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Marie-laure Mahaut - One of the best experts on this subject based on the ideXlab platform.
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Effect of zinc Sacrificial Anode degradation on the defence system of the Pacific oyster, Crassostrea gigas: Chronic and acute exposures
Marine Pollution Bulletin, 2012Co-Authors: Elmina Mottin, Marie-laure Mahaut, Daniel Barillier, Christelle Caplat, Thomas Latire, Antoine Mottier, Katherine Costil, Jean-marc Lebel, Antoine SerpentiniAbstract:Two types of exposures were performed to assess the effects of zinc released from Sacrificial Anode degradation: a chronic exposure, in which oysters were exposed to 0.53 ± 0.04 mg Zn L−1 for 10 weeks, and an acute exposure, where oysters were exposed to 10.2 ± 1.2 mg Zn L−1 for 1 week. At the end of the acute exposure experiment, 81.8% mortality was recorded. In contrast, no mortality was detected after 10 weeks exposure. Moreover, all of the immune system biomarkers studied, except the number of circulating haemocytes, were stimulated by a moderate level of zinc and inhibited by a high level. Our exposure conditions did not induce SOD or MXR mRNA expression in gills and digestive gland. However, an increase of MT mRNA is observed in these tissues. The results indicate that oysters are sensitive to acute zinc toxicity but are only moderately affected by a mild zinc concentration.
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Impact of a Sacrificial Anode as Assessed by Zinc Accumulation in Different Organs of the Oyster Crassostrea gigas: Results from Long- and Short-Term Laboratory Tests
Archives of Environmental Contamination and Toxicology, 2012Co-Authors: Christelle Caplat, Daniel Barillier, Elmina Mottin, Jean-marc Lebel, Antoine Serpentini, Marie-laure MahautAbstract:Sacrificial Anodes made of zinc are currently used in marine environments to mitigate marine corrosion as part of CP systems of immerged metallic structures. The aim of this work was to study zinc bioconcentration in the oyster Crassostrea gigas by performing two in vivo tests during different time periods and at different zinc concentrations. The first test was conducted during a period of 10 weeks at a concentration of 0.53 ± 0.04 mg Zn L−1 to simulate long-term exposure, and a second test was conducted during a 168-hour period at a concentration of 10.2 ± 1.2 mg Zn L−1 to reproduce short-term exposure. In these experiments, the zinc source was an electrochemical device that included a Sacrificial Anode to mimic the in situ conditions. During the first 14 days of the long-term experiment, digestive glands of C oysters exhibited bioaccumulation of zinc that varied according to the oysters’ reproductive cycle. Both a bioconcentration factor (BCF) of ≤ 13,397 and a zinc accumulation percentage of +297% of zinc occurred in this organ after 10 weeks. The results obtained from the short-term test showed a lower BCF of 405 but a faster bioaccumulation of zinc (starting from the first day) in the same organ. No mortality was observed in long-term assay, but 81.8% of the oysters died at the end of the short-term assay. These results demonstrate the great capacity of C. gigas to accumulate zinc released from the Anode, especially when low concentrations are released, as in the case of Anode dissolution used as CP. This study confirmed the necessity to monitor this zinc-contamination source in marine environments in relation to the usual oyster consumption by humans (especially in France). No implication for human health of this zinc-contamination source was demonstrated until now, and this was not the purpose of this study; however, zinc remains one of the most abundant nutritionally essential elements in the human body that may affect the human immune system at high-level uptake.
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Assessment of Sacrificial Anode impact by aluminum accumulation in mussel Mytilus edulis: A large-scale laboratory test
Marine Pollution Bulletin, 2011Co-Authors: Andrea Mao, Marie-laure Mahaut, Samuel Pineau, Daniel Barillier, Christelle CaplatAbstract:Since the early 1960s, the application of aluminum alloy Sacrificial Anodes to mitigate marine corrosion has been well known. The aim of this work was to study aluminum bioconcentration in Mytilus edulis by an in vitro test performed in two tanks: the first containing non-contaminated water (NCW) and the second containing aluminum-contaminated water (CW) (530 μg L−1) released by Sacrificial Anode. The mussels were collected and examined over a period of 8 weeks. A comparison between the aluminum concentrations in the digestive glands of mussels from the CW and NCW tanks shows that the highest value (1700 mg/kg d.w.) was found in the CW mussels collected after 13 days. In NCW, the mean aluminum concentration in digestive glands during the test was 281 mg/kg d.w. The rapid concentration decrease in digestive glands is probably due to the inhibition of filtering activity due to valve closure at the high concentration as well as the induction of the detoxification response.
