Heavy metal distribution in sediment cores from Western Ross Sea (Antartica)

Ravanelli, M.; Tubertini, O.; Valcher, S.; Martinotti, W.

doi:10.1007/bf02406909

Cited by 15 publications

(10 citation statements)

References 17 publications

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“…This demonstrates that the acid leachable particulate iron should be resolvable using this method, and that the acid leachable particulate manganese fraction appears to be very small. 2010, Ravanelli et al 1997), but both the sediment and water column ratios are higher than crustal ratios (dashed lines, , suggesting that the particulate influences observed here are more biogenic than lithogenic. It is also a hybrid-type metal with low oceanic concentrations due to the low solubility of the oxidized ion in seawater.…”

Section: Figures For Chaptermentioning

confidence: 79%

“…The potential for terrestrial/continental sources can be inferred by comparing ratios of each metal with aluminum in the particulate phase to nearby sediment and to crustal values. Using data from a sediment core from the Ross Sea for iron and manganese (Ianni et al 2010) and from the Western Antarctic Peninsula for cobalt (Ravanelli et al 1997), Fig. 10 shows the relationships between the metal/Al ratios in the suspended particulate material, the crustal ratios , and that of the local sediment.…”

Section: Particulate Metal Distributions and Comparison Of Acid Leachmentioning

confidence: 99%

“…This may be slightly skewed for the cobalt sediment core Co/Al ratio as no data were available for a complete digestion processed with HF, though this influence is likely small as cobalt is not typically considered to be a silicate forming metal. The Co/Al sediment core ratio was taken from a sediment core study that processed their samples using a cold, weak acid leach (0.3 N HCl at room temperature for 2 h, Ravanelli et al 1997). …”

Section: Consideration Of Island Effects Terrestrial Input And/or Sementioning

confidence: 99%

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Influences on the oceanic biogeochemical cycling of the hybrid-type metals : cobalt, iron, and manganese

Noble¹

2012

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, in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the field of Chemical Oceanography Thesis AbstractTrace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micronutrients with oceanic distributions that are influenced by both biological and abiotic sources and sinks. Their open ocean concentrations range from picomolar to nanomolar, and their bioavailabilities can impact primary production. Understanding the biogeochemical cycling of these hybrid-type metals with an emphasis on cobalt was the focus of this thesis. This was accomplished by determining the dissolved distributions of these metals in oceanic regions that were characterized by different dominant biogeochemistries.A large subsurface plume of dissolved cobalt, iron, and manganese was found in the Eastern South Atlantic. The cause of this plume is a combination of reductive dissolution in coastal sediments, wind-driven upwelling, advection, biological uptake, and remineralization. Additional processes that are discussed as sources of metals to the regions studied during this thesis include isopycnal uplift within cold-core eddies (Hawaii), ice melt (McMurdo Sound, Antarctica), riverine input (Arctic Ocean), and winter mixing (McMurdo Sound). The biological influence on surface ocean distributions of cobalt was apparent by the observation of linear relationships between cobalt and phosphate in mid to low latitudes. The cobalt:phosphate ratios derived from these correlations changed over orders of magnitude, revealing dynamic variability in the utilization, demand, and sources of this micronutrient. Speciation studies suggest that there may be two classes of cobalt binding ligands, and that organic complexation plays an important role in preventing scavenging of cobalt in the ocean.These datasets provided a basis for comparing the biogeochemical cycles of cobalt, iron, and manganese in three oceanic regimes (Hawaii, South Atlantic, McMurdo Sound). The relative rates of scavenging for these metals show environmental variability: in the South Atlantic, cobalt, iron, and manganese were scavenged at very different rates, but in the Ross Sea, mixing and circulation over the shallow sea was fast, scavenging played a minor role, and the cycles of all three metals were coupled. Studying the distributions of these metals in biogeochemically distinct regions is a step toward a better understanding of their oceanic cycles.Thesis supervisor: Mak Saito Title: Associate Scientist 4 Acknowledgements I'd like to thank my advisor, Mak, for his support throughout my time in Woods Hole, for getting me to try my hand at jamming, for torturing me with his deadpan deliveries, for teaching me the paranoia that accompanies trace metal clean techniques, for introducing me to sukiyaki, for his understanding and flexibility, for somehow making me laugh whenever I think the world is ending, for having faith in me when I didn't, and lastly for the freedom I was ...

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Section: Figures For Chaptermentioning

confidence: 79%

Section: Particulate Metal Distributions and Comparison Of Acid Leachmentioning

confidence: 99%

Section: Consideration Of Island Effects Terrestrial Input And/or Sementioning

confidence: 99%

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Influences on the oceanic biogeochemical cycling of the hybrid-type metals : cobalt, iron, and manganese

Noble¹

2012

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“…Heavy metals accumulate more in sediments than in aquatic organisms and water [2], [14], [15] and as such sediments act as sinks and sources of supply of heavy metals to overlying water columns. In view of the fact that heavy metals such as Pb, and Zn are good markers of contamination from human activity detection of these metals in Shkodra Lake indicates contamination of the lake's water by human activities.…”

