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Registros recuperados: 71
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A review of water quality and pollution studies in Tanzania OceanDocs
Mohammed, S.M..
Institute of Marine Sciences Zanzibar
Tipo: Journal Contribution Palavras-chave: Water quality; Water pollution.
Ano: 2002 URL: http://hdl.handle.net/1834/741
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Acute toxicity of commercial atrazine in Piaractus mesopotamicus: histopathological, ultrastructural, molecular, and genotoxic evaluation. Repositório Alice
PAIVA, P. P. de; DELCORSO, M. C.; MATHEUS, V. A.; QUEIROZ, S. C. do N. de; COLLARES-BUZATO, C. B.; ARANA, S..
The aim of this work was to evaluate the sensitivity of Pacu fingerlings (Piaractus mesopotamicus) by measuring the effects of median lethal concentration (LC50) of atrazine (ATZ - 28.58 mg/L) after acute exposure (up to 96 h). The fish were exposed to the LC50 of ATZ for 96 h (28.58 mg/L) in a static system. During the experiment, the fingerlings were randomly distributed in four glass tanks (50 L) containing dechlorinated water. Four glass tanks were for the control group, and four were for the ATZ-exposed group (n=4 per glass tank), given a total number of 16 animals tested per group. The genotoxicity was evaluated by micronucleus (MN) test in erythrocytes from peripheral blood. Qualitative and semi-quantitative histopathological analyses, and also...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Brazilian ichthyofauna; Kidney lesions; Liver lesions; Micronucleus test; Pacu; Herbicida; Toxidez; Poluição da água; Piaractus mesopotamicus; Water pollution; Atrazine; Oxidative stress; Nephrotoxicity; Hepatotoxicity.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1080546
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Acute toxicity tests of a textile mill wastewater effluent and a "detergent wash" with a Hermit crab (Climbinarius Africanus) (Aurivillius) OceanDocs
Ajao, E.A..
Bioassay tests were conducted with wastewater effluents from a textile mili and a detergent packing plant using the hermit crab. Clibinarius africanus. (Aurivillus) as experimental animal. LC50 values were evaluated using static testing procedures for 24, 48 and 96 hour. For the textile effluent, means of 79.0, 50.24 and 51.81 percentage effluent by volume were obtained in respect of crabs in the “medium” weight range (0.3 – 0.7grams) for the test periods. For the “detergent wash”, 95.16, 85.00 and 82.33 percentage effluent by volume represented means of values obtained for “small” size crabs (weight range 0.08–0.24 grams) and 96.0, and 81.50 percentage effluent by volume for ‘medium’ size crabs for 24, 48 and 96 hour respectively. Spearman’s Rank...
Tipo: Report Palavras-chave: Pollutants; Water pollution; Pollutants; Water pollution; Http://aims.fao.org/aos/agrovoc/c_6076; Http://aims.fao.org/aos/agrovoc/c_8321.
Ano: 1985 URL: http://hdl.handle.net/1834/2440
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Agricultura e qualidade da agua: contaminacao da agua por nitrato. Infoteca-e
RESENDE, A. V. de..
2002
Tipo: Documentos (INFOTECA-E) Palavras-chave: Qualidade da agua; Contaminacao; Nitrogenio; Fosforo; Recurso hidrico; Saude; Impacto ambiental; Poluicao da agua; Water quality; Contamination; Nitrogen; Phosphorus; Water resources; Nitrates; Health; Environmental impact; Water pollution; Eutrophication.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/546464
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Assessment of the water quality in a large reservoir in semiarid region of Brazil AGRIAMBI
Lopes,Fernando B.; Andrade,Eunice M. de; Meireles,Ana C. M.; Becker,Helena; Batista,Adriana A..
The aim of this study was to identify spatial and temporal variations in water quality of Orós reservoir, Ceará, Brazil, as well as the sources of contamination. To get this information the Principal Component Analysis (PCA) and Cluster Analysis (CA) was used. Water samples were collected at seven (geo-referenced) points, from April 2008 to March 2011, totalling 4,032 samples. The following attributes of the waters were analysed: temperature, pH, CE, Ca2+, Mg2+, Na+, K+, Cl-, HCO3-, SO4--, turbidity, colour, Sechi transparency, TS, TVS, TFS, TSS, VSS, FSS, TDS, DO, BO5D, total phosphorus, soluble orthophosphate, EC, TTC, total ammonia, TKN, nitrate, SAR and chlorophyll-a. The PCA promoted the reduction from the 32 initial variables to 14, accounting for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water quality; Water pollution; Multivariate statistics.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000400012
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Avaliação da toxicidade aguda de Piraclostrobin, Epoxiconazol e sua mistura em Daphnia similis. Repositório Alice
PRESTES, E. B.; JONSSON, C. M.; CASTRO, V. L. S. S. de.
