Factors influencing the design of bioaccumulation factor and biota-sediment accumulation factor field studies

2003 ◽  
Vol 22 (2) ◽  
pp. 351-360 ◽  
Author(s):  
Lawrence P. Burkhard
2001 ◽  
Vol 35 (9) ◽  
pp. 1709-1715 ◽  
Author(s):  
Charles S. Wong ◽  
Paul D. Capel ◽  
Lisa H. Nowell

Toxics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 197
Author(s):  
Laura Marziali ◽  
Claudio Roscioli ◽  
Lucia Valsecchi

Riverine sediments are important sites of mercury methylation and benthic invertebrates may be indicators of Hg exposure to higher organisms. From 2014 to 2018, sediments and invertebrates were collected along a mercury gradient in the Toce River (Northern Italy) and analyzed for THg and MeHg. Concentrations in invertebrates, separated according to taxon and to Functional Feeding Group, ranged from 20 to 253 µg kg−1 dry weight (d.w.) for THg, increasing from grazers (Leuctra, Baetis, Serratella) to predators (Perla). MeHg ranged from 3 to 88 µg kg−1 d.w. in biota, representing 6–53% of THg, while in sediments it was mostly below LOD (0.7 µg kg−1), accounting for ≤3.8% of THg. The Biota-Sediment Accumulation Factor (BSAF, ranging 0.2–4.6) showed an inverse relation to exposure concentrations (THg in sediments, ranging 0.014–0.403 µg kg−1 d.w.) and to organic carbon. THg in invertebrates (up to 73 µg kg−1 wet weight), i.e., at the basal levels of the aquatic trophic chain, exceeded the European Environmental Quality Standard for biota (20 µg kg−1 w.w.), posing potential risks for top predators. Concentrations in adult insects were close to those in aquatic stages, proving active mercury transfer even to terrestrial food chains.


2018 ◽  
Vol 9 (1) ◽  
pp. 86-109
Author(s):  
Muhammad Fathullah Al Haq Muhamad Asni ◽  
Jasni Sulong

