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Sorption and hydrolysis of carbaryl ...

Arroyo Daul, L. Jacqueline.

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Sorption and hydrolysis of carbaryl in clay-water suspensions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Sorption and hydrolysis of carbaryl in clay-water suspensions./
作者:	Arroyo Daul, L. Jacqueline.
面頁冊數:	102 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6117.
Contained By:	Dissertation Abstracts International65-12B.
標題:	Agriculture, Soil Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3158910
ISBN:	9780496915125

Sorption and hydrolysis of carbaryl in clay-water suspensions.
Arroyo Daul, L. Jacqueline.

Sorption and hydrolysis of carbaryl in clay-water suspensions. - 102 p.

Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6117.

Thesis (Ph.D.)--Michigan State University, 2004.

We studied the influence of clay preparation methods on sorption and hydrolysis of carbaryl by reference clay K-SWy-2.Three different ways of preparation were used: (1) unfractionated (whole clay), (2) fractionated by low speed centrifugation (clay-cent), and (3) fractionated by sedimentation (clay-sed). All clay preparations were K+ saturated. Each preparation manifested mineral fractions with significantly different abilities to hydrolyze carbaryl to 1-naphthol, decreasing in the order: whole clay >> clay-sed. > clay-cent. The extent of 1-naphthol disappearance from solution followed the order: whole clay >>> clay-sed. > clay-cent. X-ray diffraction of the heavy fraction revealed peaks corresponding to calcite and dolomite. Aqueous slurries of whole clay and claysed. were alkaline, whereas the pH of slurried clay-cent. was neutral. Dissolution of carbonates with sodium acetate buffer eliminated hydrolytic activity associated with SWy-2. We recommend for particle size separation the low speed centrifugation procedure followed by treatment with acetate buffer. Sorption of 1-naphthol, by reference clay K-SWy-2, at high and low pH, was studied. We used: (1) whole clay, (2) carbonate-free clay, and (3) carbonate-free clay amended with calcite. For whole clay and carbonate-free clay amended with calcite, &sim;80% and 90% of the initial concentration of 1-naphthol disappeared from solution within 24 h, corresponding to 2.0 and 2.3 mglg of clay, respectively. In carbonate-free clay, &sim;35% of the initial concentration of 1-naphthol was sorbed by the clay within 24 hours. Negligibly amounts (>1%) of 1-naphthol could be recovered from clay after methanol extractions. It is apparent that 1-naphthol is rendered unextractable by K-SWy-2. The FTIR spectra show that structural OH stretching and deformation bands are perturbed. The OH deformation bands show that only the OH deformation band associated with Fe3+ is reduced for the whole clay, but not for the carbonate-free clay. Oxidative products of 1-naphthol may be produced and caused the change and darkening of color in presence of clay and carbonates.

ISBN: 9780496915125Subjects--Topical Terms:

1017824
Agriculture, Soil Science.

Sorption and hydrolysis of carbaryl in clay-water suspensions.
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