An assessment of the bioavailability of persistent organic pollutants from contaminated soil

Scott, Wanda C.; Dean, John R.

doi:10.1039/b500298b

Cited by 17 publications

(12 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… 30 Regardless of this significant knowledge gap, these nonplant commodity investigations have equivalent outcomes, specifically that solvent-based extraction methods overestimate the bioaccessible fraction. 31 , 32 The results of this investigation suggest the same occurs in plant commodities and once again reinforces the potential for overestimation of risk if using solvent-based methods. Using in vitro gastrointestinal tract simulators as part of a “body of evidence” during pesticide registration has clear advantages, and methods like this should be employed as a toolkit to help refine risk assessments for pesticides and other organic compounds.…”

Section: Discussionsupporting

confidence: 72%

Bioaccessibility of Difenoconazole in Rice Following Industry Standard Processing and Preparation Procedures

Craggs

Gibson

Whalley

et al. 2020

J. Agric. Food Chem.

View full text Add to dashboard Cite

For pesticide registration a post application assessment is made on the safety of any residue remaining in the edible portion of the treated crop. This assessment does not typically consider the bioaccessibility of pesticide residues. The effects of this on potential exposure to incurred difenoconazole residues passing through the human gastrointestinal tract were studied, including the impact of commodity processing. It has previously been demonstrated that solvent extraction methods have the potential to overestimate the bioaccessible fraction, so in vitro simulated gut systems may offer a better approach to determine residue bioaccessibility to refine the risk assessment process. The bioaccessibility of difenoconazole residues associated with processed rice samples was assessed using in vitro intestinal extraction and colonic fermentation methods. The mean bioaccessibility following intestinal digestion was 33.3% with a range from 13% to 70.6%. Quantification of the colonic bioaccessible fraction was not possible due to compound metabolism. Mechanical processing methods generally increased the residue bioaccessibility, while chemical methods resulted in a decrease. Both mechanical and chemical processing methods reduced the total difenoconazole residue level by ca. 50%.

show abstract

Section: Discussionsupporting

confidence: 72%

Bioaccessibility of Difenoconazole in Rice Following Industry Standard Processing and Preparation Procedures

Craggs

Gibson

Whalley

et al. 2020

J. Agric. Food Chem.

View full text Add to dashboard Cite

show abstract

“…Within this paper we focus on organic pollutants because this chemical class has received less attention than the toxic elements which have been reviewed by the regulatory agencies (Environment Agency, 2005;EPA, 2008) and there is uncertainty on which components of the test are influential. In soils the recoveries of lindane, endosulfan 1, endosulfan II endrin, DDE and DDD following intestinal extraction were between 5.5 and 13.5% (Scott and Dean, 2005). In 20 fish species bioaccessible DDT concentrations were between 5.48 and 17.6% (Wang et al, 2011a), while the average bioaccessibility of DDTs in a total dust sample was 24.5% (Wang et al, 2013b).…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 97%

‘Towards a unified approach for the determination of the bioaccessibility of organic pollutants’

Collins

Craggs

Garcia‐Alcega

et al. 2015

Environment International

View full text Add to dashboard Cite

“…This fraction is then available for internal exposure, i.e. entering the blood stream (Scott and Dean 2005). The bioavailability of aged and unaged pyrene to human was evaluated by measuring its desorption into an artificial stomach solution using the so-called physiologically based extraction test (PBET).…”

Section: Recovery and Distribution Of Pyrenementioning

confidence: 99%

Engineered Natural Geosorbents for In Situ Immobilization of DNAPLs and Heavy Metals

Weber¹,

Fair²,

Boyce³

2006

View full text Add to dashboard Cite

Extensive subsurface contamination by dense non-aqueous phase liquid (DNAPL) organic solvents and heavy metals is common place at many DOE facilities. Poor performances and excessive costs have made traditional technologies and approaches less than satisfactory for remediation of such sites. It is increasingly apparent that marginal improvements in conventional methods and approaches will not suffice for clean up of many contaminated DOE sites. Innovative approaches using new and/or existing technologies in more efficient and costeffective ways are thus urgently required.The irreversible in-situ immobilization and inactivation concept proposed in this study is an innovative and promising approach. The concept is predicated on the hypothesis that natural geosorbents, either as they exist or as appropriately modified, can be employed to bind and sequester chlorinated organic solvents, other hydrophobic organic compounds and heavy metals irreversibly, and thereby eliminate or greatly reduce their associated environmental risks. The technologies that can be brought to bear on the implementation of this concept are for the most part readily available, but in neither organized form nor optimized state. The research described here effectively addresses both deficiencies.Common components of dense non-aqueous-phase liquid (DNAPL) contaminants, including chlorinated organic solvents and polycyclic aromatic hydrocarbons (PAHs), and most heavy metals are known to be sorbed by various types of natural organic matter (NOM), mineral, and/or clay components of typical soils and sediments. It is also known that the specific physicochemical properties of these geosorbents significantly effect the relative strength and extent of their respective sorption reactions with different organic and inorganic contaminants.The more aromatic and chemically condensed (i.e. "hard carbon") forms of soil/sediment NOM have much higher and less reversible sorption capacities for organic chemicals and heavy metals than do the more aliphatic and highly amorphous (i.e., "soft carbon") forms (Weber et.al,1992).The sorption properties of soil NOM matrices are thus directly related to the degree of geochemical diagenesis they have undergone in the terrestrial and aquatic environment. It has recently demonstrated in our laboratories that the sorption energies and capacities of soil sediment NOM matrices for organic chemicals can be greatly increased by treatment with superheated water at accelerated temperatures and pressures to simulate and accelerate geochemical diagenesis of SOM. The sorption capacities of many other naturally occurring 2 materials (e.g., bark, peanut husks, peat, bentonite, zeolites, etc.) for heavy metals also have been shown to be improved by thermal treatment.There is mounting evidence that many sorbed hydrophobic organic contaminants and heavy metals become more strongly sequestrated and thus less mobile and bioavailable to environmental receptors after prolonged periods of contact with soils, i.e., the so-called "aging effect"....

show abstract

An assessment of the bioavailability of persistent organic pollutants from contaminated soil

Cited by 17 publications

References 22 publications

Bioaccessibility of Difenoconazole in Rice Following Industry Standard Processing and Preparation Procedures

Bioaccessibility of Difenoconazole in Rice Following Industry Standard Processing and Preparation Procedures

‘Towards a unified approach for the determination of the bioaccessibility of organic pollutants’

Engineered Natural Geosorbents for In Situ Immobilization of DNAPLs and Heavy Metals

Contact Info

Product

Resources

About