Arsenic transfer and biotransformation in a fully characterized freshwater food web

Foust, Richard D.; Bauer, Anne-Marie; Costanza-Robinson, Molly S.; Blinn, Dean W.; Prince, Roger C.; Pickering, Ingrid J.; George, Graham N.

doi:10.1016/j.ccr.2015.03.005

Cited by 11 publications

(6 citation statements)

References 44 publications

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“…However, in largemouth bass, AsB and DMA both made up approximately 15% of extractable arsenic (Zheng & Hintelmann, 2004). This observed variability in the dominant organic species of arsenic among fish species may have a variety of underlying causes including differences in diet (Dutton & Fisher, 2011; Zhang et al, 2016), habitat selection (pelagic vs. littoral), sensitivity to various exposure pathways (Lu et al, 2023), gastrointestinal morphology (de Rosemond et al, 2008), and biotransformation capacity or pathways (Foust et al, 2016; Slejkovec, 2004; de Rosemond et al, 2008; Zhang et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Biodilution of Organic Species of Arsenic in Freshwater Food Webs

Lepage,

Lescord,

Lock

et al. 2023

Environmental Toxicology and Chemistry

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Arsenic can accumulate in freshwater biota, sometimes reaching potentially harmful levels. However, the toxicity of arsenic strongly depends on which arsenic species are present. Although organic species are considered less harmful than inorganic ones, they have not been extensively studied in freshwater environments and drivers of variation in arsenic speciation among sites and taxa remain unclear. We assessed concentrations of two organic arsenic species, arsenobetaine (AsB) and dimethylarsinic acid (DMA), in fish and invertebrates from three lakes near Sudbury, Ontario, Canada—a region with widespread mining impacts. Both AsB and DMA were detected in most samples (n = 212), varying across a wide range of concentrations (<0.001–30.144 and <0.006–5.262 mg/kg dry wt., respectively). The lake with the most severe mining impacts typically had the highest concentrations ([]) of AsB and DMA. In contrast, the percentage of total arsenic made up by AsB (%AsB) and DMA (%DMA) did not vary significantly between lakes. Arsenic speciation in fish muscle varied with fish size, selenium concentrations, and trophic elevation (inferred from nitrogen stable isotope ratios, δ15N), but relationships with dietary carbon source (inferred from carbon stable isotope ratios, δ13C) were more varied. Within all 3 lake food webs, [AsB] and [DMA] typically underwent biodilution, decreasing with trophic elevation (i.e., δ15N). Although the aforementioned factors explained some variation in arsenic speciation, there remains considerable unexplained variation. Further studies on arsenic speciation in freshwater biota should target a wider diversity of taxa to better understand drivers of variation in arsenic speciation. Additionally, work emphasizing the percentage of inorganic arsenic and other organic arsenic species is needed to improve environmental and human health risk assessments.

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Section: Resultsmentioning

confidence: 99%

Biodilution of Organic Species of Arsenic in Freshwater Food Webs

Lepage,

Lescord,

Lock

et al. 2023

Environmental Toxicology and Chemistry

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“…The As K-edge XANES spectrum of TMAO dihydrate was compared with other organic and inorganic arsenic species as shown in Figure 4. Although the As K-edge XANES spectrum of TMAO has been used for analyzing the presence of organic arsenic species in biological and environmental samples (Smith et al , 2005; Koch et al , 2007; George et al , 2009; Foust et al , 2016), spectral features have not been well discussed. The major feature in the As K-edge is the white line feature at corresponding to the dipole-allowed transition of an As 1s electron into unoccupied As 4p states.…”

Section: Resultsmentioning

confidence: 99%

Crystal structure and X-ray absorption spectroscopy of trimethylarsine oxide dihydrate, (CH₃)₃AsO⋅2H₂O