Fatwa is usually associated with a formal decision in respect of any Islamic law issued by a committee of religious-based regions or countries that have legal jurisdiction. Therefore, a fatwa gazetted in particular has the power legally enforceable against civilians in the territory. However the difference territory and jurisdiction of religion causing inconsistencies especially pronounced in response to the question of who gets disputes by fuqaha’ (khilafiyyah). This situation is clearly in Malaysia, where there are 14 State Mufti Department varying representing their respective states. Some fatwas issued by these states are found to be unparalleled to each other and this situation poses a conflict, especially in the administration of law. Although each state has a State Administration of Islamic Affairs which is almost uniform, have a provision referring to Islamic law (qawl final) and monitoring by the National Fatwa Committee on an issue of national fatwa, but some of the fatwa still in dispute resolution. The situation is the existence of a situation of unjust laws, there is no consistency in doing ijtihad, which denies the meaning of equality in the decision of Islamic law in the country. Thus, based on this, the study was conducted to identify the cause of the inconsistency of this fatwa, the factors influencing and measures and proposals to overcome. This is a qualitative research methodology in which data were collected through library research and field studies. Field studies conducted interviews with the mufti method, istinbat officials and senior academics. The study found that the Federal Government through  Jabatan Kemajuan Agama Islam Malaysia (JAKIM) has undertaken several initiatives to overcome this but the attitude of some members of the committee of states fatwa on the matter, which holds tight (rigid) to the Shafi'i and mastering knowledge in accepting differences of opinion (mura'ah al-khilaf ) restrain to reach this goal. This is because the Majlis Jawatankuasa Fatwa Kebangsaan (MJFK) was agreed as the medium of fatwa union between the states in the country and should be given priority at this stage of legal decisions ruling that the state can participate fully. Keywords: Fatwa, the difference (khilaf), Mufti, istinbat methods, Shafi'i madhhab Abstrak Fatwa adalah biasanya dikaitkan dengan keputusan rasmi berkenaan sesuatu hukum syarak yang dikeluarkan oleh sesuatu jawatankuasa agama yang berasaskan wilayah atau negara yang mempunyai bidangkuasa undang-undang. Oleh kerana itu, sesuatu fatwa khususnya yang diwartakan mempunyai kuasa perundangan yang boleh dikuatkuasakan ke atas orang awam di wilayah terbabit. Bagaimanapun perbezaan wilayah dan bidangkuasa agama menyebabkan berlakunya ketidakseragaman fatwa khususnya dalam menanggapi persoalan yang mendapat perselisihan fuqaha’ (khilafiyyah). Keadaan ini amat terserlah di Malaysia di mana terdapat 14 Jabatan Mufti Negeri yang berbeza-beza yang mewakili negeri masing-masing. Sebahagian fatwa yang dikeluarkan oleh negeri-negeri ini didapati tidak selari antara satu sama lain dan keadaan ini menimbulkan konflik terutamanya dalam pentadbiran undang-undang. Walaupun setiap negeri mempunyai Enakmen Hal Ehwal Pentadbiran Agama Islam yang hampir seragam, mempunyai peruntukan rujukan hukum syarak (qawl muktamad) yang sama dan pemantauan Muzakarah Jawatankuasa Fatwa Kebangsaan dalam sesuatu isu fatwa nasional, namun sebahagian fatwa tersebut masih lagi mendapat perselisihan keputusan. Keadaan ini mewujudan situasi hukum yang tidak adil, tiada keselarasan dalam melakukan ijtihad, yang menafikan maksud kesaksamaan dalam keputusan hukum syarak dalam negara ini. Justeru berdasarkan hal ini, kajian dijalankan untuk mengenal pasti punca ketidakselarasan fatwa ini, faktor-faktor yang mempengaruhi dan langkah serta cadangan untuk mengatasinya. Metodologi kajian ini bersifat kualitatif di mana data-data dikumpulkan melalui kajian kepustakaan dan kajian lapangan. Kajian lapangan dilakukan secara metod temubual dengan para mufti, pegawai istinbat dan ahli akademik. Hasil kajian mendapati bahawa Kerajaan Persekutuan melalui Jabatan Kemajuan Agama Islam Malaysia (JAKIM) telah melakukan beberapa inisiatif untuk mengatasi hal ini namun sikap sesetengah ahli jawatankuasa fatwa negeri yang ketat (rigid) kepada Mazhab Syafi'i dan penguasaan ilmu dalam menerima perbezaan pandangan (mura'ah al-khilaf) mengekang kepada capaian matlamat ini. Ini kerana Majlis Jawatankuasa Fatwa Kebangsaan (MJFK) telah dipersetujui sebagai medium penyatuan fatwa antara negeri-negeri di negara ini dan sepatutnya diutamakan keputusan hukum di peringkat ini supaya fatwa negeri dapat mengikuti dengan sepenuhnya. Kata kunci: Fatwa, perbezaan (khilaf), Mufti, kaedah istinbat, Mazhab Syafi'i.


2018 ◽  
Vol 12 (5) ◽  
pp. 17-22
Author(s):  
Mehdi Khoshnamvand ◽  
◽  
Almasieh Almasieh ◽  
Shahram Kaboodvandpour ◽  
◽  
...  

Background: Present study was conducted to measure the level of total mercury (tHg) in sediments, benthos and benthivorous fish (i.e., common carp) for determining Biota (Benthos)-Sediment Accumulation Factor (BSAF), as well as Biomagnification Factor (BMF) of tHg between two trophic levels of benthos and benthivorous fish caught from Sanandaj Gheshlagh Reservoir (SGR) in the west of Iran. Methods: Samples of sediments and benthos biomasses were collected from three sampling stations. Common carps were captured around the selected stations during July to December 2010. Results: Means accumulated tHg (±SE) in sediments, benthos masses and muscle tissue of common carp were 117.66±9.72, 94.3±5.02 and 233.21±20.67 ng g-1 dry weight, respectively. Means accumulated tHg in benthos masses and muscle tissue of the common carp during the studying months showed no significant differences (P>0.05), while it was significantly differed in sediment samples (P<0.05). Results showed that there were statistically significant differences between accumulated tHg between sediment and benthos mass samples collected from the study sites (P<0.05). Conclusion: During the study, all calculated BSAF measurements were less than one, indicating transmission of mercury from sediment to benthos was not considerable. However, mercury BMFs was higher than one, denoting mercury biomagnification occurred from the benthos trophic level to the higher trophic level (i.e., common carp) in study site. Hence, the health considerations have to be taken in to the account for consumption of fishery products of SGR.


