scholarly journals Hg Levels in Marine Porifera of Montecristo and Giglio Islands (Tuscan Archipelago, Italy)

2020 ◽  
Vol 10 (12) ◽  
pp. 4342
Author(s):  
Camilla Roveta ◽  
Daniela Pica ◽  
Barbara Calcinai ◽  
Federico Girolametti ◽  
Cristina Truzzi ◽  
...  
Keyword(s):  
National Park ◽  
Total Mercury ◽  
Additional Data ◽  
Dry Weight ◽  
Mercury Content ◽  
Mediterranean Species ◽  
Direct Mercury Analyzer ◽  
Mercury Analyzer ◽  
Main Input ◽  
First Time

Porifera are filter-feeding organisms known to bioaccumulate different contaminants in their tissues. The presence of mercury (Hg) has been reported in different Mediterranean species, mainly collected in the southern coast of France. In the present study, mercury concentrations in the tissue of the sponges of Montecristo and Giglio, two islands of Tuscany Archipelago National Park (TANP), are presented for the first time. Analyses of total mercury content were performed by Direct Mercury Analyzer. Statistical differences have been reported in the Hg concentrations of species collected in both islands, but they do not appear related to the anthropic impacts of the islands. Among the collected species, a high intra- and inter-variability have been recorded, with Cliona viridis showing the lowest concentration (0.0167–0.033 mg·kg−1 dry weight), and Chondrosia reniformis and Sarcotragus spinosulus the highest (0.57 ± 0.15 and 0.64 ± 0.01 mg·kg−1 dry weight, respectively). The variability of Hg measured did not allow us to identify sponges as bioindicators of toxic elements. Anyway, these results improve knowledge on the ecosystem of the TANP, underlining the species-specificity of metal concentrations for Porifera, and providing additional data to address the main input of the Marine Strategy guidelines to protect coasts, seas and oceans.

scholarly journals Mercury content in the wool of domestic animals in Cherepovets

2018 ◽  
Vol 7 (3) ◽  
pp. 19-23
Author(s):  
Ekaterina Sergeevna Bachina ◽  
Olga Yurievna Rumiantseva ◽  
Elena Sergeevna Ivanova ◽  
Viktor Trofimovic Komov ◽  
Marina Andreevna Guseva ◽  
...  
Keyword(s):  
Mercury Concentration ◽  
Statistical Difference ◽  
Total Mercury ◽  
Domestic Animals ◽  
Mercury Content ◽  
Average Content ◽  
Comparison Analysis ◽  
Vologda Region ◽  
Total Mercury Concentration ◽  
Mercury Analyzer

Mercury (Hg) and its compounds are considered as one of the ten major dangerous groups of chemicals. The content of mercury in the coat was 136 cats and 113 dogs in the territory of the Vologda Region in Cherepovets. The total mercury concentration in the wool samples was measured on a mercury analyzer RA-915 +. The values of the mercury index in cats range from less than 0,001 mg / kg to 13,00 mg / kg, in dogs from less than 0,001 mg / kg to 1,858 mg / kg. Statistical difference in the content of mercury in wool between cats and dogs was revealed. The Hg content in cats is 3,5 times higher than the dogs have. Comparison analysis showed the concentration of mercury in the wool of cats and dogs have no statistically significant differences. The authors noted that cats had 4 times more mercury who ate fish. The average content of Hg in the wool of dogs is slightly different for those who ate fish.

scholarly journals Dredging Activities Carried Out in a Brazilian Estuary Affect Mercury Levels in Swimming Crabs

2020 ◽  
Vol 17 (12) ◽  
pp. 4396
Author(s):  
Paloma de Almeida Rodrigues ◽  
Rafaela Gomes Ferrari ◽  
Rachel Ann Hauser-Davis ◽  
Luciano Neves dos Santos ◽  
Carlos Adam Conte-Junior
Keyword(s):  
Total Mercury ◽  
Abiotic Factors ◽  
Human Consumption ◽  
Consumer Health ◽  
Swimming Crab ◽  
Health Issues ◽  
Guanabara Bay ◽  
Direct Mercury Analyzer ◽  
Mercury Analyzer

