MEASURING TRANSPORT OF LAWN-APPLIED HERBICIDE ACIDS FROM TURF TO HOME- CORRELATION OF DISLODGEABLE 2,4-D TUFF RESIDUES WITH CARPET DUST AND CARPET SURFACE RESIDUES

Transport of lawn-applied herbicides into the home via walking over tr eated turf, defined here as track-in, was measured at five different t imes out to 1 week after application. Residues of turf-applied 2,4-D a nd dicamba were measured in carpet dust and on the carpet surface afte r track-in. Both carpet dust levels and carpet surface dislodgeable re sidue levels were highly correlated with turf dislodgeable residue lev els. Turf dislodgeable residues were 0.1-0.2% of turf application leve ls. Transfer of herbicides from turf to carpet dust was 3% of the turf dislodgeable residues. Transfer from turf to carpet surface was 0.3% of the turf dislodgeable residues. Herbicide 2,4-D was measured in the carpet dust of suburban homes at the 0.1-5 mu g/g levels that are pre dicted by this efficiency of mass transfer. New tools used to collect these samples included the polyurethane foam roller dislodgeable resid ue sampler and the high-volume solid surface sampler.