scholarly journals Dynamics of exposure to mercury in a population of the upper Madeira River, Rondônia – Brazil

2021 ◽  
Vol 17 (4) ◽  
Author(s):  
Clarisse Vasconcellos Serra ◽  
Tania Machado Silva ◽  
José Vicente Elias Bernardi
Keyword(s):  
Total Mercury ◽  
Social Dynamics ◽  
Geographic Location ◽  
Direct Analysis ◽  
Atomic Spectroscopy ◽  
Urban Dynamics ◽  
Federal Highway ◽  
Hair Samples ◽  
Madeira River ◽  
Basin Region

This work evaluates the influence of cognitive and sociodemographic functions on the dynamics of human exposure to mercury in communities on the upper Madeira River in the state of Rondônia, Brazil. In this longitudinal epidemiological study of convenience sampling (2009 to 2019), semi-structured questionnaires on cognitive and sociodemographic aspects were applied to 1,089 participants (646 men and 443 women) divided into 6 groups with distinct geographic characteristics and lifestyles. Total mercury concentrations in hair samples were determined by direct analysis using atomic spectroscopy. In this population, cognitive (memory, attention span, concentration and difficulties in reading,  writing and mathematical calculations) and sociodemographic (location, gender, age, education, alcohol consumption, smoking habits, time of residence in the region, occupation) grouping showed the differentiation between the groups with lifestyle directly related and dependent on extractivism/gold mining dispersed along the Madeira River (G1 and G2), and the groups that have urban dynamics on the margins of the federal highway BR-364 (G3, G4, G5 and G6). Sex, age and lifestyle (groups) were significant indicators of total mercury concentrations in hair. The organization of participants according to cognitive and sociodemographic profiles, regardless of geographic location, highlights the contribution of individualized social dynamics to mercury exposure in the Madeira River basin region. Despite socio-historical and socio-economic similarities, cognitive and sociodemographic functions show individualized social behaviors within communities, which may influence the process of exposure to THg.

scholarly journals Hair Mercury Levels Detection in Fishermen from Sicily (Italy) by ICP-MS Method after Microwave-Assisted Digestion

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Giuseppe Giangrosso ◽  
Gaetano Cammilleri ◽  
Andrea Macaluso ◽  
Antonio Vella ◽  
Nicolantonio D’Orazio ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Total Mercury ◽  
Control Group ◽  
Inductively Coupled ◽  
Hair Mercury ◽  
Icp Ms ◽  
Hair Samples ◽  
Significant Difference ◽  
Close Relationship ◽  
Plasma Mass Spectrometry

A number of ninety-six hair samples from Sicilian fishermen were examined for total mercury detection by an Inductively Coupled Plasma Mass Spectrometry (ICP-MS) method. The mercury levels obtained were compared with mercury levels of 96 hair samples from a control group, in order to assess potential exposure to heavy metals of Sicilian fishermen due to fish consumption and closeness to industrial activities. Furthermore, the mercury levels obtained from hair samples were sorted by sampling area in order to verify the possible risks linked to the different locations. The overall mean concentration in the hair of the population of fishermen was6.45±7.03 μg g−1, with a highest value in a fisherman of Sciacca (16.48 μg g−1). Hair mercury concentration in fishermen group was significantly higher than in control group (p<0.01). There was no significant difference in hair total mercury concentrations between sampling areas (p>0.05). The results of this study indicate a greater risk of exposure to mercury in Sicilian fishermen, in comparison to the control population, due to the high consumption of fish and the close relationship with sources of exposure (ports, dumps, etc.).

scholarly journals Selenium and mercury in the hair of raccoons (Procyon lotor) and European wildcats (Felis s. silvestris) from Germany and Luxembourg

Ecotoxicology ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Danuta Kosik-Bogacka ◽  
Natalia Osten-Sacken ◽  
Natalia Łanocha-Arendarczyk ◽  
Karolina Kot ◽  
Bogumiła Pilarczyk ◽  
...  
Keyword(s):  
Negative Correlation ◽  
Mercury Concentration ◽  
Total Mercury ◽  
Procyon Lotor ◽  
Dry Weight ◽  
Significant Negative Correlation ◽  
Molar Ratio ◽  
Total Mercury Concentration ◽  
Hair Samples

