Objective: To determine heavy metal concentrations in holothurians (Holothuria arenicola, Holothuria pardalis, Holothuria verrucosa, Holothuria atra, Ohshimella ehrenbergii, Holothuria cinerascens, Stolus buccalis and...Objective: To determine heavy metal concentrations in holothurians (Holothuria arenicola, Holothuria pardalis, Holothuria verrucosa, Holothuria atra, Ohshimella ehrenbergii, Holothuria cinerascens, Stolus buccalis and Holothuria leucospilota), sediments and sea water samples from both Buleji and Sunehri coasts bordering Northern Arabian Sea during January to December 2014 and to assess the level of bioaccumulation using bioaccumulation factors. Methods: Fe, Mn, Zn, Cu, Cd and Pb levels were determined by Perkin Elmer AAnalyst 700 Atomic Absorption Spectrophotometer. Biota concentration factor (BCF) and biota sediment accumulation factor (BSAF) were also calculated. Results: The mean concentrations of heavy metals in body wall of sea cucumber ranged from 0.11 to 2.67, 0.43 to 8.93, 14 to 73, 0.76 to 7.12, 0.52 to 3.02 and 11 to 46 μg/g dry wright for Cd, Cu, Fe, Mn, Pb and Zn, respectively. The greatest biota-sediment bioaccumulation factor (BSAF) value for Zn (3.29) was observed in H. leucospilota at Buleji during pre-monsoon, indicating the species as microconcentrator. The BSAF values for Cd in sea cucumber ranged from 0.042 to 1.492. Conclusions: The results suggested that the studied sea cucumber species ranged from being microconcentrators to deconcentrators. The BSAF values of Cu, Fe, Mn and Pb were low, indicating the species as deconcentrators. Zn in all species from Sunehri coast is 'very bioaccumulative' (BCF > 5000) during all sampling periods. Cu, Fe, Mn and Pb can be considered 'bioaccumulative' (BCF < 5000).展开更多
Objective: To determine the levels of six heavy metals in the liver and edible tissues of different sizes of Drepane longimana collected at Karachi fish harbor of Pakistan during fisheries seasons in 2016. Methods: Th...Objective: To determine the levels of six heavy metals in the liver and edible tissues of different sizes of Drepane longimana collected at Karachi fish harbor of Pakistan during fisheries seasons in 2016. Methods: The concentrations of iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), lead (Pb) and cadmium (Cd) were carried out using Atomic Absorption Spectrophotometer (AAS, Aanalyst 700). Results: In muscle and liver tissues, Fe is detected in highest concentrations, followed by Zn, Cu, Mn, Cd and Pb. Concentrations of Cd and Pb of some individuals were not detected in the edible tissues. Large differences in these metal concentrations were observed between different tissues within each size of fish except Mn in 24–28 cm sizes. The liver of Drepane longimana accumulates significant higher levels of metals than those in the edible tissues. Conclusions: Based on the results of this study, the bioaccumulation of metals in the muscles of concertina fish did not exceed the permissible limits set for heavy metals by European Commission Regulation, Food and Agriculture Organization and Turkish Food Codex. It could be concluded that there is no risk in consumption of Concertina fish from Karachi fish harbor of Pakistan in 2016.展开更多
文摘Objective: To determine heavy metal concentrations in holothurians (Holothuria arenicola, Holothuria pardalis, Holothuria verrucosa, Holothuria atra, Ohshimella ehrenbergii, Holothuria cinerascens, Stolus buccalis and Holothuria leucospilota), sediments and sea water samples from both Buleji and Sunehri coasts bordering Northern Arabian Sea during January to December 2014 and to assess the level of bioaccumulation using bioaccumulation factors. Methods: Fe, Mn, Zn, Cu, Cd and Pb levels were determined by Perkin Elmer AAnalyst 700 Atomic Absorption Spectrophotometer. Biota concentration factor (BCF) and biota sediment accumulation factor (BSAF) were also calculated. Results: The mean concentrations of heavy metals in body wall of sea cucumber ranged from 0.11 to 2.67, 0.43 to 8.93, 14 to 73, 0.76 to 7.12, 0.52 to 3.02 and 11 to 46 μg/g dry wright for Cd, Cu, Fe, Mn, Pb and Zn, respectively. The greatest biota-sediment bioaccumulation factor (BSAF) value for Zn (3.29) was observed in H. leucospilota at Buleji during pre-monsoon, indicating the species as microconcentrator. The BSAF values for Cd in sea cucumber ranged from 0.042 to 1.492. Conclusions: The results suggested that the studied sea cucumber species ranged from being microconcentrators to deconcentrators. The BSAF values of Cu, Fe, Mn and Pb were low, indicating the species as deconcentrators. Zn in all species from Sunehri coast is 'very bioaccumulative' (BCF > 5000) during all sampling periods. Cu, Fe, Mn and Pb can be considered 'bioaccumulative' (BCF < 5000).
文摘Objective: To determine the levels of six heavy metals in the liver and edible tissues of different sizes of Drepane longimana collected at Karachi fish harbor of Pakistan during fisheries seasons in 2016. Methods: The concentrations of iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), lead (Pb) and cadmium (Cd) were carried out using Atomic Absorption Spectrophotometer (AAS, Aanalyst 700). Results: In muscle and liver tissues, Fe is detected in highest concentrations, followed by Zn, Cu, Mn, Cd and Pb. Concentrations of Cd and Pb of some individuals were not detected in the edible tissues. Large differences in these metal concentrations were observed between different tissues within each size of fish except Mn in 24–28 cm sizes. The liver of Drepane longimana accumulates significant higher levels of metals than those in the edible tissues. Conclusions: Based on the results of this study, the bioaccumulation of metals in the muscles of concertina fish did not exceed the permissible limits set for heavy metals by European Commission Regulation, Food and Agriculture Organization and Turkish Food Codex. It could be concluded that there is no risk in consumption of Concertina fish from Karachi fish harbor of Pakistan in 2016.
