scholarly journals Assessment of the Temporal and Spatial Variation of the Mercury Content of Lake Nokoué in Southern Benin Republic (West Africa)

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Julien G. Adounkpe ◽  
N. B. Nadia Azon ◽  
Hermione W. Dégila ◽  
Peace Hounkpe ◽  
Robertson Amoussou
Keyword(s):  
West Africa ◽  
Mercury Content ◽  
Mercury Contamination ◽  
Direct Mercury Analyzer ◽  
The Us ◽  
Us Epa ◽  
Mercury Analyzer ◽  
Anthropogenic Contribution ◽  
Fishery Products ◽  
Benin Republic

Anthropogenic input of mercury into watersheds is becoming increasingly noticeable and is the cause of fishery products contamination. This had led to the Convention of Minamata signed and ratified by the vast majority of the countries in the world. Lake Nokoué in Benin Republic, the most fishery products provider in West Africa, is subject to mercury pollution. The health threat to both the benthic and the consumers of the fishery products from this lake has to be anticipated by precisely determining the dynamics of mercury contamination of the waters and sediments of Lake Nokoué, taking into account the anthropogenic contribution. Water and sediment samples were collected on 23 sites twice a month for four sampling campaigns. Parameters such as pH, salinity, COD, and SS are evaluated in the water. The assessment of total mercury is conducted by cold vapor atomic absorption according to the US EPA 7473 method, using a direct mercury analyzer (DMA-80). On average, the mercury content in Lake Nokoué water is 0.43 ± 0.57 μg/kg. Its variation is linked not only to the seasonal variation but also to that of the suspended matter. South of the lake, the sediments are extremely polluted (5 ≤ Igeo) and present a risk of frequent effects for the benthic species present.

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 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.

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 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

scholarly journals Mislabelling and high mercury content hampers the efforts of market-based seafood initiatives in Peru

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Daniella Biffi ◽  
Andrea López-Mobilia ◽  
Shaleyla Kelez ◽  
Dean A. Williams ◽  
Matthew M. Chumchal ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Total Mercury ◽  
Mercury Content ◽  
Mercury Species ◽  
Protected Species ◽  
Upper Limit ◽  
Sustainable Seafood ◽  
The Us ◽  
High Mercury ◽  
Us Epa

AbstractPeru is experiencing a “gastronomic boom” that is increasing the demand for seafood. We investigated two implicit assumptions of two popular sustainable seafood consumer-based initiatives: (1) seafood is labelled correctly, and (2) the recommended species are healthy for consumers. We used DNA barcoding to determine the taxonomic identity of 449 seafood samples from markets and restaurants and analysed the concentration of total mercury (THg) in a sub-sample (271 samples) of these. We found that a third of seafood is mislabelled and that over a quarter of all samples had mercury levels above the upper limit recommended by the US EPA (300 ng/g ww). Additionally, 30% of samples were threatened and protected species. Mislabelling often occurred for economic reasons and the lack of unique common names. Mislabelled samples also had significantly higher mercury concentrations than correctly labelled samples. The “best choice” species compiled from two sustainable seafood guides had less mislabelling, and when identified correctly through DNA barcoding, had on average lower mercury than the other species. Nevertheless, some high mercury species are included in these lists. Mislabelling makes the efforts of seafood campaigns less effective as does the inclusion of threatened species and species high in mercury.

scholarly journals KANDUNGAN MERKURI PADA TUMBUHAN PAKU (Diplazium accedens Blume) DI DAERAH TAMBANG EMAS TATELU-TALAWAAN, KABUPATEN MINAHASA UTARA

2015 ◽  
Vol 15 (1) ◽  
pp. 59 ◽  
Author(s):  
Altini O. Kosegeran ◽  
Sendy Rondonuwu ◽  
Herny Simbala ◽  
Marhaenus Rumondor
Keyword(s):  
Plant Species ◽  
Gold Mining ◽  
Soil Analysis ◽  
Mercury Content ◽  
Gold Mine ◽  
Plant Analysis ◽  
Plant Samples ◽  
Direct Mercury Analyzer ◽  
Three Samples ◽  
Mercury Analyzer

