Comparison of Earthworm Bioaccumulation between Readily Desorbable and Desorption-Resistant Naphthalene: Implications for Biouptake Routes

Qi, Yachao; Chen, Wei

doi:10.1021/es902899n

Cited by 30 publications

(11 citation statements)

References 37 publications

(56 reference statements)

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“…Higher percentages of HMN in the soils actually caused decreased uptake values, even though desorption rates increased. This suggests that, in contrast with naphthalene, which showed higher uptake by E. fetida when readily desorbable [42], an increase in HOC availability in the presence of NAPLs may not correspond to increased bioaccumulation, likely as a result of NAPL toxicity. Additionally, the soil properties (porosity, surface area) may have been changed by aging in the presence of the NAPL amendments.…”

Section: Discussionmentioning

confidence: 92%

Effects of aging and mixed nonaqueous‐phase liquid sources in soil systems on earthworm bioaccumulation, microbial degradation, sequestration, and aqueous desorption of pyrene

Petersen¹,

Tang²,

Weber³

2011

Enviro Toxic and Chemistry

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The effects of loading and aging pyrene in soils in the presence of four environmentally common nonaqueous-phase liquids (NAPLs) (hexadecane, 2,2,4,4,6,8,8-heptamethylnonane [HMN], toluene, and dimethyl phthalate [DMP]) on its subsequent desorption from those soils, earthworm accumulation, biodegradation, and extractability were tested by using two dissimilar soils. The presence of each of the four NAPLs increased fractions and rates of pyrene desorption, and hexadecane slowed the effects of aging on these same parameters. Loading with hexadecane and HMN caused earthworm accumulation of pyrene to decrease. These results contrast with generally observed faster desorption rates resulting from NAPL addition, suggesting that additional factors (e.g., association of pyrene with NAPL phases and NAPL toxicities to earthworms) may impact bioaccumulation. The presence of HMN and toluene increased pyrene biodegradation, whereas hexadecane and DMP had the opposite effects. These results correlate with changes in the extractability of pyrene from the soils. After aging and biodegradation, hexadecane and DMP substantially increased pyrene residues extractable by methanol and decreased nonextractable fractions, whereas HMN and toluene had the opposite effects.

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Section: Discussionmentioning

confidence: 92%

Effects of aging and mixed nonaqueous‐phase liquid sources in soil systems on earthworm bioaccumulation, microbial degradation, sequestration, and aqueous desorption of pyrene

Petersen¹,

Tang²,

Weber³

2011

Enviro Toxic and Chemistry

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“…It is assumed that only contaminants that can be released from soil/sediment are available to biological receptors. Qi and Chen (2010) suggested that for readily desorbable contaminants, the primary biouptake route is the porewater uptake. But for the desorption-resistant contaminants, the uptake from ingested soil particles can be also important.…”

Section: Quantification Of the Relationship Between Pfas Accumulationmentioning

confidence: 99%

Bioavailability of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in biosolids-amended soils to earthworms (Eisenia fetida)

Wen

Zhang

et al. 2015

Chemosphere

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h i g h l i g h t sBioavailability of PFOS and PFOA by earthworm in biosolids-amended soils was studied. The uptake and elimination kinetics fit a one-compartment first-order kinetic model. PFOS displayed higher k u , lower k e , and longer t ss than those of PFOA. The bioaccumulation factors and t ss decreased with soil concentrations increasing. Soil concentration and OM contents accounted for earthworm bioavailability. a r t i c l e i n f o b s t r a c tThe bioavailability of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in seven biosolids-amended soils without any additionally spiking to earthworms (Eisenia fetida) was studied. The uptake and elimination kinetics of PFOS and PFOA fit a one-compartment first-order kinetic model. PFOS displayed higher uptake and lower elimination rate coefficients, and longer time to reach steady-state (t ss ) than those of PFOA. The bioaccumulation factors (BAFs) of PFOS and PFOA ranged 1.54-4.12 and 0.52-1.34 g soil g worm À1, respectively. The BAFs and t ss decreased with increasing concentrations of PFOS and PFOA in soils. Stepwise multiple regression analysis was used to elucidate the bioavailability of PFOS and PFOA. The results showed that the total concentrations of PFOS and PFOA, and organic matter (OM) contents in soils explained 87.2% and 91.3% of the variation in bioavailable PFOS and PFOA, respectively. PFOS and PFOA concentrations exhibited positive influence and OM contents showed the negative influence on the accumulation of PFOS and PFOA in earthworms. Soil pH and clay contents played relatively unimportant role in PFOS and PFOA bioavailability.

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“…The extent of bioaccumulation of CBs in the earthworm was expressed using a biota-soil accumulation factor (BSAF) (Qi and Chen 2010), which was calculated by:…”

Section: Earthworm Accumulationmentioning

confidence: 99%

Chemical extraction to assess the bioavailability of chlorobenzenes in soil with different aging periods

et al. 2011

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Purpose Bioavailability is mainly influenced by aging and desorption of contaminants in soil. The purpose of this study was to investigate the desorption kinetics of chlorobenzenes (CBs) in soil and to investigate whether chemical extractions are suitable for the bioavailability assessment of CBs in soil. Materials and methods A soil spiked with CBs and aged for different periods was extracted with Tenax, hydroxypropyl-β-cyclodextrin (HPCD), and butanol to assess the bioavailability of CBs in soil, respectively. Earthworm (Eisenia foetida) accumulation was used as bioassay in parallel experiments to evaluate the chemical extractions. Results and discussionThe results showed that desorption of CBs from soil with consecutive Tenax extraction fitted into triphasic kinetics model. Different chemical methods extracted different amounts of CBs over different aging periods. For hexachlorobenzene (HCB), the extraction efficiency was in the order of butanol>Tenax-6h>HPCD extraction, while the order of butanol>HPCD>Tenax-6h extraction for pentachlorobenzene (PeCB). The bioaccumulation by earthworm decreased with increasing aging period and was significantly higher for HCB than for PeCB (p<0.05). Earthworm accumulated CBs correlated well with all the three chemical extracted CBs. However, HPCD extraction showed the converse extraction tendency with earthworm uptake of CBs.Conclusions Chemical extraction could be used to assess the bioavailability of contaminants in soil; however, they were method and compound specific. Tenax and butanol extractions were more reliable than HPCD extraction for bioavailability assessment of the tested CBs and the soil used since they showed the consistent extraction tendency with earthworm uptake of CBs.

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Comparison of Earthworm Bioaccumulation between Readily Desorbable and Desorption-Resistant Naphthalene: Implications for Biouptake Routes

Cited by 30 publications

References 37 publications

Effects of aging and mixed nonaqueous‐phase liquid sources in soil systems on earthworm bioaccumulation, microbial degradation, sequestration, and aqueous desorption of pyrene

Effects of aging and mixed nonaqueous‐phase liquid sources in soil systems on earthworm bioaccumulation, microbial degradation, sequestration, and aqueous desorption of pyrene

Bioavailability of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in biosolids-amended soils to earthworms (Eisenia fetida)

Chemical extraction to assess the bioavailability of chlorobenzenes in soil with different aging periods

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