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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Статья в журнале

Adsorption Kinetics of Glyphosate and Copper(II) Alone and Together on Two Types of Soils  [2009]

Wang, Yu-Jun; Cui, Yu-Xia; Zhou, Dong-Mei; Wang, Shen-Qiang; et al.

Доступ к полному тексту

Glyphosate [N-(phosphonomethyl)glycine] is a nonselective, postemergence herbicide that contains multiple functional groups, which can form strong coordination with metal cations to give bidentate and tridentate complexes. The complexation of glyphosate with metal cations may affect their distribution and bioavailability in soils. Adsorption kinetics of glyphosate and Cu(II) alone and together were studied using a continuous flow experimental setup on two soils with different characteristics at pH5.5. Four kinetic models, i.e., the Lagergren first-order, pseudo-second-order, Elovich, and power function equations, were successfully used to describe their adsorption kinetics. Among the four models, the Lagergren first-order kinetic model fit the experimental data of glyphosate and Cu(II) adsorption the best. Glyphosate significantly increased the adsorption quantity of Cu(II) on the Red soil (a Hapludult or Udic Ferrosol), due to the fact that Cu(II) was adsorbed on the sites where glyphosate had been strongly adsorbed. Glyphosate decreased the adsorption of Cu(II) on the Wushan soil (a Haplaquept or Anthrosol), however, because adsorption of glyphosate on this soil was weak and the complex of glyphosate and Cu(II) tended to be highly soluble in water, thus preventing Cu(II) from exchanging with Ca2+ and Mg2+ ions on the soil surface. On the other hand, the presence of Cu(II) decreased the adsorption of glyphosate on both soils, which may be attributed to th
e lower affinity of the Cu(II)–glyphosate complex to the soils than glyphosate alone.
Журнал
Soil Science Society of America journal
ISSN : 0361-5995

Библиографическая информация

Язык:
English
Тип:
Journal Article
В АГРИСе с:
2013
Том:
73
Выпуск:
6
Стартовая страница:
1995
Конечная страница:
2001
Все названия:
"Adsorption Kinetics of Glyphosate and Copper(II) Alone and Together on Two Types of Soils"@eng
Другое:
"Includes references"
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Библиографическая информация

Язык:
English
Тип:
Journal Article
В АГРИСе с:
2013
Том:
73
Выпуск:
6
Стартовая страница:
1995
Конечная страница:
2001
Все названия:
"Adsorption Kinetics of Glyphosate and Copper(II) Alone and Together on Two Types of Soils"@eng
Другое:
"Includes references"