(1) Although suffers from intense pollution inputs, Guanabara Bay, the most socioeconomically and environmentally important estuary in Rio de Janeiro, Brazil, is still home to a diverse fauna, including several fish and crab species consumed by humans. The bay presents high sedimentation rates and sediment contamination, further aggravated by dredging processes carried out in recent years. In this context, this study aimed to verify the effect of the dredging process on total mercury (THg) concentrations at Guanabara Bay through swimming crab assessments sampled before (2016), during (2017), and after (2018) the dredging process, and mainly, if the detected concentrations can be harmful to consumer health; (2) Methods: Swimming crab samplings were carried out at the same time and sampling points in 2016, 2017 and 2018 and the total Hg was determined using a Direct Mercury Analyzer (DMA-80, Milestone, Bergamo, Italy); (3) Results: Increased Hg concentrations were observed during the dredging process, decreasing to lower values, close to the initial concentrations, at the end of the process. Some of the investigated abiotic factors favor Hg dynamics in the aquatic environment, while others were positively altered at some of the assessed sampling areas at the end of the dredging process; (4) Conclusions: Although crab Hg levels were below maximum permissible limits for human consumption, it is important to note that these animals are significantly consumed around Guanabara Bay, which may lead to public health issues in the long term.

scholarly journals Direct Mercury Analyzer (DMA) determination of mercury distribution in the sediments of lake Nokoué in Benin Republic-West Africa

2021 ◽  
Vol 15 (1) ◽  
pp. 306-316
Author(s):  
N.B. Nadia Azon ◽  
Peace Hounkpe ◽  
Julien G. Adounkpe ◽  
Hermione W. Degila ◽  
Martin P. Aina
Keyword(s):  
Mercury Content ◽  
Equal Mass ◽  
Mercury Contamination ◽  
Aquatic Life ◽  
Average Value ◽  
Direct Mercury Analyzer ◽  
Eastern Zone ◽  
The Us ◽  
Us Epa ◽  
Mercury Analyzer

Mercury pollution of water bodies constitutes a hazard to both the aquatic life and the populations consuming fishery products. To anticipate the probable eco-toxicological risks that may arise from the largest lake in southern Benin, the present work aims at assessing the mercury status of the sediments of Lake Nokoué, while identifying the areas exposed to anthropogenic mercury contamination. 45 sites were sampled according to a grid plan covering the entire ecosystem of the lake. Employing a Van Veen grab, surface sediments are collected at a depth from 0 to 5 cm in three catches at each site. The composite samples formed at equal mass on the three portions were frozen, lyophilized at - 40 °C, crushed, sieved and homogenized. Fraction less than 63 µm was collected for the mercury content determination by Direct Mercury Analyzer (DMA) operating by atomic absorption according to the US EPA 7473 method. The mercury concentration varies from 1.56 µg/kg to 164.88 µg/kg with an average value of 35.18 µg per kg of sediment. The south-eastern zone of the lake is more concentrated in mercury with a summation of the mercury content of 530.3 µg/kg of sediment. However, the lake has moderate contamination overall (1 ≤ FC ≤ 3). Keywords: Pollution, contamination, mercury, sediment, Lake Nokoué.

scholarly journals Total mercury and methylmercury (MeHg) in braised and crude Boletus edulis carpophores during various developmental stages

2021 ◽  
Author(s):  
Jerzy Falandysz ◽  
Martyna Saba ◽  
Małgorzata Rutkowska ◽  
Piotr Konieczka
Keyword(s):  
Developmental Stage ◽  
Total Mercury ◽  
Developmental Stages ◽  
Dry Weight ◽  
The Other ◽  
Large White ◽  
Boletus Edulis ◽  
Single Meal ◽  
Wet Weight ◽  
First Time

