Mercury in fish and sediment of Purus River, Acre State, Amazon

Castro, Nathália Santos Serrão de; Braga, Camila Margalho; Trindade, Paulo Arthur de Abreu; Giarrizzo, Tommaso; Lima, Marcelo de Oliveira

doi:10.1590/1414-462x201600030142

Cited by 17 publications

(13 citation statements)

References 24 publications

(27 reference statements)

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“…454/2012 for sediments, in which Hg values below 170 ng g −1 present a low probability of adverse effects on biota and Hg concentrations above 486 ng g −1 would cause effects on organisms exposed to Hg. However, Castro et al (2016) found low concentrations of Hg in sediments but detected higher concentrations in the muscles of carnivorous fish.…”

Section: Resultsmentioning

confidence: 89%

Mercury in the Sediment of the Upper Parnaíba River

et al. 2018

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The contamination of aquatic environments with chemical trace elements can be evaluated by their accumulation in sediments of the water body. Studies on mercury require the use of exclusive extraction techniques that have relatively high costs when compared to the analysis of other trace elements. This study was conducted aiming at determining the mercury concentration in sediments of the Upper Parnaíba River basin, located in a region of agricultural expansion between the states of Piauí and Maranhão. The sediment was collected at 12 sites in the basin. After drying, the quantification of total mercury was performed by the Zeeman atomic absorption spectrometry coupled to a pyrolysis reactor. Mercury concentrations in sediments of the Parnaíba River ranged from 4.2 to 58.5 ng g −1 and presented a low probability of adverse effects on biota. Mercury had no correlation with the variables clay, silt, sand, total organic carbon, iron, and aluminum, demonstrating its possible anthropogenic origin. Although mercury concentrations have a low probability to disturb the balance of the local ecosystem, there is a need for monitoring the region in order to quantify the risks to biota and human health.

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Section: Resultsmentioning

confidence: 89%

Mercury in the Sediment of the Upper Parnaíba River

et al. 2018

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“…In this context, it is important to emphasize the need for further studies to quantify the risks to aquatic biota and human health in the Pelotas River basin. Castro et al, 2016 *This study; Impact: human activities conducted in the drainage basins correlated to the increase of Hg concentration in the sediments of their respective rivers, as cited by the authors. M: gold mining; GO: organomercurial fungicides; A: Agriculture; I: Industrial production of chloride and soda; NR: non-reported group.…”

Section: Resultsmentioning

confidence: 97%

“…Therefore, the concentrations found in the Pelotas River show a low probability of risk to the biota. Nevertheless, Castro et al, (2016) demonstrated the bioaccumulation potential of Hg when studying the Purus River. These researchers found Hg concentrations between 38 and 65 ng g -1 in the sediment of the Purus River, while in carnivorous fish muscle, it reached up to 5384 ng g -1 , with an average of 927 ng g -1 .…”

Section: Resultsmentioning

confidence: 99%

Mercury in the Sediment of Pelotas River Basin, Brazil

et al. 2018

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Many studies have determined the concentration of trace elements in river sediments in Brazil. Notwithstanding, mercury assessments are scarce, especially because of exclusive extraction techniques and expensive analysis techniques. Still, this element is known for its toxicity, persistence, and bioaccumulation, making its presence in the environment an important factor for biota and human health. For this reason, the objective of this study was to determine the mercury concentration in the sediment of the Pelotas River basin, located on the border of the states of Santa Catarina and Rio Grande do Sul. The sediment was collected at eight locations of the Pelotas basin and, after drying, the mercury was quantified by atomic absorption spectrometry based on the Zeeman-background correction, coupled to a pyrolysis reactor. The mercury concentrations in the sediments of the Pelotas River varied from 40.5 ng g-1 to 62.0 ng g-1 and presented a positive correlation with the fraction of silt and clay. The concentrations of mercury found in sediments of the Pelotas River basin have a low probability of negatively affecting the biota. Nonetheless, given the persistence and bioaccumulation potential of this element, the aforementioned region needs further studies to quantify the risks it may cause on the local biota and human health.

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“…According to World Health Organization (WHO, 2006), recommended safety limit for fish consumption is 0.5 mg/kg of mercury. However, in Brazilian Amazon, studies have shown several fish species (carnivores, omnivores, planktivores, and piscivores) above this threshold limit (Kasper et al, 2012;Bastos et al, 2015;Castro et al, 2016;Lino et al, 2018). In Manuel Hydroelectric reservoir on Jamari River, carnivorous fish species presented high levels of mercury concentration upstream (0.545 mg/kg) and downstream of reservoir (1.366 mg/ kg; Kasper et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Mercury concentrations in fish and human health assessment in preflood phase of a hydro dam in Teles Pires River, Southern Brazilian Amazon

Matos

Correa

Silva

et al. 2021

Elementa: Science of the Anthropocene

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Ingestion of fish is considered the main pathway of human exposure to methylmercury (MeHg), particularly for riverside populations, where fish is the main source of protein. The objective of this study was to estimate concentration of MeHg based on total concentration of mercury in muscles of three species of carnivorous fish: Boulengerella cuvieri (bicuda), Serrasalmus rhombeus (piranha), and Hydrolycus armatus (cachorra), collected from Teles Pires River, Brazil. Furthermore, we calculated human health risk related to MeHg contamination caused by fish consumption. Fish were collected in 20 field campaigns from December 2011 to September 2016 at Teles Pires River, in area of influence of Colíder hydroelectric plant. Risk index (RI) related to ingestion of MeHg through fish intake was calculated considering that MeHg corresponds to around 90% of mercury in fish. There were no significant differences in average mercury concentration between all species: S. rhombeus (0.304 mg/kg–1), H. armatus (0.229 mg/kg–1), and B. cuvieri (0.199 mg/kg–1). RI calculated for sensitive groups (lactating women, breastfeeding infants and children) and RI calculated for general population presented average values, suggesting adverse health effects. This first assessment on MeHg and human exposure to people from Teles Pires River area through fish consumption suggests that mercury concentrations might be posing health adverse effects on people of this sensitive group. Further studies involving more fish specimens and considering fish biological factors are needed to fully understand health risks of mercury exposure to humans in this region.

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Mercury in fish and sediment of Purus River, Acre State, Amazon

Cited by 17 publications

References 24 publications

Mercury in the Sediment of the Upper Parnaíba River

Mercury in the Sediment of the Upper Parnaíba River

Mercury in the Sediment of Pelotas River Basin, Brazil

Mercury concentrations in fish and human health assessment in preflood phase of a hydro dam in Teles Pires River, Southern Brazilian Amazon

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