|Thurman, E - U S GEOLOGICAL SURVEY|
Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: February 28, 1996
Publication Date: N/A
Technical Abstract: A soil extracting agent based on cation exchange as the primary mechanism for soil sorption of hydroxylated atrazine degradation products (HADPs) is proposed. Soil samples were spiked with 5000 Bq each of **14C-hydroxyatrazine (HA), **14C-deethylhydroxyatrazine (DEHA), or **14C-deisopropylhydroxyatrazine (DIHA) and incubated for 72 h at room temperature. Duplicate samples were extracted with either 80% CH3OH, pH=1 or the newly proposed extracting agent, 0.5M KH2PO4,pH=7.5/CH3CN, 3:1. Samples were extracted for 1 h, centrifuged, supernatant recovered, and then, re-extracted for an additional 1 h. The supernatants were combined, and radioactivity was determined by liquid scintillation. Extraction efficiencies for the cation exchange method were 99.8% for HA, 83.3% for DEHA, and 77.0% for DIHA. In comparison, extraction efficiencies of the acidified methanol were 46.1% for HA, 60.4% for DEHA, and 5.5% for DIHA. On the basis of these results, it was concluded that cation exchange was the primary sorption mechanism for HADPs in this soil.