AbstractThis study examined the concentration of total mercury (THg) and selenium (Se), as well as the molar ratio of Se:THg in hair samples of terrestrial animals. THg and Se concentrations were measured from the hair of raccoons (Procyon lotor) and European wildcats (Felis s. silvestris) from Germany and Luxembourg. Median THg concentrations in hair from raccoons and wildcats were 0.369 and 0.273 mg kg−1 dry weight (dw), respectively. Se concentrations were higher in the hair of raccoons than of wildcats (0.851 and 0.641 mg kg−1 dw, respectively). Total mercury concentration in hair of raccoons from Luxembourg was almost 5× higher that found in hair of raccoons from Germany; however, Se concentration was similar. Thus, molar ratio of Se:THg was ~4× higher in the hair of raccoons from Germany than those from Luxembourg. Significant negative correlation was found between THg concentration and Se:THg molar ratio in both wildcats and raccoons.

scholarly journals Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon

2014 ◽  
Vol 44 (1) ◽  
pp. 99-105 ◽  
Author(s):  
Ronaldo de Almeida ◽  
José Vicente Elias Bernardi ◽  
Ronaldo Cavalcante Oliveira ◽  
Dario Pires de Carvalho ◽  
Angelo Gilberto Manzatto ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bottom Sediments ◽  
Total Mercury ◽  
Spatial Dynamics ◽  
Brazilian Amazon ◽  
Flood Pulse ◽  
Lake Area ◽  
Madeira River ◽  
Predominant Process ◽  
Main Region

The study was conducted in Puruzinho lake (Humaitá, AM) considering seasonal periods of rainy and dry in way to elucidate the flood pulse importance in the deposition, remobilization and distributions of mercury and organic matter in bottom sediments in the Madeira River Basin (Brazilian Amazon). Bottom sediments and soils samples were analyzed for total mercury and organic matter. Mercury concentrations obtained in bottom sediment were 32.20-146.40 ng g-1 and organic matter values were 3.5 - 18.0%. The main region for accumulation of mercury and organic matter was in the central and deepest lake area In the rainy season there was a greater distribution of Hg and organic matter, mainly controlled by means of income of the Madeira river water during flooding, while the predominant process in the dry season was the remobilization of total Hg due to the resuspension of bottom sediments.

Measuring total mercury due to small-scale gold mining activities to determine community vulnerability in Cihonje, Central Java, Indonesia

2015 ◽  
Vol 73 (2) ◽  
pp. 437-444 ◽  
Author(s):  
Mega M. Sari ◽  
Takanobu Inoue ◽  
Yoshitaka Matsumoto ◽  
Kuriko Yokota
Keyword(s):  
River Water ◽  
Mercury Concentration ◽  
Gold Mining ◽  
Total Mercury ◽  
Mining Area ◽  
Community Vulnerability ◽  
Mining Areas ◽  
The People ◽  
Hair Samples ◽  
Vulnerability Indicators

This research is comparative study of gold mining and non-gold mining areas, using four community vulnerability indicators. Vulnerability indicators are exposure degree, contamination rate, chronic, and acute toxicity. Each indicator used different samples, such as wastewater from gold mining process, river water from Tajum river, human hair samples, and health questionnaire. This research used cold vapor atomic absorption spectrometry to determine total mercury concentration. The result showed that concentration of total mercury was 2,420 times than the maximum content of mercury permitted in wastewater based on the Indonesian regulation. Moreover, the mercury concentration in river water reached 685 ng/l, exceeding the quality threshold standards of the World Health Organization (WHO). The mercury concentration in hair samples obtained from the people living in the research location was considered to identify the health quality level of the people or as a chronic toxicity indicator. The highest mercury concentration – i.e. 17 ng/mg, was found in the gold mining respondents. Therefore, based on the total mercury concentration in the four indicators, the community in the gold mining area were more vulnerable to mercury than communities in non-gold mining areas. It was concluded that the community in gold mining area was more vulnerable to mercury contamination than the community in non-gold mining area.