Christelle Caplat - One of the best experts on this subject based on the ideXlab platform.
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Effect of zinc Sacrificial Anode degradation on the defence system of the Pacific oyster, Crassostrea gigas: Chronic and acute exposures
Marine Pollution Bulletin, 2012Co-Authors: Elmina Mottin, Marie-laure Mahaut, Daniel Barillier, Christelle Caplat, Thomas Latire, Antoine Mottier, Katherine Costil, Jean-marc Lebel, Antoine SerpentiniAbstract:Two types of exposures were performed to assess the effects of zinc released from Sacrificial Anode degradation: a chronic exposure, in which oysters were exposed to 0.53 ± 0.04 mg Zn L−1 for 10 weeks, and an acute exposure, where oysters were exposed to 10.2 ± 1.2 mg Zn L−1 for 1 week. At the end of the acute exposure experiment, 81.8% mortality was recorded. In contrast, no mortality was detected after 10 weeks exposure. Moreover, all of the immune system biomarkers studied, except the number of circulating haemocytes, were stimulated by a moderate level of zinc and inhibited by a high level. Our exposure conditions did not induce SOD or MXR mRNA expression in gills and digestive gland. However, an increase of MT mRNA is observed in these tissues. The results indicate that oysters are sensitive to acute zinc toxicity but are only moderately affected by a mild zinc concentration.
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Impact of a Sacrificial Anode as Assessed by Zinc Accumulation in Different Organs of the Oyster Crassostrea gigas: Results from Long- and Short-Term Laboratory Tests
Archives of Environmental Contamination and Toxicology, 2012Co-Authors: Christelle Caplat, Daniel Barillier, Elmina Mottin, Jean-marc Lebel, Antoine Serpentini, Marie-laure MahautAbstract:Sacrificial Anodes made of zinc are currently used in marine environments to mitigate marine corrosion as part of CP systems of immerged metallic structures. The aim of this work was to study zinc bioconcentration in the oyster Crassostrea gigas by performing two in vivo tests during different time periods and at different zinc concentrations. The first test was conducted during a period of 10 weeks at a concentration of 0.53 ± 0.04 mg Zn L−1 to simulate long-term exposure, and a second test was conducted during a 168-hour period at a concentration of 10.2 ± 1.2 mg Zn L−1 to reproduce short-term exposure. In these experiments, the zinc source was an electrochemical device that included a Sacrificial Anode to mimic the in situ conditions. During the first 14 days of the long-term experiment, digestive glands of C oysters exhibited bioaccumulation of zinc that varied according to the oysters’ reproductive cycle. Both a bioconcentration factor (BCF) of ≤ 13,397 and a zinc accumulation percentage of +297% of zinc occurred in this organ after 10 weeks. The results obtained from the short-term test showed a lower BCF of 405 but a faster bioaccumulation of zinc (starting from the first day) in the same organ. No mortality was observed in long-term assay, but 81.8% of the oysters died at the end of the short-term assay. These results demonstrate the great capacity of C. gigas to accumulate zinc released from the Anode, especially when low concentrations are released, as in the case of Anode dissolution used as CP. This study confirmed the necessity to monitor this zinc-contamination source in marine environments in relation to the usual oyster consumption by humans (especially in France). No implication for human health of this zinc-contamination source was demonstrated until now, and this was not the purpose of this study; however, zinc remains one of the most abundant nutritionally essential elements in the human body that may affect the human immune system at high-level uptake.
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Assessment of Sacrificial Anode impact by aluminum accumulation in mussel Mytilus edulis: A large-scale laboratory test
Marine Pollution Bulletin, 2011Co-Authors: Andrea Mao, Marie-laure Mahaut, Samuel Pineau, Daniel Barillier, Christelle CaplatAbstract:Since the early 1960s, the application of aluminum alloy Sacrificial Anodes to mitigate marine corrosion has been well known. The aim of this work was to study aluminum bioconcentration in Mytilus edulis by an in vitro test performed in two tanks: the first containing non-contaminated water (NCW) and the second containing aluminum-contaminated water (CW) (530 μg L−1) released by Sacrificial Anode. The mussels were collected and examined over a period of 8 weeks. A comparison between the aluminum concentrations in the digestive glands of mussels from the CW and NCW tanks shows that the highest value (1700 mg/kg d.w.) was found in the CW mussels collected after 13 days. In NCW, the mean aluminum concentration in digestive glands during the test was 281 mg/kg d.w. The rapid concentration decrease in digestive glands is probably due to the inhibition of filtering activity due to valve closure at the high concentration as well as the induction of the detoxification response.
