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Apparatus for Studying Pesticide Degradation in the Vadose Zone
Author(s) -
Isensee Allan R.
Publication year - 1992
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1992.03615995005600010055x
Subject(s) - vadose zone , pesticide , atmosphere (unit) , casing , degradation (telecommunications) , hydrology (agriculture) , environmental science , soil science , environmental chemistry , geology , soil water , chemistry , geotechnical engineering , agronomy , petroleum engineering , meteorology , geography , biology , telecommunications , computer science
Abstract An apparatus was constructed to study pesticide degradation in situ under vadose‐zone conditions. The apparatus consists of a 15‐cm (i.d.) casing and an enclosed vadose exposure chamber wherein pesticide‐treated soil cores, placed in the chamber, can be equilibrated with the surrounding vadose zone at selected depths. Monitored for 100 d, O 2 concentrations at 0.5‐, 1.0‐, and 2.0‐m depths were nearly identical to O 2 concentrations in control samplers, indicating that the apparatus was in equilibrium with the soil atmosphere and is appropriately isolated from the surface atmosphere. Both radiolabeled and unlabeled pesticides can be studied in the apparatus because the chamber is self‐sealing in the event of unexpected flooding.