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Efficiency of hexane extraction of napropamide from Aldrich humic acid and soil solutions
Year:
1999
Source of publication :
Journal of Environmental Quality
Authors :
Ben-Hur, Meni
;
.
Volume :
28
Co-Authors:
Williams, C.F., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Letey, J., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Farmer, W.J., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Nelson, S.D., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Anderson, M., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Ben-Hur, M., Agric. Res. Organ., Volcani Center, P.O.B. 6, Bet Dagan, Israel
Facilitators :
From page:
1751
To page:
1757
(
Total pages:
7
)
Abstract:
Dissolved organic matter (DOM) has been shown to form a stable complex with Napropamide [2(α-naphthoxy)-N,N-diethyl propionamide] and to facilitate its transport through soil columns. Liquid-liquid extraction of organics is a common method to transfer napropamide from water into an organic phase for gas chromatography analysis. A study was conducted to determine the effect of Aldrich humic acid, soil-derived dissolved organic matter, electrical conductivity, and hydrogen ion activity on the ability of hexane to extract napropamide from solutions and from soil extracts. The electrical conductivity of Aldrich humic acid solutions (0.0, 48, and 100 mg C L-1) were adjusted to 0.01, 0.97, and 1.69 dS m-1 by adding NaCl and CaCl2, and pH (8.2, 7.4, and 5.6) was adjusted using HCl and NaOH. Electrical conductivity had no effect on extraction efficiency. In the absence of DOM pH had no effect on extraction efficiency. Extraction efficiency decreased with increasing DOM concentration. Maximum reduction in extraction efficiency occurred in the presence of DOM when solution pH was near neutrality. A maximum extraction efficiency of 100% was observed in the absence of DOM and a minimum of 68% when napropamide was added to DOM solutions at pH 8.2 and then lowered to pH 5.6. Management practices such as liming and allowing napropamide to dry on the soil may increase environmental transport. Also quantification of napropamide in environmental samples can be affected by DOM.
Note:
Related Files :
Caustic soda
Dissolved organic matter (DOM)
Gas Chromatography
liquid scintillation counting
pesticides
pH
soil pollution
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30854
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:57
Scientific Publication
Efficiency of hexane extraction of napropamide from Aldrich humic acid and soil solutions
28
Williams, C.F., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Letey, J., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Farmer, W.J., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Nelson, S.D., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Anderson, M., Dep. of Environmental Science, Univ. of California, Riverside, CA 92521-0424, United States
Ben-Hur, M., Agric. Res. Organ., Volcani Center, P.O.B. 6, Bet Dagan, Israel
Efficiency of hexane extraction of napropamide from Aldrich humic acid and soil solutions
Dissolved organic matter (DOM) has been shown to form a stable complex with Napropamide [2(α-naphthoxy)-N,N-diethyl propionamide] and to facilitate its transport through soil columns. Liquid-liquid extraction of organics is a common method to transfer napropamide from water into an organic phase for gas chromatography analysis. A study was conducted to determine the effect of Aldrich humic acid, soil-derived dissolved organic matter, electrical conductivity, and hydrogen ion activity on the ability of hexane to extract napropamide from solutions and from soil extracts. The electrical conductivity of Aldrich humic acid solutions (0.0, 48, and 100 mg C L-1) were adjusted to 0.01, 0.97, and 1.69 dS m-1 by adding NaCl and CaCl2, and pH (8.2, 7.4, and 5.6) was adjusted using HCl and NaOH. Electrical conductivity had no effect on extraction efficiency. In the absence of DOM pH had no effect on extraction efficiency. Extraction efficiency decreased with increasing DOM concentration. Maximum reduction in extraction efficiency occurred in the presence of DOM when solution pH was near neutrality. A maximum extraction efficiency of 100% was observed in the absence of DOM and a minimum of 68% when napropamide was added to DOM solutions at pH 8.2 and then lowered to pH 5.6. Management practices such as liming and allowing napropamide to dry on the soil may increase environmental transport. Also quantification of napropamide in environmental samples can be affected by DOM.
Scientific Publication
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