Yonggui Yan - One of the best experts on this subject based on the ideXlab platform.
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the performance of al zn in mg ti Sacrificial Anode in simulated deep water environment
Corrosion Science, 2013Co-Authors: Haijing Sun, Li Liu, Yonggui YanAbstract:Abstract The corrosion behaviour and working performance of Al–Zn–In–Mg–Ti Sacrificial Anode were studied in simulated deep water environment using potentiodynamic polarization, electrochemical impedance spectroscopy, self-discharge, gravimetric and imaging measurements. The results indicate that the corrosion of Al–Zn–In–Mg–Ti is accelerated which is due essentially to acceleration of the cathodic process, and the efficiency of Al–Zn–In–Mg–Ti Sacrificial Anode drops dramatically in deep water which is related to increased loss in weight and decreased discharge capacity. The corresponding cathodic protection design parameters of steel as calculate, show that at least 22% more Al–Zn–In–Mg–Ti Anode should be required in deep water environment.
Antoine Serpentini - One of the best experts on this subject based on the ideXlab platform.
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Effect of zinc Sacrificial Anode degradation on the defence system of the Pacific oyster, Crassostrea gigas: Chronic and acute exposures
Marine Pollution Bulletin, 2012Co-Authors: Elmina Mottin, Marie-laure Mahaut, Daniel Barillier, Christelle Caplat, Thomas Latire, Antoine Mottier, Katherine Costil, Jean-marc Lebel, Antoine SerpentiniAbstract:Two types of exposures were performed to assess the effects of zinc released from Sacrificial Anode degradation: a chronic exposure, in which oysters were exposed to 0.53 ± 0.04 mg Zn L−1 for 10 weeks, and an acute exposure, where oysters were exposed to 10.2 ± 1.2 mg Zn L−1 for 1 week. At the end of the acute exposure experiment, 81.8% mortality was recorded. In contrast, no mortality was detected after 10 weeks exposure. Moreover, all of the immune system biomarkers studied, except the number of circulating haemocytes, were stimulated by a moderate level of zinc and inhibited by a high level. Our exposure conditions did not induce SOD or MXR mRNA expression in gills and digestive gland. However, an increase of MT mRNA is observed in these tissues. The results indicate that oysters are sensitive to acute zinc toxicity but are only moderately affected by a mild zinc concentration.
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Impact of a Sacrificial Anode as Assessed by Zinc Accumulation in Different Organs of the Oyster Crassostrea gigas: Results from Long- and Short-Term Laboratory Tests
Archives of Environmental Contamination and Toxicology, 2012Co-Authors: Christelle Caplat, Daniel Barillier, Elmina Mottin, Jean-marc Lebel, Antoine Serpentini, Marie-laure MahautAbstract:Sacrificial Anodes made of zinc are currently used in marine environments to mitigate marine corrosion as part of CP systems of immerged metallic structures. The aim of this work was to study zinc bioconcentration in the oyster Crassostrea gigas by performing two in vivo tests during different time periods and at different zinc concentrations. The first test was conducted during a period of 10 weeks at a concentration of 0.53 ± 0.04 mg Zn L−1 to simulate long-term exposure, and a second test was conducted during a 168-hour period at a concentration of 10.2 ± 1.2 mg Zn L−1 to reproduce short-term exposure. In these experiments, the zinc source was an electrochemical device that included a Sacrificial Anode to mimic the in situ conditions. During the first 14 days of the long-term experiment, digestive glands of C oysters exhibited bioaccumulation of zinc that varied according to the oysters’ reproductive cycle. Both a bioconcentration factor (BCF) of ≤ 13,397 and a zinc accumulation percentage of +297% of zinc occurred in this organ after 10 weeks. The results obtained from the short-term test showed a lower BCF of 405 but a faster bioaccumulation of zinc (starting from the first day) in the same organ. No mortality was observed in long-term assay, but 81.8% of the oysters died at the end of the short-term assay. These results demonstrate the great capacity of C. gigas to accumulate zinc released from the Anode, especially when low concentrations are released, as in the case of Anode dissolution used as CP. This study confirmed the necessity to monitor this zinc-contamination source in marine environments in relation to the usual oyster consumption by humans (especially in France). No implication for human health of this zinc-contamination source was demonstrated until now, and this was not the purpose of this study; however, zinc remains one of the most abundant nutritionally essential elements in the human body that may affect the human immune system at high-level uptake.
Daniel Barillier - One of the best experts on this subject based on the ideXlab platform.
