Tefluthrin Sorption to Mineral Particles: Role of Particle Organic Coatings

Zhou, Jun; Rowland, Steve; Braven, J.; Mantoura, R.F.C.; Harland, B. J.

doi:10.1080/03067319508033130

Cited by 17 publications

(9 citation statements)

References 15 publications

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“…In the present study, we compare the sorption of two pyrethroids to suspended solids and a bed sediment at environmentally relevant concentrations employing a long equilibration time and very low sediment to water ratios (~1:1000), conditions more relevant to field conditions than those employed in many previous studies. For example, literature studies of pyrethroid sorption to minerals [1–3] and soils or sediments [4–12] have often employed initial aqueous concentrations well above solubility and short equilibration times (~1 day). Bondarenko et al (2006) [13] examined the distribution coefficient between sediment and water ( K d ) of pyrethroids at various aging times and concluded that equilibration times should be at least one month for pyrethroids in order to avoid underestimating the K d .…”

Section: Introductionmentioning

confidence: 99%

Pyrethroid sorption to Sacramento River suspended solids and bed sediments

Fojut

Young

2011

Environmental Toxicology and Chemistry

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Sorption of pyrethroid insecticides to solid materials will typically dominate the fate and transport of these hydrophobic compounds in aquatic environments. Batch reactor isotherm experiments were performed with bifenthrin and λ-cyhalothrin with suspended material and bed sediment collected from the Sacramento River, CA. These batch reactor experiments were performed with low spiking concentrations and a long equilibration time (28 d) to be more relevant to environmental conditions. Sorption to suspended material and bed sediment was compared to examine the role of differential sorption between these phases in the environmental transport of pyrethroids. The equilibrium sorption data were fit to the Freundlich isotherm model and fit with r 2 > 0.87 for all experiments. Freundlich exponents ranged from 0.72 ± 0.19 to 1.07 ± 0.050, indicating sorption nonlinearity for some of the experimental conditions and linearity for others over the concentration range tested. The Freundlich capacity factors were larger for the suspended solids than for the bed sediments and the suspended material had a higher specific surface area and higher organic carbon content compared to the bed sediment. Calculated organic carbonnormalized distribution coefficients were larger than those previously reported in the literature by approximately an order of magnitude and ranged from 10 6.16 to 10 6.68 at an equilibrium aqueous concentration of 0.1 µg/L. Higher than expected sorption of pyrethroids to the tested materials may be explained by sorption to black carbon and/or mineral surfaces.

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Section: Introductionmentioning

confidence: 99%

Pyrethroid sorption to Sacramento River suspended solids and bed sediments

Fojut

Young

2011

Environmental Toxicology and Chemistry

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“…Moreover, Mayer and Xing (2001) have reported that soil samples of low pH, especially from upper soil horizons, have most of their mineral surface covered by organic matter. In this respect, soil organic matter may exert significant impact on the sorption capacity of mineral particles (Zhou et al, 1995) and play a critical role in regulating the retention and transport of contaminants in soils. Even in surface soils containing as little as 1% organic matter, organic components coated on phyllosilicate and oxide minerals were found to dominate the surface chemistry (Bertsch and Seaman, 1999).…”

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confidence: 99%

Structural and Sorption Characteristics of Adsorbed Humic Acid on Clay Minerals

2005

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Clay-humic complexes are commonly distributed in natural environments. They play very important roles in regulating the transport and retention of hydrophobic organic contaminants in soils and sediments. This study examined the structural changes of humic acid (HA) after adsorption by clay minerals and determined phenanthrene sorption by clay-humic complexes. Solid- and liquid-state 13C nuclear magnetic resonance (NMR), for the first time, provided direct evidence for HA fractionation during adsorption on mineral surfaces, that is, aliphatic fractions were preferentially adsorbed by clay minerals while aromatic fractions were left in the solution. The ratio of UV absorbance of HA at 465 and 665 nm (E4 to E6 ratio), which is related to aromaticity, corroborated with the NMR results. For both montmorillonite and kaolinite, adsorbed HA fractions had higher sorption linearity (N) and affinity (K(oc)) than the source HA. The K(oc) of adsorbed HA for the clay-humic complexes could be up to several times higher than that of the source HA. This large increase may be contributed by the low polarity of the bound HA. Moreover, for each mineral, the N values of adsorbed HA increased with increasing HA loading. It is believed that HA may develop a more condensed structure on mineral surface at lower HA loading level due to the stronger interactions between HA and mineral surface as a result of close contacts.

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“…Among various nonliving objects in soil, clays and humic acids (HAs) are the most active constituents, and in spite of their drastically different chemical and physical identities, they contribute similarly to the chemical functionalities of soil. For example, both clays and HAs actively participate in detoxification of hazardous substances, preservation of vital minerals, and maintenance of ideal pH, fertility, and air/water ratios for plant growth. − Studies suggested that the activities of clay and HAs complement each other and an appropriate combination of the two is essential to obtain certain crucial functionalities of soil. − Nonetheless, rational blends of these two naturally abandoned materials have not been optimally applied with a view to creating advanced materials for futuristic applications. Here, we attempt to utilize the ubiquitous chemistry of HAs and clays to prepare multifunctional freestanding membranes with application possibilities in the areas like nanofluidic energy harvesting, water purification, and sensing of toxic chemicals.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of Soil Components into Multifunctional Freestanding Membranes

et al. 2019

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Multifunctional freestanding membranes are prepared by tuning the structure of ubiquitous soil components, viz. clay and humic acids. Cross-linking of exfoliated clay layers with purified humic acids not only conferred mechanical strength but also enhanced chemical robustness of the membranes. The percolated network of molecularly sized channels of the soil membranes exhibits characteristic nanofluidic phenomena. Electrical conductivity is induced to otherwise insulating soil membranes by heating in an inert atmosphere, without affecting their nanofluidic ionic conductivity. The soil membranes also provided a new platform to prepare and study mixed conducting materials. Strips of heated membranes are shown to exhibit excellent sensitivity toward NH 3 gas under atmospheric conditions.

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Tefluthrin Sorption to Mineral Particles: Role of Particle Organic Coatings

Cited by 17 publications

References 15 publications

Pyrethroid sorption to Sacramento River suspended solids and bed sediments

Pyrethroid sorption to Sacramento River suspended solids and bed sediments

Structural and Sorption Characteristics of Adsorbed Humic Acid on Clay Minerals

Reconstruction of Soil Components into Multifunctional Freestanding Membranes

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