Interaction of pesticides with humic compounds and their metal complexes

Helal, A. A.; Imam, D. M.; Aly, H. F.

doi:10.1134/s1066362206040199

Cited by 22 publications

(12 citation statements)

References 27 publications

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“…In fact metals affect the pesticide degradation by catalyzing the photolysis/hydrolysis of pesticides or influencing the activity of microorganisms [ 18 ]. Similarly, complexation interactions between pesticides and metals may lead to a decrease in the rate of degradation of pesticides [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Distribution of Heavy Metals in the Soils Associated with the Commonly Used Pesticides in Cotton Fields

2016

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Agricultural soils contain both heavy metals and pesticides originating from various agricultural practices. It is quite important to study the relationships between these two classes of compounds. To accomplish this, 52 soil samples were collected from cotton fields and analyzed for their metal contents (Ni, Cu, Co, Pb, Cr, and Cd) and levels of most commonly used pesticides (imidacloprid, acetamiprid, and emamectin). FAAS was used for metal estimation and the pesticides were determined by HPLC equipped with UV detector. The results of the study revealed slightly enhanced levels of Ni and Cd in these samples while the rest of the metals were present within tolerable range. Acetamiprid residues in soil were strongly positively correlated with Cu and negatively correlated with Cr. Similarly, imidacloprid in soil was negatively correlated with Ni. Thus it was evidenced that Cu stabilizes acetamiprid while Cr and Ni facilitate the degradation of acetamiprid and imidacloprid in the soil.

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Section: Introductionmentioning

confidence: 99%

Distribution of Heavy Metals in the Soils Associated with the Commonly Used Pesticides in Cotton Fields

2016

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“…Weber and Weber et al suggested that ion exchange can be the principal adsorption mechanism of the protonated form of many s-triazines on SOM and clay minerals [53,54]. This finding was later confirmed by analytical methods [21,55].…”

Section: Mechanisms Of Tb Adsorption On Som and Clay Mineralsmentioning

confidence: 92%

Mechanisms of Tebuconazole Adsorption in Profiles of Mineral Soils

et al. 2021

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The study attempted to identify the soil components and the principal adsorption mechanisms that bind tebuconazole in mineral soils. The KF values of the Freundlich isotherm determined in 18 soils from six soil profiles in batch experiments after 96 h of shaking ranged from 1.11 to 16.85 μg1–1/n (mL)1/n g–1, and the exponent 1/n values from 0.74 to 1.04. The adsorption of tebuconazole was inversely correlated with the soil pH. Both neutral and protonated forms of this organic base were adsorbed mainly on the fraction of humins. The adsorption of the protonated form increased in the presence of hydrogen cations adsorbed in the soil sorption sites. Fourier transform infrared spectroscopy coupled with the molecular modeling studies and partial least squares regression analysis indicated that the tebuconazole molecule is bound in the organic matter through the formation of hydrogen bonds as well as hydrophobic and π–π interactions. Ion exchange was one of the adsorption mechanisms of the protonated form of this fungicide. The created mathematical model, assuming that both forms of tebuconazole are adsorbed on the organic matter and adsorption of the protonated form is affected by the potential acidity, described its adsorption in soils well.

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“…Metals may catalyze the photolysis/hydrolysis of pesticides or influence the microorganisms methabolomics [13]. On the contrary, complexation interactions between pesticides and metals may lead to a decrease in the rate of their degradation [14]. It was found that certain paramagnetic metal ions inhibit photodegradation of pesticides with humic acids [15], and the decreased imazapyr photolysis has been explained by coordinative binding of metal ions [16].…”

Section: A Study Of Chromium Interaction With N-donor Ligands Using Ementioning

confidence: 99%

A study of chromium interaction with N-donor ligands using electrospray-ionization mass spectrometry

Anđelković¹,

Branković²,

Kostić³

2018

Adv Techol

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A study of the interaction of chromium(III) with 2'2-bypiridine and two pesticides, atrazine and acetamiprid, as N-donor ligands was performed using electrospray-ionization mass spectrometry (ESI-MS) and ultraviolet/visible (UV/Vis) spectrophoto¬metry. Atrazine and acetamiprid, both widely used pesticides, were chosen for their approved toxic environmental effect, while 2,2'-bipyridine was selected for comparison, because of its powerful metal complexing ability. Chromium(III) is the toxic heavy metal ion that forms numerous stable complex compounds. The heterogeneity and complexity of natural matrices justify the usage of model systems such these, with the aim of evaluation of complex processes in the environment. The intensity of the interaction is correlated with the acid-base and electron-donor properties, geometric and steric characteristics, and the number and the positions of N-donor atoms in the investigated ligands. UV/Vis data describing chromium interaction with ligands is placed in correlation with ESI-MS data on the complexes. UV/Vis spectroscopy and ESI-MS quantification showed a large difference in the information they give in describing the interaction of chromium(III) with the ligands, the ESI-MS technique being superior. ESI-MS technique can be used for quantitative analysis of the system Cr(III)-ligand. ESI-MS ion current chromatograms of 20 µL loop injections of systems Cr(III)-ligand indicate a stabile peak and signal integrity.

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Interaction of pesticides with humic compounds and their metal complexes

Cited by 22 publications

References 27 publications

Distribution of Heavy Metals in the Soils Associated with the Commonly Used Pesticides in Cotton Fields

Distribution of Heavy Metals in the Soils Associated with the Commonly Used Pesticides in Cotton Fields

Mechanisms of Tebuconazole Adsorption in Profiles of Mineral Soils

A study of chromium interaction with N-donor ligands using electrospray-ionization mass spectrometry

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