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Effect of zinc Sacrificial Anode degradation on the defence system of the Pacific oyster, Crassostrea gigas: Chronic and acute exposures
Marine Pollution Bulletin, 2012Co-Authors: Elmina Mottin, Marie-laure Mahaut, Daniel Barillier, Christelle Caplat, Thomas Latire, Antoine Mottier, Katherine Costil, Jean-marc Lebel, Antoine SerpentiniAbstract:Two types of exposures were performed to assess the effects of zinc released from Sacrificial Anode degradation: a chronic exposure, in which oysters were exposed to 0.53 ± 0.04 mg Zn L−1 for 10 weeks, and an acute exposure, where oysters were exposed to 10.2 ± 1.2 mg Zn L−1 for 1 week. At the end of the acute exposure experiment, 81.8% mortality was recorded. In contrast, no mortality was detected after 10 weeks exposure. Moreover, all of the immune system biomarkers studied, except the number of circulating haemocytes, were stimulated by a moderate level of zinc and inhibited by a high level. Our exposure conditions did not induce SOD or MXR mRNA expression in gills and digestive gland. However, an increase of MT mRNA is observed in these tissues. The results indicate that oysters are sensitive to acute zinc toxicity but are only moderately affected by a mild zinc concentration.
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Impact of a Sacrificial Anode as Assessed by Zinc Accumulation in Different Organs of the Oyster Crassostrea gigas: Results from Long- and Short-Term Laboratory Tests
Archives of Environmental Contamination and Toxicology, 2012Co-Authors: Christelle Caplat, Daniel Barillier, Elmina Mottin, Jean-marc Lebel, Antoine Serpentini, Marie-laure MahautAbstract:Sacrificial Anodes made of zinc are currently used in marine environments to mitigate marine corrosion as part of CP systems of immerged metallic structures. The aim of this work was to study zinc bioconcentration in the oyster Crassostrea gigas by performing two in vivo tests during different time periods and at different zinc concentrations. The first test was conducted during a period of 10 weeks at a concentration of 0.53 ± 0.04 mg Zn L−1 to simulate long-term exposure, and a second test was conducted during a 168-hour period at a concentration of 10.2 ± 1.2 mg Zn L−1 to reproduce short-term exposure. In these experiments, the zinc source was an electrochemical device that included a Sacrificial Anode to mimic the in situ conditions. During the first 14 days of the long-term experiment, digestive glands of C oysters exhibited bioaccumulation of zinc that varied according to the oysters’ reproductive cycle. Both a bioconcentration factor (BCF) of ≤ 13,397 and a zinc accumulation percentage of +297% of zinc occurred in this organ after 10 weeks. The results obtained from the short-term test showed a lower BCF of 405 but a faster bioaccumulation of zinc (starting from the first day) in the same organ. No mortality was observed in long-term assay, but 81.8% of the oysters died at the end of the short-term assay. These results demonstrate the great capacity of C. gigas to accumulate zinc released from the Anode, especially when low concentrations are released, as in the case of Anode dissolution used as CP. This study confirmed the necessity to monitor this zinc-contamination source in marine environments in relation to the usual oyster consumption by humans (especially in France). No implication for human health of this zinc-contamination source was demonstrated until now, and this was not the purpose of this study; however, zinc remains one of the most abundant nutritionally essential elements in the human body that may affect the human immune system at high-level uptake.
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Assessment of Sacrificial Anode impact by aluminum accumulation in mussel Mytilus edulis: A large-scale laboratory test
Marine Pollution Bulletin, 2011Co-Authors: Andrea Mao, Marie-laure Mahaut, Samuel Pineau, Daniel Barillier, Christelle CaplatAbstract:Since the early 1960s, the application of aluminum alloy Sacrificial Anodes to mitigate marine corrosion has been well known. The aim of this work was to study aluminum bioconcentration in Mytilus edulis by an in vitro test performed in two tanks: the first containing non-contaminated water (NCW) and the second containing aluminum-contaminated water (CW) (530 μg L−1) released by Sacrificial Anode. The mussels were collected and examined over a period of 8 weeks. A comparison between the aluminum concentrations in the digestive glands of mussels from the CW and NCW tanks shows that the highest value (1700 mg/kg d.w.) was found in the CW mussels collected after 13 days. In NCW, the mean aluminum concentration in digestive glands during the test was 281 mg/kg d.w. The rapid concentration decrease in digestive glands is probably due to the inhibition of filtering activity due to valve closure at the high concentration as well as the induction of the detoxification response.