No presente trabalho avaliou-se o efeito toxicológico (inibição da mobilidade) de formulações fungicidas à base de piraclostrobin e epoxiconazol, isoladamente e em formulação conjugada sobre Daphnia similis, mediante determinação da Concentração Efetiva Média (CE50-48h) de cada uma das formulações. Também foi determinado o possível efeito sinérgico ou antagônico que o uso conjugado dos dois fungicidas poderia exercer em relação à sua toxicidade. Foram encontrados valores de CE50-48h de 18,36 mg.L-1 para a formulação à base de piraclostrobin, de 89,98 mg.L-1 para a formulação à base de epoxiconazol e de 23,50 mg.L-1 para a formulação conjugada. Das três formulações estudadas, o piraclostrobin mostrou-se o mais tóxico para os organismos em estudo. A análise...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Piraclostrobin; Epoxiconazol Toxicidade; Daphnia similis; Alga; Fungicida; Impacto ambiental; Poluição da água; Toxidez; Fungicides; Water pollution; Toxicity; Environmental impact.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/981831
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Avaliação da toxicidade crônica de Piraclostrobin, Epoxiconazol e sua mistura em Daphnia similis. Repositório Alice
PRESTES, E. B.; JONSSON, C. M.; CASTRO, V. L. S. S. de; PARAÍBA, C. C. M..
Resumo O presente trabalho avaliou o efeito toxicológico de formulações fungicidas à base de piraclostrobin e epoxiconazol, isoladamente e em formulação conjugada sobre Daphnia similis por 21 dias, através da determinação da Concentração de Efeito Não Observado (CENO) de cada uma das formulações. Em relação à mortalidade de D. similis, foram encontrados valores CENO de 0,098 mg L-1 para a formulação à base de piraclostrobin; 1,324 mg L-1 para a formulação à base de epoxiconazol e 0,341 mg L-1 para a formulação conjugada. Em relação à alteração na relação neonatos/adulto foram encontrados valores CENO de 0,579 mg L-1 para a formulação à base de piraclostrobin; 3,599 mg L-1 para a formulação à base de epoxiconazol e 0,623 mg L-1 para a formulação conjugada....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Daphnia similis; Epoxiconazol; Piraclostrobin; Toxicidade; Alga; Fungicida; Impacto ambiental; Poluição da água; Toxidez; Environmental impact; Fungicides; Water pollution; Toxicity.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/963107
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Avaliação da toxicidade de Piraclostrobin, Epoxiconazol e sua mistura em alga Pseudokirchneriella subcapitata. Repositório Alice
PRESTES, E. B.; JONSSON, C. M.; CASTRO, V. L. S. S. de.
Resumo: Estudou-se o efeito toxicológico (inibição de crescimento) de formulações fungicidas à base de piraclostrobin e epoxiconazol, isoladamente e em formulação conjugada, sobre a alga Pseudokirchneriella subcapitata mediante determinação da Concentração Efetiva Média (CE50-72 h) dos princípios ativos de cada uma das formulações. Foram encontrados valores de CE50- 72 h de 5,57 mg.L-1 para a formulação à base de piraclostrobin, de 1,14 mg.L-1 para a formulação à base de epoxiconazol e de 0,20 mg.L-1 para a formulação conjugada. O piraclostrobin apresentou menor toxicidade às algas em relação aos dados encontrados na literatura, o epoxiconazol resultados semelhantes e a mistura maior toxicidade. A análise isobolográfica e a determinação do Índice de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Piraclostrobin; Epoxiconazol; Toxicidade; Pseudokirchneriella subcapitata; Fungicida; Toxidez; Alga; Poluição da água; Impacto ambiental; Fungicides; Toxicity; Selenastrum capricornutum; Water pollution; Environmental impact.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/931715
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Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation BABT
Gonzalez,Alessandra M.; Paranhos,Rodolfo; Andrade,Luciana; Valentin,Jean L..