ABSTRAK Tumbuhan paku Diplazium accedens Blume merupakan tumbuhan yang termasuk suku polypodiales yang tumbuh di hutan, di daerah pegunungan, rawa, dan di sekitar sungai. Daun paku ini sering dikomsumsi masyarakat sebagai sayur-sayuran. Penelitian ini bertujuan untuk mengetahui kandungan merkuri pada tumbuhan paku di daerah tambang emas Tatelu-Talawaan. Lokasi penelitian terletak di daerah Tambang Emas Talawaan-Tatelu, Kabupataen Minahasa Utara. Metode yang digunakan adalah mencakup analisis sampel tumbuhan paku dan analisis sampel tanah dengan menggunakan Alat Direct Mercury Analyzer. Tumbuhan paku dan tanah yang di ambil di 3 lokasi sebanyak 9 sampel tumbuhan paku dan 3 sampel tanah. Dari 9 sampel tumbuhan paku tidak ada yang mengandung merkuri, sedangkan tanah dari 3 lokasi pada bagian yang C yang mengandung merkuri sebesar 0,6 ppm. Kata kunci: Tanaman paku, merkuri, analisis tanah MERCURY CONTENT IN FERNS (Diplazium accedens Blume) IN THE GOLD MINE TATELU-TALAWAAN, NORTH MINAHASA DISTRICT ABSTRACT The fern Diplazium accedens Blume is a plant species belongs to Polypodiales family that grows in the forest, mountains, swamp, and near the river. This plant consumes as vegetable. This research aimed to measure the level of mercury in the fern grows near the Tatelu-Talawaan gold mining. The location for this research is the area of gold mining of Tatelu-Talawaan, North Minahasa. The methods used were plant analysis and soil analysis using Direct Mercury Analyzer. The plant and soil taken from three locations are consist of nine samples of plants and three samples of soil. None of the nine plant samples contained mercury and the soil from 3 locations contained 0.6 ppm of mercury. Keywords:The fern, mercury, soil analysis

Comparison of ICP-MS and direct mercury analyzer for the analysis of mercury in pharmaceuticals

Planta Medica ◽  
2015 ◽  
Vol 81 (16) ◽  
Author(s):  
Y Kho ◽  
M Kim ◽  
NY Park ◽  
H Park ◽  
JH Shin
Keyword(s):  
Direct Mercury Analyzer ◽  
Icp Ms ◽  
Mercury Analyzer

scholarly journals Assessment of the mercury contamination of landfilled and recovered foundry waste – a case study

2021 ◽  
Vol 19 (1) ◽  
pp. 462-470
Author(s):  
Marta Bożym ◽  
Beata Klojzy-Karczmarczyk
Keyword(s):  
Negative Impact ◽  
Mercury Content ◽  
Mercury Contamination ◽  
Reference Level ◽  
Organic Carbon Content ◽  
Foundry Sands ◽  
Industrial Sites ◽  
Different Types ◽  
Main Component

Abstract Environmental pollution by mercury is a local problem in Poland and concerns mainly industrial sites. Foundry waste are usually characterized by low mercury content compared to other heavy metals. Spent foundry sands with low content of Hg are the main component of foundry waste. However, Hg may be present in foundry dust, which may also be landfilled. Due to Hg toxicity, even a minimal content may have a negative impact on biota. This study focuses on assessing the mercury content of landfilled foundry waste (LFW), to assess its toxicity. Currently tested waste is recovered and reused as a road aggregate. The results were compared with the mercury content of local soils as the reference level. Waste samples were taken from foundry landfill. The mercury content, fractional composition, organic matter (OM) and total organic carbon content, pH and elementary composition of waste were analysed. It was found that the mercury content in LFW was very low, at the level of natural content in soils and did not pose a threat to the environment. The statistical analysis shows that mercury was not associated with OM of the waste, in contrast to soils, probably due to different types of OM in both materials.

Fundamental Characterisation of Dredged Marine Sediments from Kuala Perlis Jetty by XRF, XRD and FTIR

2012 ◽  
Vol 620 ◽  
pp. 469-473 ◽  
Author(s):  
Norhashimah Ramli ◽  
Mohammad Hafizuddin Haji Jumali ◽  
Wan Safizah Wan Salim
Keyword(s):  
Heavy Metals ◽  
Marine Sediments ◽  
Xrd Analysis ◽  
Raw Material ◽  
Ftir Analysis ◽  
Huge Amount ◽  
The Us ◽  
Dredged Marine Sediment ◽  
Primary Mineral ◽  
Us Epa

Dredging along Kuala Perlis Jetty results in huge amount of marine sediments which has thrown considerable challenge for disposal. This research was conducted to characterize dredged marine sediment which was collected at Kuala Perlis Jetty as potential raw material for brick production. Three different characterizations were performed namely XRF, XRD and FTIR. XRF analysis showed the presence of SiO2 and Al2O3 as major quantities. Low concentration of heavy metals namely As, Cr, Cu, Pb, Ni and Zn presence in the sediment comply the US EPA guideline for brick production. XRD analysis indicated the presence of quartz as primary mineral while kaolinite and illite also present as secondary and ternary phases. FTIR analysis identified various form of minerals presence in the samples which strongly supported XRD results.

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