Spatial Distribution of Mercury Concentration in Suspension Solids of the Upper Madeira River, Rondônia

Gomes, João Paulo de Oliveira; Nascimento, Elisabete Lourdes do; Almeida, Renato Paes de; Bastos, Wanderley Rodrigues; Bernardi, José Vicente Elias; Barros, P. R. H. B. De

doi:10.5132/jbse.2006.02.008

Cited by 4 publications

(4 citation statements)

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“…The results obtained for the herbivorous fighters surprised, therefore, it was expected higher concentrations of HgMe for the species P. unifilis and P. expansa, because they are chelonians that feed on algae and other vegetal proteins deposited in the sediment of the river, in the same way that a greater concentration of capybara was suspected, since this animal usually lives in regions bordering rivers and uses them as a hiding place and protection against natural predators, as well as for reproduction, thus, it has a greater contact with the sediment of rivers. This result was expected since other studies (Almeida et al, 2014;Vergotti et al, 2009;Gomes et al 2006;Lechler et al, 2000) showed that the bottom sediments are the abiotic accumulates mercury in the Amazonian rivers. It is suggested, therefore, the importance of conducting further research aimed at understanding the behavior of mercury in the wild animal organism.…”

Section: Fig 2 -Mean Concentrations Of Hgme In Fish Muscle Tissue By Dietary Habitsupporting

confidence: 65%

Risk Assessment to the Health of Amazonian Indigenous For the Consumption of Fish, Meat of Hunts and Vegetables Containing Metylmercury

de.¹,

Bastos²,

M.C.N.³

et al. 2018

IJAERS

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This study was to evaluate the exposure to methylmercury (HgMe) and the potential health risk of Tupari Indians through the consumption of their main foods. Were collection of samples of plant foods and muscle tissue from different species of fish and wild animals consumed in three villages of the Rio Branco Indigenous Land in Rondônia, in the Brazilian Amazon. The HgMe was measured in an atomic fluorescence spectrophotometer with gas chromatography. The statistical treatment of the data was performed by software R. Of the six different plant species, only sweet potato (Ipomoea batatas) had mean concentrations of HgMe above the limit of detection of the analytical technique for the three villages. There was a significant difference in the levels of HgMe between the species of wild animals and fish belonging to the same alimentary habit. Carnivores presented higher levels of HgMe than those obtained for non-predators, both for fish and for wild animals. The results of the assessment of the potential risk to indigenous health indicated a total HgMe of the weekly ingestion rate (WIR) of between 8.4 and 15.0 μg / kg of body weight for the villages evaluated, extrapolating all reference doses ( RfD) regarding for the Provisional Tolerable Weekly Intake (PTWI). The risk quotients (RQ) varied from 5.3 to 21.4, considerably exceeding the limit (RQ ≤ 1), which allows to consider the impossibility of toxic effects of HgMe. The fishes accounted for the highest percentage of WIR of HgMe for all villages, with an emphasis on predatory species. Considering the nutritional value of fish meat, it is suggested the continuity of the consumption of this meat in the villages with preference for non-carnivores.

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Section: Fig 2 -Mean Concentrations Of Hgme In Fish Muscle Tissue By Dietary Habitsupporting

confidence: 65%

Risk Assessment to the Health of Amazonian Indigenous For the Consumption of Fish, Meat of Hunts and Vegetables Containing Metylmercury

de.¹,

Bastos²,

M.C.N.³

et al. 2018

IJAERS

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“…Como o lago Puruzinho possui grande carga de matéria orgânica em decomposição, principalmente nos período de cheia, podese classificá-lo com um lago de água preta (Sioli & Klinge, 1964), caracterizado por baixos valores de pH. A condutividade foi maior na coleta de outubro de 2004 (15,2 µS cm -1 ) e menor nas coletas de fevereiro de 2004 (8,3 µS cm -1 ) e maio de 2005 (9,2 µS cm -1 ) No período de seca, o lago Puruzinho passa a receber influência da água branca do rio Madeira, e este, rico em sólidos em suspensão (Gomes et al, 2006), tende a elevar os valores de condutividade do lago Puruzinho. Apesar de o presente estudo ter avaliado Hg total, é possível observar pelos parâmetros físicos e químicos da água que o lago Puruzinho apresenta características favoráveis à metilação do Hg (Lacerda & Solomons, 1992), como baixos valores de pH e oxigênio dissolvido e elevadas temperaturas.…”

Section: Resultsunclassified

Mercury in the Plankton of an Amazon Natural Lake, Puruzinho Lake (Brazil)

Nascimento¹,

Gomes²,

Almeida³

et al. 2007

Ecotoxicol. Environ. Contam.