The aim of this work was to evaluate the necessary ³H-leucine concentration to estimate bacterial production in Guanabara Bay through saturation curves. A second aim was to collect preliminary data of bacterial production in two distinct sites corresponding to different water qualities: Urca inlet and Governador Island. Saturation curves were made with water samples taken at the main circulation channel of the bay, Paquetá Island, and the two sites mentioned before. The ³H-leucine curves showed similar pattern for all studied areas, indicating the ideal isotope concentration to be 10 nM. Bacterial biomass production ranged from 0.40 to 4.53 µgC L-1 h-1 in Urca and from 3.86 to 73.72 µgC L-1 h-1 in Governador Island indicating the relationship between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Activity measurement; Heterothrophic production; Estuary; Water pollution; Eutrophication.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500008
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Bioconcentrations of herbicides used in sugarcane crops in tilapia (Oreochromis niloticus) and the risk for human consumption. Repositório Alice
JONSSON, C. M.; MOURA, M. A. M. de; FERRACINI, V. L.; PARAIBA, L. C.; ASSALIN, M. R.; QUEIROZ, S. C. do N. de.
The practice of intensive herbicide use in the sugarcane industry has a high risk of compromising the quality of the water and the organisms that live there due to losses through runoff, leaching and other processes. In this work, the dynamics of four herbicides present in three different mixtures were evaluated through their incor- poration and elimination in the muscle tissue of tilapia (Oreochromis niloticus). The highest mean values of bio- concentration factors were 1.730 for ametryn, 0.891 for tebuthiuron, 0.322 for hexazinone and 4.783 for diuron. Diuron presented the highest risk regarding the consumption of tilapia fillets by the population. However, considering that the fish would reach maximum levels of diuron when exposed to extremely high...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Herbicida; Poluição da Água; Tilápia; Toxicologia de Alimento; Herbicide residues; Water pollution; Oreochromis; Chemical hazards; Chemical risk assessment; Ecotoxicology; Food safety; Acceptable daily intake.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1115211
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Chemical and ecotoxicological assessments of water samples before and after being processed by a water treatment plant. Repositório Alice
MONTEIRO, R. T. R.; SILVA, G. H. da; MESSIAS, T. G.; QUEIROZ, S. C. do N. de; ASSALIN, M. R.; SOUZA, D. R. C. de; ALVES, C. H. R.; FERREIRA, A. C.; BLAISE, C..
Abstract; Physicochemical and ecotoxicological measurements were employed to appraise the water quality of the Corumbataí River raw water (RW) intake, and that of its filtered (FW) and treated (TW) waters, processed by the Water Treatment Plant (WTP) of Piracicaba (SP, Brazil) during 2010. Some herbicides: ametrine, atrazine, simazine and tebuthiuron, were measured, with levels ranging from 0.01 to 10.3 microgram-g L-1. These were lower than those required to produce ecotoxicological effects to aquatic life based on published literature. Similarly, trihalomethanes, such as chloroform and bromodichloromethane produced as a result of the WTP process were also shown to be present in concentrations that would neither harm environmental nor human health....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Resíduos de herbicidas; Trihalometanos; Água tratada; Qualidade da água; Poluição da água; Análise química; Análise física; Toxidez; Organismo aquático; Daphnia magna; Water pollution; Pesticide residues.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/997184
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Colombia's Discharge Fee Program: Incentives for Polluters of Regulators? AgEcon
Blackman, Allen.
Colombia's discharge fee system for water effluents is often held up as a model of a well-functioning, economic-incentive pollution control program in a developing country. Yet few objective, up-to-date evaluations of the program have appeared. Based on a variety of primary and secondary evaluative data, this paper finds that that the program has been beset by a number of serious problems including limited implementation in many regions, widespread noncompliance by municipal sewage authorities, and a confused relationship between discharge fees and discharge standards. Nevertheless, in several watersheds, pollution loads dropped significantly after the program was introduced. While proponents claim the incentives that discharge fees created for polluters...
Tipo: Working or Discussion Paper Palavras-chave: Environment; Economic incentive; Market based instrument; Discharge fees; Water pollution; Latin America; Colombia; Environmental Economics and Policy; Q53; Q56; Q58; O13; O54.
