+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Sorption interactions between imazaquin and a humic acid extracted from a typical Brazilian oxisol

, : Sorption interactions between imazaquin and a humic acid extracted from a typical Brazilian oxisol. Journal of Environmental Quality 31(5): 1665-1670

Soil sorption of most hydrophobic organic compounds (e.g., nonpolar pesticides) is directly related to soil organic matter (SOM) content. Humic substances are the major SOM components, containing carboxylic, phenolic, amine, quinone, and other functional groups, and specific structural configurations. In this paper, sorption interactions between imazaquin (2-[4,5-dydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3- quinoline-carboxylic acid) herbicide (IM) and a humic acid (HA) extracted from a typical Brazilian Oxisol were studied with electron paramagnetic resonance (EPR) and Fourier-transform infrared (FTIR) spectroscopic techniques. A polarographic technique was used to quantify sorption. The IM amount sorbed on the HA was much higher than that on the whole soil within the pH range studied, emphasizing the prominent role played by SOM on IM sorption. Moreover, IM sorption increased as the soil-solution pH decreased. This enhancement in sorption was attributed to the hydrophobic affinity of the herbicide by the HA and to the electrostatic interaction between the protonated quinoline group of IM and the negative sites of the HA. Hydrophobic regions in the HA's interior at low pH (<5.0) were recently demonstrated by an EPR detectable spin-label molecule. The FTIR and EPR spectroscopy and polarography data indicated weak interaction between IM and the soil and its HA, involving hydrogen bonding, proton transfer, and cation exchange (at low pH), and mainly hydrophobic interactions. However, no strong reaction mechanism, such as charge transfer, was involved. In addition, this research suggested that soil amendment with organic material might increase magnitude of IM sorption, consequently avoiding leaching and carryover problems usually found for mobile and persistent herbicides such as imazaquin. Reprinted by permission of the publisher.


PMID: 12371184

Other references

Chiao, J.; Vandervelde, A.; Craft, S.; Jenkins, S.G., 1995: Clinical correlation of antifungal usage and patient outcome with yeast susceptibility testing. Abstracts of the General Meeting of the American Society for Microbiology 95(0): 165

Nakazawa, Y., 1985: Sleep and biorhythm in man. Annals of Physiological Anthropology 4(4): 337-339

Kupferman, E., 1984: Using chlorine in the packinghouse. Postharvest pomology newsletter 2(4): 5-9

Ekong, D.; Ibiyemi, S., 1985: Biosynthesis of nibolide from melvalonic acid lactone in the leaves of Azadirachta indica. Phytochemistry 4(10): 2259-2261

Trichopoulou, A.; Vasilopoulou, E.; Georga, K., 2005: Macro- and micronutrients in a traditional Greek menu. The traditional Mediterranean diet is frequently being considered as a prototype for dietary recommendations. We have investigated a weekly menu typical of the Greek variant of the Mediterranean diet to examine the compatibility with the nutrition...

Terrazas, S.G., 2006: Adjuvant dressing for negative pressure wound therapy in burns. Ostomy/Wound Management 52(1): 16, 18-16, 18

Gunnison, A.F.; Bresnahan, C.A.; Palmes, E.D., 1977: Comparative sulfite metabolism in the rat, rabbit, and rhesus monkey. The clearance of injected sulfite, which is due principally to its metabolism to sulfate, was measured in rats, rabbits and rhesus monkeys for the purpose of estimating the in vivo function of sulfite oxidase. The order of clearance was rat > r...

Kagan, V.E.; Tyurina, Y.Y.; Forrest, K.Y.Z.; Orchard, T.J., 2001: Association between low molecular weight thiols and protein SH-groups and coronary artery disease among type 1 diabetes patients. Diabetes 50(Supplement 2): A156-A157, June

Zuckerman, A.M., 1993: Strategic responses of academic medical centers to the growth in ambulatory care. Alan M. Zuckerman, M.A., FAAHC, executive vice president of Chi Systems Inc., examines how academic medical centers are faring as ambulatory care becomes an increasing reality in this country. He presents geographic and integration strategies for...

Okolo, K.O.; Siminialayi, I.M.; Orisakwe, O.E., 2016: Protective Effects of iPleurotus tuber-regium on Carbon- Tetrachloride Induced Testicular Injury in Sprague Dawley Rats. The high rate of male infertility and the meager resources to manage same in sub Saharan Africa have necessitated the search for cost effective and available alternatives. Mushrooms have been used traditionally in folk medicine and as nutraceutica...