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RESUMO O presente trabalho teve por objetivo avaliar as concentrações de mercúrio total (Hg) em amostras de plâncton do lago Puruzinho, localizado à margem esquerda do rio Madeira, a 20 km da cidade de Humaitá (Amazonas, Brasil). Foram realizadas três amostragens em um ponto central do lago (S07°22'19,2"; W063°02'32,2"), que correspondem aos períodos chuvoso (fevereiro de 2004 e maio de 2005) e seco (outubro de 2004). As amostras de plâncton foram coletadas com o uso de duas redes de náilon, sendo que uma alíquota do concentrado de plâncton de cada rede utilizada foi fixada para posterior identificação e contagem dos organismos e outra foi liofilizada para a análise de Hg. A determinação de Hg foi realizada por espectrofotometria de absorção atômica por geração de vapor frio (FIMS-400). A maior concentração de Hg no plâncton foi observada na coleta de fevereiro de 2004 (337 µg kg-1), período chuvoso. Os níveis encontrados no plâncton do lago Puruzinho são comparáveis aos encontrados em estudos de regiões consideradas impactadas por Hg. Com a inundação da vegetação marginal (igapó) durante os períodos de chuva, pode ter ocorrido no lago a entrada de mercúrio associado às partículas de solo por meio do processo de lixiviação, bem como a ressuspensão do mercúrio adsorvido no sedimento de fundo, disponibilizando este metal para a comunidade planctônica.

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“…In the waters of the Madeira River, the concentrations found of both Hg and MeHg are within the range reported in the Amazon region by several authors (Pfeiffer et al, 1991;Aula et al, 1995; Biota sediment accumulation factor: BSAF; THg: total Hg; MeHg: methylmercury; S: sediment; SS: suspended solids; Ppk: Phytoplankton; Zpk: Zooplankton; BM: benthic macroinvertebrates; a,b,c: different letter superscripts denote statistically significant differences by Bonferroni correction test; we accepted p < .05 as statistically significant. Malm et al, 1989;Kannan et al, 1998;Bastos et al, 2006). It seems that past anthropogenic sources of Hg associated with gold extraction and hydroelectric reservoirs (in the Madeira River) had less impact on the measured Hg variables than the natural environmental conditions associated with water pH (Table 1).…”

Section: Discussionmentioning

confidence: 98%

“…1). Its main course is mostly "white" water from the Andean piedmont, running through sedimentary and metamorphic rocks (Gomes et al, 2006;Queiroz et al, 2011). Clear waters are found in ancient formations such as areas of the Shields (Irion, 1984).…”

Section: Introductionmentioning

confidence: 99%

Distribution and availability of mercury and methylmercury in different waters from the Rio Madeira Basin, Amazon

Vieira

Bernardi

Dórea

et al. 2018

Environmental Pollution

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Waters from the Amazon Basin have distinct physicochemical characteristics that can be optically classified as "black", "clear" and "white". We studied the distribution of total-Hg (THg) and methyl-Hg (MeHg) in these waters and respective suspended solids, sediment, phytoplankton, zooplankton, and benthic macroinvertebrates (BM) in the Madeira River Basin. Compared with the other types of water, the more acidic "black" kind had the highest THg and MeHg concentrations. The trend (black > clear > white) occurred for the concentrations of THg and MeHg in sediments and in the biotic compartment (plankton, macroinvertebrates). Organic Hg accounted for a small percentage (0.6-0.4%) of the THg in sediments but was highest in water (17-15%). For plankton and BM, the biota sediment accumulation factor (BSAFs) of MeHg (53-125) were greater than those of THg (4.5-15); however, the BSAF trend according to water type (black > clear > white) was only significant for MeHg. Sediment THg is correlated with all forms of Hg in biotic and abiotic matrices. The results indicate that water acidity in the Amazon is an important chemical characteristic in assessing Hg contamination of sediments and bioaccumulation in the aquatic food web. The differences in the BSAFs between THg and MeHg support the use of this factor for evaluating the bioaccumulation potential of sediment-bound Hg. The results add information critical to assessing environmental and health risks related to Hg methylation and potential fish-MeHg contamination, especially in tropical aquatic environments.

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Spatial Distribution of Mercury Concentration in Suspension Solids of the Upper Madeira River, Rondônia

Cited by 4 publications

References 5 publications

Risk Assessment to the Health of Amazonian Indigenous For the Consumption of Fish, Meat of Hunts and Vegetables Containing Metylmercury

Risk Assessment to the Health of Amazonian Indigenous For the Consumption of Fish, Meat of Hunts and Vegetables Containing Metylmercury

Mercury in the Plankton of an Amazon Natural Lake, Puruzinho Lake (Brazil)

Distribution and availability of mercury and methylmercury in different waters from the Rio Madeira Basin, Amazon

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