AbstractWe collected and processed Boletus edulis (King Bolete) carpophores grouped in four batches based on their developmental stage (button stage, young—white, large—white, and large—yellow). The study aimed, for the first time, to examine the B. edulis content and effect of braising and to estimate the intake of total mercury (THg) and methylmercury (MeHg) from a single meal based on whole (wet) weight (ww) and dry weight (dw). In braised carpophores, THg concentrations ranged from 0.2668 ± 0.0090 to 0.5434 ± 0.0071 mg kg−1 ww at different developmental stages, whereas crude products concentrations ranged from 0.1880 ± 0.0247 to 0.2929 ± 0.0030 mg kg−1 ww. The button stage crude carpophores were more highly contaminated with THg than at later stages of maturity, but MeHg levels were lower (p < 0.0001). On the other hand, braised button stage carpophores showed more MeHg than at later maturity stages. MeHg contributed at 1.9 ± 0.7% in THg in crude mushrooms and at 1.4 ± 0.3% in braised meals. The effect of braising was to increase the average THg and MeHg contents in fresh mushroom meals by 52 ± 31% and 53 ± 122% respectively, but a reduction of 40 ±14% and 40 ± 49% respectively was seen on a dw basis. The potential intakes of THg and MeHg from braised meals of B. edulis studied were small and considered safe. Graphical abstract

scholarly journals Total mercury in rice plant (Oryza sativa) collected from Sekinchan, Selangor, Malaysia and associated health risks

Food Research ◽  
2021 ◽  
Vol 5 (S1) ◽  
pp. 132-136
Author(s):  
A.C. Soong ◽  
N.M. Isa ◽  
A.Z. Aris ◽  
H. Haris ◽  
L.J. Looi
Keyword(s):  
Oryza Sativa ◽  
Rice Plant ◽  
Total Mercury ◽  
Mercury Contamination ◽  
Potential Health ◽  
Plant Parts ◽  
Food Regulation ◽  
Direct Mercury Analyzer ◽  
Mercury Analyzer ◽  
The Mean

Consumption of mercury-contaminated rice could pose a potential health risk to humans. In this study, total mercury (THg) concentrations in various parts (roots, stems, leaves, and grains) of rice plant (Oryza sativa) collected from Sekinchan, Selangor, Malaysia were analysed for risk assessment. The THg concentrations in collected samples were analysed by Direct Mercury Analyzer (DMA-80). The mean concentrations found in plant parts were as follows: root, 47.01±0.42 µg/kg; stem, 6.43±1.77 µg/kg; leaf, 26.25±4.71 µg/kg; grain, 2.64±0.42 µg/kg. THg distribution in rice plants was roots > leaves > stems and grains. The mean THg concentration in grain (2.64±0.42 µg/kg) was below the maximum permitted proportion stipulated by Malaysian Food Regulation 1985 (50.0 µg/ kg). The estimated weekly intake (EWI) of THg through rice was 0.07±0.01 µg/kg bw/ week for 60 kg adult, below the provisional tolerable weekly intakes (PTWI) as suggested by JECFA indicating unlikely to cause impairment of public health due to consumption of rice planted in this region. However, periodical monitoring of mercury pollution in Selangor area is crucial because mercury contamination in crops could jeopardize food safety and security

Simultaneous combustion preparation for mercury isotope analysis and detection of total mercury using a direct mercury analyzer

2021 ◽  
Vol 1154 ◽  
pp. 338327
Author(s):  
Maxime Enrico ◽  
Prentiss Balcom ◽  
David T. Johnston ◽  
Julien Foriel ◽  
Elsie M. Sunderland
Keyword(s):  
Total Mercury ◽  
Isotope Analysis ◽  
Mercury Isotope ◽  
Direct Mercury Analyzer ◽  
Mercury Analyzer

Determination of Total Mercury in Sushi Samples Employing Direct Mercury Analyzer

2015 ◽  
Vol 8 (9) ◽  
pp. 2301-2307 ◽  
Author(s):  
Marcelo A. Morgano ◽  
Raquel F. Milani ◽  
Adriana A. M. Perrone
Keyword(s):  
Total Mercury ◽  
Direct Mercury Analyzer ◽  
Mercury Analyzer

scholarly journals Mercury content of sarotherodon melanotheron and chrysischthys nigrodigitatus of Lake Nokoue and Porto Novo lagoon in Benin

