2003) noted that although many organophosphorus pesticides were used in the Salinas Valley, the applied amount of chlorpyrifos was similar to that of oxydemeton-methyl
but less than that of either malathion or diazinon for each of the years 1999-2001.
2003) transformed the dimethyl metabolites to low, benign levels of oxydemeton-methyl (2.
Pesticides in the pilot study included cadusafos, chlorpyrifos, diazinon, dimethoate, ethoprop, malathion, omethoate, oxydemeton-methyl, and terbufos.
We assumed that urinary diethyl phosphate metabolites were attributable to chlorpyrifos, diazinon, or disulfoton and that dimethyl phosphate metabolites were attributable to dimethoate, malathion, methidathion, naled, or oxydemeton-methyl
Oxydemeton-methyl has the highest chronic toxicity [daily reference dose (RfD) = 0.
Individual dimethyl OP pesticide doses were calculated assuming that all exposure came either from oxydemeton-methyl, malathion, azinphosmethyl, or phosmet (Table 4).
If a more toxic pesticide is chosen, such as oxydemeton-methyl, nearly all of the estimated daily doses are above the U.
The difference in dose estimates attributed to either malathion or oxydemeton-methyl reflects the large range of toxicities within the organophosphate class.