Heavy metals in sediments of the inner shelf of the Beaufort Sea, northern arctic Alaska

Sweeney, M. D.; Naidu, A. Sathy

doi:10.1016/0025-326x(88)90820-x

Cited by 24 publications

(9 citation statements)

References 3 publications

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“…Spearman's rank correlations for our long‐term data set for surface sediments confirm strong ( r > 0.8–0.9) or very strong ( r > 0.9–1.0) correlations for metals versus Al for 10 (Cr, Cu, Fe, Hg, Ni, Pb, Sb, Tl, V, Zn) of the 16 metals studied (Table S1). Similar correlations for sediment metals versus granulometry and Al in the coastal Beaufort Sea were reported in earlier publications (Sweeney and Naidu ; Crecelius et al ; Naidu et al , ; Trefry et al ; Brown et al ).…”

Section: Resultssupporting

confidence: 87%

“…Earlier studies of metals in sediments from the Alaskan Beaufort Sea at water depths of 18 to 35 m revealed a large range in metals concentrations that directly corresponded with data for granulometry, showing higher concentrations in silt‐ and clay‐rich samples (Sweeney and Naidu ). In shallow water (<5 m), higher concentrations for sediment Ba, Cr, Pb, and Zn were reported near offshore islands where drilling fluids and formation cuttings were discharged (Snyder‐Conn et al ).…”

Section: Introductionsupporting

confidence: 58%

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Effects of offshore oil exploration and development in the Alaskan Beaufort Sea: A three‐decade record for sediment metals

Trefry

Neff²

2018

Integr Envir Assess & Manag

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Impacts from oil exploration, development, and production in the Beaufort Sea, Alaska, USA are assessed using concentrations of metals in sediments collected during 2014 to 2015, combined with a large data set for 1985 to 2006. Concentrations of 7 (1980s) or 17 (1999-2015) metals in 423 surface sediments from 134 stations, plus 563 samples from 30 cores were highly variable, primarily as a function of sediment granulometry with naturally greater metals concentrations in fine-grained, Al-rich sediment. Metals versus Al correlation plots were used to normalize metals concentrations and identify values significantly above background. Barium, Cr, Cu, Hg, and Pb concentrations were above background, but variable, within 250 m of some offshore sites where drilling occurred between 1981 and 2001; these areas totaled <6 km of 11 000 km in the total lease area. Random and fixed sampling along the coastal Beaufort Sea from 1985 to 2015 yielded 40 positive anomalies for metals in surface sediments (∼0.8% of 5082 data points). About 85% of the anomalies were from developed areas. Half the anomalies were for the 5 metals found enhanced near drilling sites. No metals concentrations, except As, exceeded accepted sediment quality criteria. Interannual shifts in metals values for surface sediments at inner shelf sites were common and linked to storm-induced transitions in granulometry; however, metal-to-Al ratios were uniform during these shifts. Sediment cores generally recorded centuries of background values, except for As, Fe, and Mn. These 3 metals were naturally enriched in sediments from deeper water (>100 m) via diagenetic remobilization at sediment depths of 5 to 15 cm, upward diffusion, and precipitation in surface oxic layers. Minimal evidence for anthropogenic inputs of metals, except near some exploratory drilling sites, is consistent with extraction of most oil from land or barrier islands in the Alaskan Arctic and restricted offshore activity to date. Integr Environ Assess Manag 2018;00:000-000. © 2018 SETAC.

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Section: Resultssupporting

confidence: 87%

Section: Introductionsupporting

confidence: 58%

Effects of offshore oil exploration and development in the Alaskan Beaufort Sea: A three‐decade record for sediment metals

Trefry

Neff²

2018

Integr Envir Assess & Manag

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“…In the present study Cr, and Cu are lower than reported from the northeastern Chukchi Sea (Naidu and others 1997), Beaufort Sea inner shelf (Sweeney and Sathy-Naidu 1989), Laptev Sea (Holemann and others 1999) and Kongsfjorden (Lu and others 2012) (Table 2). Compared to the current study the base line data of terrestrial habitats (glacier ice core and lichens) of Svalbard (Singh and others 2012, 2013) showed lower concentrations of metals.…”