Section: Heavy Metals In Sedimentsmentioning

confidence: 99%

Heavy Metals in Water, Sediments and Macrophytes in the Shkodra Lake Heavy Metals in Water, Sediments and Macrophytes in the Shkodra Lake Heavy Metals in Water, Sediments and Macrophytes in the Shkodra Lake Heavy Metals in Water, Sediments and Macrophytes in the Shkodra Lake Heavy Metals in Water, Sediments and Macrophytes in the Shkodra Lake

2017

Budapest 2017 International Conferences LEBCSR-17, ALHSSS-17, BCES-17, AET-17, CBMPS-17 &Amp; SACCEE-17

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-Concentrations of some heavy metals in water, sediment and macrophytes of the Shkodra Lake were investigated in two periods (July -September) of 2012 in seven different sampling sites. The concentrations of the metals were determined using ICP. Cu, Fe, Ni, Mn, Pb and Zn were detected in all the sampling stations in water, sediments, and macrophytes. Average data indicated the Cu concentration was under 0.4 µg L-1 in water, 33mg kg-1 on sediments, and 14.9 mg kg-1 in macrophytes. The Fe values in water were low in September and very high in July. The highest values were observed in sediments (up to 15g kg-1), which were consistent with values found in water macrophytes. The water values for Mn were up to 0,058 mg L-1, in sediments up to 729 mg kg-1, while the average concentration in macrophytes was 436 mg kg-1. The highest values of Ni in water were observed in July (0.262 mg L-1), in sediments was 216 mg kg-1and the highest values of the three (Cu, Ni, Zn) elements observed in water macrophytes. The data obtained for Pb were mainly in sediments, with the average value at 23.5 mg kg-1. For all sampling stations the content of Zn in water were lower than 0.2 µg L-1. Its average value in sediment was 35.4 ± 23.35 mg kg-1. The average macrophyte values of Cu (14.9 ± 13.4 mg kg-1), Ni (68 ± 68 mg kg-1) and Zn (30 ± 14.3 mg kg-1) were comparable to the corresponding values found in sediments for all stations and periods.

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“…Biota ini dijadikan sebagai bahan pangan oleh masyarakat di Pesisir Tangerang dan kulit luarnya dapat dijual untuk dijadikan perhiasan. Logam berat yang terkandung dalam limbah akan mengendap di sedimen dan terakumulasi dalam tubuh P. placenta,sehingga akan berpengaruh terhadap kesehatan masyarakat yang mengkonsumsinya Pb, Cd dan Zn merupakan contoh logam berat yang sering dijadikan indikator terjadinya pencemaran logam berat di perairan yang berasal dari aktivitas manusia (Ravanelli et al,1997). Pencemaran perairan di Pesisir Kabupaten Tangerang dapat dianalisis dengan mengamati kualitas air, sedimen dan kandungan logam berat yang terdapat dalamtubuh simping.Informasi status pencemaran logam berat di Pesisir Kabupaten Tangerang masih minim.…”

Section: Pendahuluanunclassified

Status pencemaran dan kandungan logam berat pada simping (Placuna placenta) di Pesisir Kabupaten Tangerang

Simbolon¹,

Riani²,

Wardiatno³

2014

Depik

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Abstract. The objective of study was to analyze the status of water pollution and heavy metal content on water, sediment and scallop in Tangerang Coastal Waters. The Storet index method was used to determine the status of pollution. Sampling was conducted for three times at two months interval. The content of heavy metals in water, sediment and scallop analyzed descriptively based on the applicable regulations. The results showed that the status of Tangerang Coastal Water was classified as moderate and hight polluted. The content of Pb in scallop from Cituis Coastal has been exceeded the quality standards established by BPOMand WHO, so it is not sutible to consump.Keywords: pollution status; heavy metals; P.placenta; Tangerang Coastal Waters. Abstrak. Penelitian ini bertujuan untuk menganalisis status pencemaran perairan di Pesisir Kabupaten Tangerang dan kandungan logam berat pada air, sedimen dan simping di Pesisir Kabupaten Tangerang. Metode yang digunakan untuk mengetahui status pencemaran yaitu dengan metode indeks Storet. Pengambilan sampel dilakukan selama tiga kali dengan interval waktu dua bulan. Kandungan logam berat di air, sedimen dan simping dianalisis secara deskriptif berdasarkan peraturan yang berlaku. Hasil penelitian menunjukkan bahwa status perairan Pesisir Kabupaten Tangerang tergolong tercemar sedang hingga berat. Kandungan logam berat Pb pada simping di Perairan Cituis telah melampaui baku mutu yang ditetapkan baik menurut BPOM tahun 2009 maupun WHO, sehingga tidak baik untuk dikonsumsi.Kata kunci: Status pencemaran; Logam berat;P.placenta;Pesisir Kabupaten Tangerang

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Heavy metal distribution in sediment cores from Western Ross Sea (Antartica)

Cited by 15 publications

References 17 publications

Influences on the oceanic biogeochemical cycling of the hybrid-type metals : cobalt, iron, and manganese

Influences on the oceanic biogeochemical cycling of the hybrid-type metals : cobalt, iron, and manganese

Status pencemaran dan kandungan logam berat pada simping (Placuna placenta) di Pesisir Kabupaten Tangerang

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