"abstract":"The ability of native bacteria to biodegrade subsurface hydrocarbons has been studied consistently since the 1970s, since this class of contaminants may pose severe human health risks. Understanding the mechanisms that govern hydrocarbons biodegradation represents a crucial issue for the management of contaminated areas. For this reason, numerical simulations of reactive transport were performed to evaluate the conceptual geochemical model and to helpunderstand the mechanisms that govern BTEX biodegradation in a lateritic aquifer contaminated by large aviation fuel. The feasibility of previously proposed conceptual model linking geochemical zonation with BTEX mineralization and secondary reactions was evaluated by means of reactive transport models. The representation of the simulated chemical speciation of the studied hydrocarbon-contaminated aquifer is best supported when PCO 2 is fixed and dissolved oxygen, potentially present due to mass transfer from entrapped air, is considered in the model. These findings suggest the need for both constraints to be considered in the reactive transport models involving hydrocarbon biodegradation.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47993445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Análise da ação de ácidos sobre ictiólitos da Formação Santana, Cretáceo Inferior da Bacia do Araripe, Nordeste do Brasil 酸对巴西东北部阿拉普里特盆地下白垩统Santana组鱼鳞石的作用分析

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333303

G. Silva, Márcio Roberto Silva, Eduardo Ferreira de Oliveira, A. Gomes

引用次数: 0

Caracterização geoquímica do Estuário do Rio Una, BA, Brasil 巴西巴伊亚州乌纳河口的地球化学特征

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333286

Sheila Bonfim de Jesus, M. Cruz

{"title":"Caracterização geoquímica do Estuário do Rio Una, BA, Brasil","authors":"Sheila Bonfim de Jesus, M. Cruz","doi":"10.21715/gb2358-2812.2019333286","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019333286","url":null,"abstract":"With a vast estuarine area, southern Bahia (Brazil) has large natural resources. Estuaries aggregate various ecological dynamics that contribute significantly to ecosystem balance, bringing valuable sustainable resources to the community. These resources are now being drastically exploited in disarray, and local communities are the first to be harmed. Understanding and knowing the estuarine geochemical behavior allows us to identify environmental strategies for a balanced exploitation of these ecosystems. The present work aimed to geochemically characterize the low course of the Una River through the analysis of physical-chemical parameters in water (temperature, pH, dissolved oxygen, salinity, Eh, conductivity, turbidity and total dissolved solids) and metals (Ni, Cu, Cd, Pb and Cr) in water and suspended particulate matter. The samples were collected in the dry season in October 2012 and in the rainy season in May 2013. The highest values of metals were Ni, Cu and Pb in the suspended particulate matter. Cd was the only trace element present in the dissolved fraction, indicating a possibility of water contamination due to the surrounding anthropic activities. In general, the values of trace metals are considered high when compared with the established sediment indices.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49034150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Geochemical mapping based on regularly spaced composite stream sediment samples produced from stored aliquots - State of Paraná Pre-Cambrian shield, Brazil 基于从储存的等价物中产生的规则间隔复合水系沉积物样品的地球化学填图——巴西帕拉南<e:1>前寒武纪地盾状态

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333234

Fabio Crisigiovanni, O. Licht, V. Ferrari, C. Porto

引用次数: 1

Composição isotópica (δ18O, δ2H e δ13CCID) das águas subterrâneas dos municípios de Feira da Mata e Santana (BA) Feira da Mata和Santana市地下水的同位素组成（δ18O、δ2H和δ13CID）（BA）

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333313

Manuel Vitor Portugal Gonçalves, R. Santos, A. B. S. R. Junior, F. S. Batista, M. Cruz, Alexandre Barreto Costa, Mônica Pringsheim Cunha