2019 ◽  
pp. 10-13
Author(s):  
Miguel Vieira de Melo Netoc

Amazonian rainforest aquatic ecosystem is a very unique ecosystem in the Earth, which waters from the Amazon basin have distinct physicochemical and optical characteristics (black, clear and white). In this mini review paper, Amazon status of bioaccumulation and biomagnifications of Hg and MeHg is discussed. Emphasis has been given to understand the effect of BSAF on the aquatic trophic chain (plankton, macroinvertebrates). Keywords: Mercury; Methylmercury; Amazon


1996 ◽  
Vol 22 ◽  
pp. 160-166 ◽  
Author(s):  
Martin Kirkbride ◽  
Nick Spedding

Field studies at Mueller and Tasman Glaciers in New Zealand and in Iceland have revealed extensive ice-marginal moraine sequences fed by a series of debris bands containing characteristic rounded debris. We interpret these debris bands as meltwater deposits from relict conduits. The process of sediment accumulation described requires that debris undergoing basal or high-level ice transport is entrained by running water, becoming comminuted and rounded before being returned to high-level ice transport and eventual deposition in marginal moraines. Tins sequence of events suggests a link between glacier hydrology and ice-marginal sedimentation, possible mechanisms for which are explored. Pronounced moraines with rounded debris can be expected if (a) large quantity of debris is carried within the englacial drainage network; (b) there is a tendency for this debris to be abandoned within the ice; and (c) ice-flow trajectories and ablation ensure that this debris congregates at the ice surface. Streams which flow at high level within the ice can intercept and entrain englacial debris derived from rock fall. However, debris sources at Gigjökull and Steinholtsjökull in Iceland are restricted to the glacier bed, suggesting that, in certain cases, the presence of a basal overdeepening acts as a key factor controlling the accumulation of these moraines. Water pressure rises as channels encounter an overdeepening, forcing debris-laden streams to leave the bed and take an englacial route. That debris may pass from ice to water and back into ice before deposition has gone largely unrecognised in accounts of glacial process systems, yet it provides an explanation of how temperate alpine glaciers can include water-worked debris in their marginal depositional facies.


2021 ◽  
Author(s):  
Ahmed Helmy Hassan Abouelezz

One of the pollutants that affects the coastal environment of Qatar is the vast expanse of oil residue ‘tarmats’ deposited on its beaches. The current study is aimed at gauging the concentration levels of total mercury (THg) in tarmat contaminated sediments and test their presence in selected coastal species. Three biota classes (Gastropoda, Bivalvia, and Crustacea) have been found on the tarmat of Ras Rakan and Umm Tais islands. Layers of hard asphalt-like tarmats and sediments samples were collected from 34 sites, along the coast of Qatar. Moreover, the Biota Sediment Accumulation Factor (BSAF) was calculated for THg through sentinel species. The mean concentrations of THg is 0.089 ± 0.02 μg.g-1. Compared to earlier studies, a relatively higher concentration of THg (0.463 μg.g-1) had been observed.


2016 ◽  
Vol 6 (3) ◽  
pp. 18 ◽  
Author(s):  
Le Xuan Sinh

<p class="1Body">Bach Dang estuary (Hai Phong City) is one of the developed economic centers of Hai Phong city with abundance of natural resources. At the Bach Dang estuary, waste sources of mercury compounds discharge from the industrial sources, transportation sources, port, agricultural sources and living sources. Two forms of mercury: total mercury and methyl mercury in the water at the Bach Dang estuary are lower than the allowable limit. Bioaccumulation factor (BAF) of total mercury in hard clam <em>Meretrix lyrata</em> is 307 and that one of methyl mercury is 165,000.</p>


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