Ano: 2005 URL: http://purl.umn.edu/10869
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Comparison between four and seven-day Ceriodaphnia dubia survival and reproduction test protocols using oil refinery effluent samples. Repositório Alice
OLIVEIRA-FILHO, E. C.; DA-MATTA, A. C.; CABRAL, L. L.; VEIGA, L. F.; PAUMGARTTEN, F. J. R..
The aim of this study was to compare the 7-day Ceriodaphnia dubia survival and reproduction test with a 4 day test to evaluate the toxicity of oil refinery effluents. Both shown identical NOECs with three of 6 tested samples. With one of the tested samples, the 4-day NOEC was one tested-concentration lower, and with the remaining two samples, it was one tested-concentration higher than those obtained using the 7-day protocol. Then results suggested that 4 and 7-day protocols were comparable to detect toxic effects.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Toxicologia aquática; Poluição da água; Ecotoxicologia; Ceriodaphnia dúbia; Reprodução; Efluentes de refinaria de petróleo; Aquatic toxicology; Water pollution; Ecotoxicology; Oil refinery effluents; Reproduction; Aquatic chronic tests.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/571661
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Comparison between four and seven-day Ceriodaphnia dubia survival and reproduction test protocols using oil refinery effluent samples BABT
Oliveira-Filho,Eduardo Cyrino; Da-Matta,Anndressa Camillo; Cabral,Lucianna Lopes; Veiga,Letícia Falcão; Paumgartten,Francisco José Roma.
The aim of this study was to compare the 7-day Ceriodaphnia dubia survival and reproduction test with a 4 day test to evaluate the toxicity of oil refinery effluents. Both shown identical NOECs with three of 6 tested samples. With one of the tested samples, the 4-day NOEC was one tested-concentration lower, and with the remaining two samples, it was one tested-concentration higher than those obtained using the 7-day protocol. Then results suggested that 4 and 7-day protocols were comparable to detect toxic effects.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic toxicology; Water pollution; Ecotoxicology; Oil refinery effluents; Reproduction; Aquatic chronic tests.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100017
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Contaminación del agua con nitratos y nitritos y su impacto en la salud pública en la zona de influencia del módulo de riego (I-1) La Antigua, Ver. México. Colegio de Postgraduados
Galaviz Villa, Itzel.
La contaminación de las aguas emerge como una consecuencia de los asentamientos humanos y de las actividades rurales, agrícolas, silvícolas e industriales en una región. Se ha encontrado que al incrementarse el uso de fertilizantes nitrogenados también se produce un mayor impacto contaminante en las aguas. Los nitratos y nitritos disueltos en agua subterránea, destinada al consumo humano, ocasionan efectos negativos en la salud, tales como; la producción de nitrosaminas (causa del cáncer) y la disminución de la capacidad de transporte de oxígeno por la sangre, conocida como síndrome del bebe azul. El objetivo del presente estudio fue determinar la relación entre la concentración de nitratos y nitritos disueltos en el agua de consumo humano, y la incidencia...
Palavras-chave: Agroecosistemas; Fertilizantes nitrogenados; Contaminación del agua; Cáncer; Agroecosystems; Nitrogen fertilizers; Water pollution; Cancer; Doctorado; Agroecosistemas Tropicales.
Ano: 2010 URL: http://hdl.handle.net/10521/429
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Contamination de l'estuaire et de la baie de Seine par le PCB-Bilan des etudes ArchiMer
Abarnou, Alain; Simon, S.
This report is a synthesis of data concerning PCB concentrations in water, sediments and organisms (Bivalvia, Malacostraca, Pisces). Water analysis shows that Seine River is the primordial factor affecting PCB dispersion in the bay. Sediment contamination is higher near estuary along Calvados coast. PCB levels in Mytilidae and in Pectinidae set the problem of polluant origin, dispersion and effects on estuarine organisms.
Tipo: Text Palavras-chave: Bioaccumulation; Sediment pollution; Water pollution; PCB; Environmental impact.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1319.pdf
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Contiguous urban rivers should not be necessarily submitted to the same management plan: the case of Tietê and Pinheiros Rivers (São Paulo-Brazil) Anais da ABC (AABC)
Cunha,Davi G. F.; Grull,Doron; Damato,Murilo; Blum,José R. C.; Eiger,Sergio; Lutti,José E.I.; Mancuso,Pedro C. S..