Section: Resultscontrasting

confidence: 42%

Elemental composition and bacterial occurrence in sediment samples on two sides of Brøggerhalvøya, Svalbard

et al. 2015

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The present study was conducted to determine the elemental concentration and bacterial presence in the ocean on the two sides of Brøggerhalvøya, a peninsula in Svalbard. Sediments from 25 different locations were collected and subjected to elemental analysis using inductively coupled plasma mass spectrometry (ICPMS). In total, 21 elements were analysed. The elements in their decreasing order of concentrations on the Kongsfjorden side of Brøggerhalvøya were Fe> Mn> Ba > V > Zn > Sr > Rb > Cr > Li > Ni > As > Pb > Cu > Co > Cs >Ag > Be > U> Bi >Tl > Cd while that for Forlandsendet side of Brøggerhalvøya they were Fe > Ba >Mn > V> Sr > Zn > Rb > Cr > Li > Ni > Pb > Cu > As > Co > Cs > Be > U> Tl > Bi > Cd. On the other hand, at a coastal outcrop, elements in their decreasing order of concentration were Fe > Mn > Cr > Sr > Ba > Rb > Cr > Zn > V > Rb > Ni > Li > Co > Cu > As > Pb > Cs > Be > Cd > Tl > U > Bi. AMS dates confirmed the age of outcrop sediment to be 12,496 to 42,500 BP. The crustal enrichment factor calculated for all the elements with reference to Fe values, demonstrates that the elements have derived from a crustal source. Total bacterial counts ranged from 3.30 × 105 to 3.02 × 106 per gm soil sediment. Culturable bacterial counts in these sediments were between 2.00 × 102 to 2.09 × 105 CFU's per gm. Overall comparison showed high Fe and Mn concentrations around Brøggerhalvøya, due to the presence of specific bacteria which play key roles in metal cycling and carry out biogeochemical transformations.

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“…The composition of residual bound Zn in the sediment was above 70% (Fig. 3), meaning that most of the Zn in the sediment was in a biologically unavailable form (Sweeney & Naidu 1989). However, this observation also might suggest that the labile fractions were mobilized, therefore not accumulating in the sediment.…”

Section: Resultsmentioning

confidence: 99%

The seasonal and spatial variations of labile copper, iron, manganese, lead and zinc sediment fractions in Lake Naivasha, Kenya

et al. 2007

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Lake Naivasha is a freshwater lake with no surface outlet, lying within a closed basin of the Kenyan Rift Valley. It is perceived to be a lake undergoing anthropogenic stresses. This study is intended to determine the speciation of some selected heavy metals in the sediments of Lake Naivasha, as an indicator of potential pollution of the lake. Sediment and water sampling of the lake was conducted in March and May 2003, during the dry and wet seasons, respectively. Analyses of the speciation of heavy metals in sediment samples (<63 µm faction) were performed on sediment samples collected from five sites within the lake. The study results obtained indicated that influent Malewa River was not a source of labile copper (Cu), lead (Pb) or zinc, despite the river having the highest percentage clay content during the wet season (86%). Copper was highly distributed in the residual sediment fraction (average of 90%). Among the labile sediment factions, the highest quantity of Cu was in the oxidizable phase (3.58 and 2.30 µg g -1 during the dry and wet season, respectively). Carbonate-bound Cu was sparingly distributed during both the dry and the wet seasons, ranging between 0.74 and 1.81 µg g -1 . Iron was highly distributed in the oxidizable sediment phase, exhibiting concentrations ranging between 2.0 and 6.0 (×10 3 ) µg g -1 . Relative to the other heavy metals, manganese was distributed in lower proportions in the residual sediment fraction. High concentrations of Pb were observed in the oxidizable phase from most of the sampling sites along the lake shore. Zinc was distributed largely in the oxidizable phase, being highest at sampling site SS, which was located near a municipal sewage input to the lake. The sediments collected at the sampling sites located in the deep portion of the lake exhibited the highest concentrations of labile heavy metals.

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Heavy metals in sediments of the inner shelf of the Beaufort Sea, northern arctic Alaska

Cited by 24 publications

References 3 publications

Effects of offshore oil exploration and development in the Alaskan Beaufort Sea: A three‐decade record for sediment metals

Effects of offshore oil exploration and development in the Alaskan Beaufort Sea: A three‐decade record for sediment metals

Elemental composition and bacterial occurrence in sediment samples on two sides of Brøggerhalvøya, Svalbard

The seasonal and spatial variations of labile copper, iron, manganese, lead and zinc sediment fractions in Lake Naivasha, Kenya

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