2020 ◽  
Vol 14 (6) ◽  
pp. 2322-2332
Author(s):  
Hermione W. Degila ◽  
Nadia B.N. Azon ◽  
Julien G. Adounkpe ◽  
Antoine Chikou ◽  
Martin P. Aïna
Keyword(s):  
Mercury Content ◽  
Living Environment ◽  
Mercury Contamination ◽  
Sample Collection ◽  
Direct Mercury Analyzer ◽  
Productive Water ◽  
Monthly Sample ◽  
Mercury Analyzer ◽  
Sarotherodon Melanotheron ◽  
Porto Novo

Ratification of Minamata Convention by Bénin requires identification of contaminated sites and preservation of health. In this context, the Ministry of Living Environment and Sustainable Development supported the study by making its mercury analyzer DMA80 available. The study aims to identify the level of mercury contamination in two highly valued fish species caught in one of the most productive water bodies where mercury is reported. So, three monthly sample collection campaigns were carried out from April to juin 2018 at nine (09) sites. The back flesh of sarotherodon melanotheron and chrysischthys nigrodigitatus of lake Nokoue and Porto Novo lagoon was analyzed by direct mercury analyzer (DMA 80). it Its operating principle is atomic absorption after thermal decomposition coupled with a gold sensor. The average mercury contents are 20.8 ± 15.5 μg / kg and 6.5 ± 3.8 wet μg / kg weight respectively for Chrysichthys nigrodigitatus and Sarotherodon melanotheron. The highest values obtained at the Porto-Novo bridge for both species remain well below the standard (0.5 mg / kg wet weight). With consumption habits of fish in Benin, the weekly exposure doses seem to be much lower than WHO recommendation. However, deepened studies are needed.Keywords: Fish, mercury, spatial distribution, NoKoué Lake, Porto-Novo Lagoon.

The Pollution of Minamata Bay by Mercury

1992 ◽  
Vol 25 (11) ◽  
pp. 133-140 ◽  
Author(s):  
M. Fujiki ◽  
S. Tajima
Keyword(s):  
Waste Water ◽  
Mercury Concentration ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Dry Weight ◽  
Mercury Content ◽  
Mercury Oxide ◽  
Wet Weight ◽  
Minamata Bay ◽  
Very High

Minamata Disease, methylmercury poisoning, was recognized late in 1953 among the inhabitants living around Minamata Bay. In a chemical factory situated near Minamata Bay, acetaldehyde had been synthesized by the hydration of acetylene till 1968; in the reaction mercury oxide dissolved in sulfuric acid had been used as a catalyst. Inorganic mercury in waste water from the acetaldehyde plant had been discharged into the bay and it had accumulated into bottom sediment. It was proved that a part of inorganic mercury used as the catalyst had changed into methylmercury by a sidereaction in the plant and waste water containing methylmercury from the plant had discharged into the bay and methylmercury had accumulated into the fishes. The mercury concentrations in the muds were very high: in 1963, 29~713 ppm (dry weight); in 1969, 19~908 ppm (dry weight); in 1970, 8~253 ppm (dry weight) and in 1971, 14~586 ppm (dry weight). Since 1977, dredging work had been carried out to remove mercury-contaminated mud and all of the work had finished at March 1990. The concentration of mercury in fishes from the bay was very high in 1959: shellfishes 108~178 ppm (dry weight) and fish 15 ppm (wet weight). Mercury concentration in fishes has decreased markedly since 1966. Total mercury concentration in fishes (87 species) were 0.01~1.74 ppm (wet weight) and fishes containing over 0.4 ppm of total mercury were 16 species in 1989. The hair of patients contained a high concentration of mercury, the highest being 705 ppm. In 1968, the average mercury concentration in patients was 10.6 ppm, for fishermen, the average was 9.2 ppm, and for general inhabitants, the average was 8.1 ppm. In 1982, the average methylmercury concentration in fishermen was 6.15 ppm and for general inhabitants, the averge was 3.78 ppm. Thus, the mercury content in hair decreased gradually with time. After treatment of mercury in waste water was initiated, the mercury content in fishes from Minamta Bay was gradually reduced. It is necessary to supervise strictly to avoid mercury pollution of the environment.

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