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Determination of Alachlor, Atrazine, and Metribuzin in Soil by Resin Extraction
Author(s) -
Basta N.T.,
Olness Alan
Publication year - 1992
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1992.00472425002100030031x
Subject(s) - alachlor , chemistry , metribuzin , adsorption , atrazine , solid phase extraction , extraction (chemistry) , chromatography , ion exchange resin , pesticide , elution , isopropylamine , simazine , desorption , methanol , ion exchange , inorganic chemistry , ion , organic chemistry , weed control , agronomy , biology
Abstract An accurate and precise procedure for simultaneous resin extraction of alachlor (2‐chloro‐2′,6′‐diethyl‐N‐methoxymethylacetanilide), atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐1,3,5‐triazine), and metribuzin [4‐amino‐6‐(1,1‐dimethylethyl)‐3(methylthio)‐1,2,4‐triazin‐5(4H)‐one] in soil extracts is described. The procedure consists of three steps: (i) equilibration of resin extractors (RE) with water extracts of soil, (ii) elution of pesticides from RE by using methanol, and (iii) determination and confirmation of pesticide by dual‐column gas chromatography with thermionic specific detection. Recovery of dissolved pesticides by anion‐exchange resin, cation‐exchange resin, and nonpolar resin was studied. Ion‐exchange resins generally adsorbed pesticides well, but showed poor desorption characteristics. The effect of solution pH and salt concentration on pesticide adsorption by a nonpolar resin was studied. Quantitative amounts of pesticide (>95%) were adsorbed from solution by a nonpolar resin over a wide range of solution pH (2.5–10.0) and dissolved salt (0–100 m M NaCl). Pesticide adsorbed by RE ranged from 80 to 90%, and methanol desorbed 80 to 85% of adsorbed pesticides. Overall pesticide recoveries by the RE procedure were very reproducible with an average recovery of 67.7 ± 2.0%. Results obtained by the RE procedure agreed closely with those obtained by solid‐phase extraction (SPE) with octadecyl (C 18 ) bonded porous silica. Extraction time required by the RE procedure is a function of temperature and decreases from 5 d at 22 °C to 2 d at 75 °C. The RE procedure has the same degree of precision as C 18 ‐SPE and is inexpensive.