2020

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The crystal structure of trimethylarsine oxide dihydrate, (CH3)3AsO⋅2H2O, (TMAO dihydrate) has been solved using parallel tempering with the FOX software package and refined using synchrotron powder diffraction data obtained from beamline 08B1-1 at the Canadian Light Source. Rietveld refinement, performed with the software package GSASII, yielded orthorhombic lattice parameters of a = 13.3937(4) Å, b = 9.53025(30) Å, and c = 11.5951(3) Å (Z = 8, space group Pbca). The Rietveld refined structure was compared with density functional theory calculations performed with VASP and shows reasonable agreement. Arsenic K-edge X-ray absorption spectroscopy analysis also revealed additional information on the electronic structure of the arsenic atom within the TMAO dihydrate structure.

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“…Arsenic has been found to transfer through food webs from one trophic level to the next [ 17 , 18 ]. Total arsenic concentrations biodiminish with increasing trophic level in most aquatic food chains [ 19 ], as does the proportion of arsenic that is inorganic (iAs) [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Littoral sediment arsenic concentrations predict arsenic trophic transfer and human health risk in contaminated lakes

Hull,

Stiling,

Barajas

et al. 2023

PLoS ONE

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Lake sediments store metal contaminants from historic pesticide and herbicide use and mining operations. Historical regional smelter operations in the Puget Sound lowlands have resulted in arsenic concentrations exceeding 200 μg As g-1 in urban lake sediments. Prior research has elucidated how sediment oxygen demand, warmer sediment temperatures, and alternating stratification and convective mixing in shallow lakes results in higher concentrations of arsenic in aquatic organisms when compared to deeper, seasonally stratified lakes with similar levels of arsenic pollution in profundal sediments. In this study we examine the trophic pathways for arsenic transfer through the aquatic food web of urban lakes in the Puget Sound lowlands, measuring C and N isotopes–to determine resource usage and trophic level–and total and inorganic arsenic in primary producers and primary and secondary consumers. Our results show higher levels of arsenic in periphyton than in other primary producers, and higher concentrations in snails than zooplankton or insect macroinvertebrates. In shallow lakes arsenic concentrations in littoral sediment are similar to deep profundal sediments due to arsenic remobilization, mixing, and redeposition, resulting in direct arsenic exposure to littoral benthic organisms such as periphyton and snails. The influence of littoral sediment on determining arsenic trophic transfer is evidenced by our results which show significant correlations between total arsenic in littoral sediment and total arsenic in periphyton, phytoplankton, zooplankton, snails, and fish across multiple lakes. We also found a consistent relationship between percent inorganic arsenic and trophic level (determined by δ15N) in lakes with different depths and mixing regimes. Cumulatively, these results combine to provide a strong empirical relationship between littoral sediment arsenic levels and inorganic arsenic in edible species that can be used to screen lakes for potential human health risk using an easy, inexpensive sampling and analysis method.

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Arsenic transfer and biotransformation in a fully characterized freshwater food web

Cited by 11 publications

References 44 publications

Biodilution of Organic Species of Arsenic in Freshwater Food Webs

Biodilution of Organic Species of Arsenic in Freshwater Food Webs

Crystal structure and X-ray absorption spectroscopy of trimethylarsine oxide dihydrate, (CH₃)₃AsO⋅2H₂O

Littoral sediment arsenic concentrations predict arsenic trophic transfer and human health risk in contaminated lakes

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Arsenic transfer and biotransformation in a fully characterized freshwater food web

Cited by 11 publications

References 44 publications

Biodilution of Organic Species of Arsenic in Freshwater Food Webs

Biodilution of Organic Species of Arsenic in Freshwater Food Webs

Crystal structure and X-ray absorption spectroscopy of trimethylarsine oxide dihydrate, (CH3)3AsO⋅2H2O

Littoral sediment arsenic concentrations predict arsenic trophic transfer and human health risk in contaminated lakes

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Crystal structure and X-ray absorption spectroscopy of trimethylarsine oxide dihydrate, (CH₃)₃AsO⋅2H₂O