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Spectroscopic Evidence for a Copper‐Picloram Complex on Cu(II)‐Saturated and Cu(II)‐Hydrous Oxide Coated Montmorillonite
Author(s) -
Aochi Y.,
Farmer W. J.
Publication year - 1988
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/sssaj1988.03615995005200050009x
Subject(s) - picloram , montmorillonite , inorganic chemistry , copper , oxide , mineral , chemistry , infrared spectroscopy , organic chemistry , biology , horticulture
Deuteration and deconvolution techniques were applied to infrared investigations of bonding between the herbicide picloram (4‐amino‐3,5,6‐trichloropicolinic acid) and mineral surfaces. Self‐supporting clay films for infrared analysis were prepared from aqueous suspensions of picloram with Cu‐treated montmorillonite or with montmorillonite coated with Cu hydrous oxides. The spectral data show clear evidence for a coordination type bonding between picloram and the Cu‐treated mineral surfaces. Additional evidence is presented from infrared data confirming the presence of the monomeric acid on Al‐ and Fe‐treated montmorillonite. Deuteration of the picloram‐Cu‐montmorillonite and of the picloram‐Cu hydrous oxide‐montmorillonite systems were both extremely slow, requiring several weeks to complete compared to a few hours for the Al‐ and Fe‐systems.