{"title":"Composição isotópica (δ18O, δ2H e δ13CCID) das águas subterrâneas dos municípios de Feira da Mata e Santana (BA)","authors":"Manuel Vitor Portugal Gonçalves, R. Santos, A. B. S. R. Junior, F. S. Batista, M. Cruz, Alexandre Barreto Costa, Mônica Pringsheim Cunha","doi":"10.21715/gb2358-2812.2019333313","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019333313","url":null,"abstract":"Esta pesquisa pretendeu caracterizar a composicao isotopica das aguas subterrâneas dos municipios de Feira da Mata e de Santana, no oeste da Bahia, Brasil. Foram coletadas aguas em quinze pocos perfurados nas rochas pelito-carbonaticas do Grupo Bambui. As variaveis fisico-quimicas foram mensuradas in situ, por meio de sonda multiparâmetros, os cations por ICP-OES e os ânions por titrimetria e espectrofotometria. Os valores da razao isotopica em δ2H e δ18O destacaram o papel da recarga pelas chuvas locais, infiltracao rapida e pouca evaporacao. Tambem, revelaram que as aguas subterrâneas de Santana foram as mais evaporadas. A composicao isotopica em δ13CCID foi relacionada a um pequeno tempo de residencia da agua no aquifero, predominando valores similares a assinatura isotopica das plantas de ciclo fotossintetico C4 e das rochas carbonaticas. Esta tendencia foi corroborada pela caracterizacao hidroquimicas. A analise de agrupamentos mostrou que os grupos hidroquimicos se distinguiram quanto aos valores da mineralizacao, saturacao da solucao nos minerais calcita e dolomita e razao isotopica em δ13CCID nas amostras de Feira da Mata ou de Santana. As alteracoes nestas variaveis acompanham a evolucao geoquimica das aguas bicarbonatadas calcicas para as bicarbonatadas ou cloretadas sodicas, a partir das reacoes de troca de bases e da circulacao da agua no aquifero. A integracao dos resultados isotopicos, razoes geoquimicas, indice de saturacao e a estatistica multivariada revelou a relevância do intemperismo quimicos de carbonatos e pelitos a qualidade da agua.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49043375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aplicação de isótopos estáveis de carbono na avaliação da taxa de crescimento do coral Porites astreoides (Lamarck, 1816) do Atol das Rocas - Atlântico Sul 稳定碳同位素在评价南大西洋罗卡斯环礁珊瑚Porites astreoides (Lamarck, 1816)生长速率中的应用

Geochimica Brasiliensis Pub Date : 2019-09-29 DOI: 10.21715/gb2358-2812.2019333325

A. Santos, N. S. Pereira, A. N. Sial

{"title":"Aplicação de isótopos estáveis de carbono na avaliação da taxa de crescimento do coral Porites astreoides (Lamarck, 1816) do Atol das Rocas - Atlântico Sul","authors":"A. Santos, N. S. Pereira, A. N. Sial","doi":"10.21715/gb2358-2812.2019333325","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2019333325","url":null,"abstract":"Corals are often used as natural archives for climate research. These organisms have the ability to incorporate geochemical data into their exoskeletons, which can be used as proxies for different environmental variables. In this work, multiple carbon stable isotope profiles (δC) were used in different sections of a Porites astreoides (PTM-1) coral colony, collected at Rocas Atoll South Atlantic. This approach aims to verify the effectiveness of this method as an alternative for the evaluation of coral growth rate of the Scleractinia group. Such method is based on the idea that the coral δC varies according to the luminosity (i.e. cloud cover), which presents seasonal variability and leave the annual cycles recorded in the corals. Thus, the length of each isotopic cycle corresponds to the growth rate of a coral. In this work, 4 isotopic profiles with 0.5 mm sampling resolution were carried out. The δC cycles were used to evaluate the growth rate of the PTM-1 colony. The length of the δC cycles varied from 3 to 12 mm along the profiles and the overall average growth rate estimated for this colony was 6.69 ± 2.39 mm/year, close to those reported for this species in other species. regions, indicating the effectiveness of this method in assessing coral growth rate.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42190139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0