You are not entitled to access the full text of this document Deterioration of lecithin-adhered zinc phosphide baits in alfalfa

A 2·00 (±0·36)% zinc phosphide (Zn3P2, CAS no. 1314-84-7) steam-rolled-oat (SRO) groats bait containing 1·04% lecithin vehicle was broadcast in alfalfa (Medicago sativa). Samples of bait were collected immediately after broadcast, and 1, 7 and 14 days after exposure to existent agronomic and climatological conditions. Analyses of respective samples yielded 1·80 (±0·36)%, 1·18 (±0·04)%, 1·20 (±0·11)%, and less-than-or-equals, slant0·26 (±0·05)% Zn3P2. A not, vert, similar10% loss of Zn3P2 occurred immediately due to mechanical broadcast; not, vert, similar33% loss was noted 1–7 days after exposure to pH 6·0 soil and 0·05 cm rainfall; and greater-or-equal, slanted87% loss of Zn3P2 occurred by day 14 following an additional 0·96 cm rainfall. Mechanical, precipitation and soil-acidity factors are viewed to reduce the concentration of Zn3P2-grain baits in crop situations. Lecithin-adhered Zn3P2 baits showed a relatively rapid decline in concentration of active ingredient (A.I.) after broadcast and exposure to slight moisture — a useful attribute of these baits in areas where hazards to nontarget wildlife are of concern.