SYMPOSIA PAPER Published: 01 January 1993

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


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.

Author Information

Schwab, AP
Throckmorton Hall, Manhattan, KS
Splichal, P
Throckmorton Hall, Manhattan, KS
Sarong Sonon, L
Throckmorton Hall, Manhattan, KS
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Developed by Committee: D18
Pages: 86–91
DOI: 10.1520/STP23873S
ISBN-EB: 978-0-8031-5225-0
ISBN-13: 978-0-8031-1475-3