STP1162

    Factors Affecting the Soil Extraction and Preconcentration by C18 Solid-Phase Enrichment of Alachlor, Atrazine, and Atrazine Dealkylation Products

    Published: Jan 1993


      Format Pages Price  
    PDF (116K) 6 $25   ADD TO CART
    Complete Source PDF (2.8M) 6 $58   ADD TO CART


    Abstract

    Conventional liquid extraction of herbicides from soils followed by an evaporative concentration step is tedious, expensive, and subject to contamination. An alternative method was developed using methanol extraction and solid-phase enrichment by a C18 cartridge. Acetonitrile, methanol, and a mixture of 10 mL water in 100 mL methanol recovered similar fractions (52 to 98%) of applied alachlor [2-chloro-N-(2,6-diethylphenyl)-7V-(methoxymethyl)acetamide] and atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4,diamine] with the exception of the water-methanol, which was the least efficient in one soil. Extraction of herbicides from water and water-methanol mixtures by C18 cartridges was found to be extremely efficient, but the presence of small quantities of methanol greatly reduced the affinity of the cartridges for deethylatrazine and deisopropylatrazine, dealkylation products of atrazine. Shaking time and mass of the subsample were found to have little effect on the efficiency of extraction.

    Keywords:

    alachlor, atrazine, deisoproplyatrazine, deethylatrazine, extraction, soil


    Author Information:

    Schwab, AP
    Associate professor and graduate research assistants, Kansas State UniversityThrockmorton Hall, Manhattan, KS

    Splichal, P
    Associate professor and graduate research assistants, Kansas State UniversityThrockmorton Hall, Manhattan, KS

    Sarong Sonon, L
    Associate professor and graduate research assistants, Kansas State UniversityThrockmorton Hall, Manhattan, KS


    Paper ID: STP23873S

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP23873S


    CrossRef ASTM International is a member of CrossRef.