Quantification of 2,4-D and related chlorophenoxy herbicides by a magnetic particle-based ELISA

Lawruk, Timothy S.; Hottenstein, Charles; Fleeker, James R.; Hall, J. Christopher; Herzog, David P.; Rubio, Fernando

doi:10.1007/bf00194141

Cited by 32 publications

(21 citation statements)

References 8 publications

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“…Consequently, metolachlor detection in this part of the study was accomplished through enzyme-linked immunoabsorbent assay (ELISA). This technique for pesticide residue detection and quantification in water and substrates has been reviewed (Hutchinson et al, 1993;Lawruk et al, 1992Lawruk et al, , 1994Van Emon et al, 1987. The range of metolachlor detection for this study was 0.05 to 5.0 µg•liter -1 (Van Emon et al, 1987).…”

Section: Methodsmentioning

confidence: 99%

Adsorption, Mobility, and Filtration of Metolachlor in Container Media

Grey¹,

Wehtje²,

Hajek³

et al. 1996

jashs

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Adsorption, mobility, and filtration ability of organic media toward metolachlor were evaluated in a series of laboratory experiments. Experimental variables included media type, metolachlor concentration, and equilibration time. Adsorption isotherms were determined by applying the log form of the Freundlich equation. Mobility was evaluated using glass columns filled with media, which were then surface spiked with metolachlor and then leached daily for 10 consecutive days. Peat, pine bark, combinations of these two media and a mixture of pine bark and sand adsorbed >90% of the 14C metolachlor. Freundlich sorption coefficients were 10.9, 18.2, 13.4, 14.2, and 11.0 for pine bark, peat, 5 pine bark: 1 peat, 3 pine bark: 1 peat, and 5 pine bark: 1 sand, respectively. In a timed exposure experiment using bark, minimum metolachlor adsorption (57%) was at 90 seconds and maximum adsorption (82%) required at least 1440 minutes. In column leaching studies, data for all media indicate that metolachlor is relatively immobile through these substrates. An initial pulse of metolachlor (<1.0 μg·liter-1) was detected with each medium up to the third wetting event with a subsequent decline (>0.5 μg·liter-1 for each medium) in the metolachlor recovered. Filtration efficiency of commercially formulated metolachlor from water passed through different lengths of pine bark filled filters was 0%, 17%, 20%, 22%, 23%, and 29% for filters 4, 20, 12, 8, 16, and 24 cm in length, respectively. These results support the contention that such filtration would be effective provided the residence time of water within the filter was sufficient for adsorption of the contaminant by the media to occur.

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Section: Methodsmentioning

confidence: 99%

Adsorption, Mobility, and Filtration of Metolachlor in Container Media

Grey¹,

Wehtje²,

Hajek³

et al. 1996

jashs

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“…2,4‐D may badly affect the aquatic life in water bodies and cause chromosomal aberrations in human lymphocyte . Because of the described ecological and health problems owing to the use of 2,4‐D, the Environmental Protection Agency (EPA) referred it as a recalcitrant pollutant . In order to remove this kind of organic pollutant from water, several methods have been developed, including adsorption, photoinduced degradation, biodegradation, electrochemical degradation and advanced oxidation processes (AOP), using photocatalysts under UVA or solar light irradiation .…”

Section: Introductionmentioning

confidence: 99%

“…3,4 Because of the described ecological and health problems owing to the use of 2,4-D, the Environmental Protection Agency (EPA) referred it as a recalcitrant pollutant. 5 In order to remove this kind of organic pollutant from water, several methods have been developed, including adsorption, photoinduced degradation, biodegradation, electrochemical degradation and advanced oxidation processes (AOP), using photocatalysts under UVA or solar light irradiation. 6 -14 Several materials have been reported as photocatalysts for these kinds of reactions, including mixed oxides, hydrotalcites, etc.…”

Section: Introductionmentioning

confidence: 99%

Sol-gel synthesis of Tb-doped hydroxyapatite with high performance as photocatalyst for 2, 4 dichlorophenoxyacetic acid mineralization

Jiménez-Flores

Suárez-Quezada

Rojas-Trigos

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Tb3+doped hydroxyapatite was synthetized by the sol–gel technique, using amounts of the dopant source ranging from 2 to 12 wt%, with respect to the calcium former material. The solids were analyzed using several techniques in order to determine their structural, textural and optical properties. The photoactivity of the materials was tested in the degradation of 2,4‐dichlorophenoxyacetic acid, under UV irradiation. RESULTS The analysis of the samples by X‐ray diffraction, energy‐dispersive X‐ray spectroscopy and Fourier transform infrared spectroscopy indicates the formation of hydroxyapatite with calcium deficiency, with a stoichiometry close to the ideal in the sample doped with 10 wt% of terbium. The highest photoluminescence emission, production of •OH radicals under UV in the terephtalic acid reaction, as well as photocatalytic activity in the photodegradation of 2,4‐dichlorophenoxyacetic acid (2,4‐D) was found in the sample doped with 10 wt% of terbium, reaching almost total degradation and 95% of mineralization of the organic molecule, after 240 min irradiation. CONCLUSION Terbium doping during the synthesis of hydroxyapatite significantly improves its efficiency as photocatalyst. © 2017 Society of Chemical Industry

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“…These spectroscopic techniques are sensitive and accurate, but suffer from system complexity, long testing times, and the need for laboratory environments. Other widely used methods are molecularly interactive, such as enzyme-linked immunosorbent assays [20][21][22][23], capillary electro-phoresis [24,25], and surface plasmon resonance (SPR) [26,27]. Cartigny et al [28] used 31 P and 1 H nuclear magnetic resonance (NMR) to detect the presence of glyphosate in biological fluids to within 0.005 ∼ 1 g/L.…”

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confidence: 99%