The management of urban water resources plays an important role for developing countries. The Tietê and Pinheiros Rivers (São Paulo, Brazil) are affected by domestic and industrial effluents and by the diffuse pollution. This research aimed to quantify 134 variables in the water of Tietê and Pinheiros Rivers (approximately 7,200 and 6,600 analyses, respectively) from August 2007 to December 2008. The idea was to verify if the fact that both rivers are located in the same basin is enough to consider the application of a single management plan for both. Data showed that the rivers presented significant anthropogenic interference. The results suggested that such rivers must be subjected to individual management plans since there were exclusive occurrences...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental monitoring; Metropolitan region of São Paulo (MRSP); Urban rivers; Water pollution; Water quality; Watershed management.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400032
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Copper toxicity for Scinax ruber and Rhinella granulosa (Amphibia: Anura) of the Amazon: Potential of Biotic Ligand Model to predict toxicity in urban streams Acta Amazonica
Franco-de-Sá,Jorge Felipe Oliveira; Val,Adalberto Luis.
In the last years many populations of anurans have declined and extinctions have been recorded. They were related to environmental pollution, changes of land use and emerging diseases. The main objective of this study was to determine copper sensitivity of the anuran of the Amazon Rhinella granulosa and Scinax ruber tadpoles at stage 25 and Scinax ruber eggs exposed for 96 h to copper concentrations ranging from 15 µg Cu L-1 to 94 µg Cu L-1. LC50 at 96 h of Rhinella granulosa Gosner 25, Scinax ruber Gosner 25 and Scinax ruber eggs in black water of the Amazon were 23.48, 36.37 and 50.02 µg Cu L-1, respectively. The Biotic Ligand Model was used to predict the LC50 values for these species and it can be considered a promising tool for these tropical species...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amphibian; LC50-96h; Copper; BLM; Water pollution.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400010
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Degradation of the riparian wetlands in the Lake Victoria basin - Yala swamp case study OceanDocs
Thenya, Thuita; Wassmann, Reiner; Verchot, Louis; Mungai, David.
Land degradation is as a result of broad range of scales and factors, which include biophysical, climatic, demographic and socio-economic. The aim of this paper was to provide an analysis of wetland utilisation, ecosystem degradation and their effect on the Lake Victoria (Kenya) ecosystem. This involved analysis of socioeconomic and remote sensed data. The main sources of wetland degradation in the Lake Victoria basin were identified as (1) farming activities, (2) grazing and macrophyte harvesting and (3) coupled with catchment degradation-deforestation. These factors were closely related to the demographic dynamics and unsustainable land utilisation practices. Socio-economic data provided valuable insight on the pattern of wetland utilisation and possible...
Tipo: Proceedings Paper Palavras-chave: Riparian environments; Degradation; Wetlands; Inland waters; Catchment area; Remote sensing; Environmental effects; Socioeconomic aspects; Resource development; Sediment transport; Silting; Water pollution; Wetlands; Deforestation; Natural resources; Utilization; Land use; Pollutants.
Ano: 2006 URL: http://hdl.handle.net/1834/5313
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Desenvolvimento e validação de um método multiresíduo para determinação de pesticidas em água utilizando extração em fase sólida (SPE) e GC-MS/MS. Repositório Alice
SOUZA, D. R. C. de; FERRACINI, V. L.; QUEIROZ, S. C. do N. de; VILHENA, E.; NARDOCCI, A. C..
Um método para determinação multiresíduo de pesticidas baseado em cromatografia gasosa acoplada à espectrometria de massa (GC-MS/MS) foi desenvolvido, otimizado e validado para análises em amostras de águas. Foi utilizada extração em fase sólida (SPE- solid phase extraction) para concentrar as amostras em 1000 vezes e, alcançar a detectabilidade desejada. Para definir o procedimento de extração, foram avaliados parâmetros como pH e solvente de eluição. A melhor condição obtida foi validada depois de estabelecidos as seguintes condições otimizadas: pH= 7.0 e solvente de eluição diclorometano. O efeito matriz foi avaliado comparando-se a curva no solvente com a curva na matriz. O método proposto resultou no limite de detecção (LD) de 0,02µg/L e de...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: SPE; Validação; Agrotóxico; Resíduo; Análise química; Cromatografia gasosa; Espectrometria; Água; Pesticide residues; Gas chromatography; Mass spectrometry; Water pollution.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1084741
Registros recuperados: 71
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