Total mercury and methylmercury in river dolphins (Cetacea: Iniidae: Inia spp.) in the Madeira River Basin, Western Amazon

2021 ◽  
Author(s):  
Melissa S. Barbosa ◽  
Dario P. Carvalho ◽  
Waleska Gravena ◽  
Ronaldo de Almeida ◽  
Marília H. Mussy ◽  
...  
Keyword(s):  
River Basin ◽  
Total Mercury ◽  
Madeira River ◽  
Madeira River Basin

Health effects of mercury ingested through consumption of seafood

1995 ◽  
Vol 32 (9-10) ◽  
pp. 41-47 ◽  
Author(s):  
L. Valentino ◽  
M. V. Torregrossa ◽  
L. J. Saliba
Keyword(s):  
Total Mercury ◽  
Sea Water ◽  
Mediterranean Area ◽  
Control Group ◽  
Sample Population ◽  
Security Level ◽  
Mercury Analysis ◽  
Starting Point ◽  
Hair Samples ◽  
Total Hg

It is known world-wide literature that seafood consumption is the main source of mercury intake in people not occupationally exposed. Several studies on the presence of mercury in sea water, sediment and fish and its effects on human health have been carried out in many countries in the Mediterranean area such as Greece, Italy and Jugoslavia. Few data have been published on Sicilian coastal population, consumers of high amounts of fish and on seawater status as the starting point of alimentary chains involving marine food. This study was carried out in July 1991 and July 1992 to determine total mercury and methylmercury levels in selected populations of the coast of Sicily: fishermen in a little island, Favignana, located west of Sicily, where the population can be considered at risk due to its high fish intake, and fishermen of a small fishing village (Porticello), near Palerno. As a control group, a sample population in a town located in the middle of Sicily (Valledolmo), where consumption of fish and seafood was quite inexistent and an urban population (inhabitants of Palermo) with variable quantities of seafood in diet were taken. Following the guidelines of WHO (1982) the subjects were interviewed by a dietary questionnaire. One hundred and twenty three hair samples, cut from the occipital area, were analysed for total mercury and methylmercury concentrations. Following the standard protocol for mercury analysis in hair, only those specimens exceeding 10 μg/g total Hg were analysed for methylmercury content. The results of study on 98 fishermen and their families with hair samples have shown that the dietetical weekly intake of seafood is related to the concentration values of total mercury and methylmercury that were found in the analysis. Only 19 subjects have been found with total mercury concentration values above the security level (&gt; 6 μg/g total Hg) and 8 have been analysed for methylmercury. From our data, it appears that in this Sicilian area, when there aren't industrial and natural sources of Hg, even if the population eats a large amount of locally caught fish, the concentration of Hg found in hair samples never reaches risk levels.

scholarly journals GLOBAL BECAUSE A SLAVEHOLDING ORDER: AN ANALYSIS OF THE URBAN DYNAMICS OF RIO DE JANEIRO BETWEEN 1790 AND 1815

Almanack ◽  
2020 ◽  
Author(s):  
Ynaê Lopes dos Santos
Keyword(s):  
Atlantic World ◽  
Rio De Janeiro ◽  
Social Dynamics ◽  
Global Dynamics ◽  
Urban Dynamics ◽  
Important Center ◽  
The One ◽  
Different Origins ◽  
Political Economic ◽  
The City

Abstract Rio de Janeiro stands out as one of the few cities in the Atlantic world that have managed to bring together characteristics so particular and at the same time revealing of the global dynamics that marked the last decades of the eighteenth century and the first fifty years of the next century. On the one hand, its political centrality became evident with its elevation to the thirst for colonial power (1763), its transformation into the Court of the Lusitanian Empire (1808) and its choice as the capital of the Brazilian Empire (1822), the portion “Versailles Tropical “Of Rio de Janeiro coexisted with a city that, in the words of an English traveler, more seemed the” heart of Africa “; with blacks and blacks of different origins, performing an innumerable number of activities that yielded to Rio de Janeiro the honorable title of the largest slave city in the Americas. More than harming foreign travelers unaccustomed to everyday slavery, or creating practices of “little Africa” in its territory, the strong presence of Africans and their descendants under the aegis of slavery reveals yet another facet of Rio de Janeiro: a locus of the world, in which identities, trajectories and senses of the city were in dispute. The purpose of this paper is precisely to understand the political, economic and social dynamics that characterized Rio de Janeiro as an important center of this Afro-Atlantic world

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