Surveillance sampling

Overall, in 234 ready-to-eat foods tested 37 times each as part of the FDA Total Diet Studies from 1982 to 1991, endrin was found only 26 times at an average concentration of 0.0027 pg/g (2.7 ppb) in 9 different foods broccoli, cantaloupe, collards, cucumbers, onion rings, dill pickles, pumpkin pie, summer squash, and winter squash (KAN-DO Office and Pesticides Team 1995). Concentrations ranged from 0.0011 pg/g (1.1 ppb) (broccoli) to 0.0041 pg/g (4.1 ppb) (summer squash). In a summary of 1985-91 FDA pesticide residue findings, endrin was not reported in more than 10,000 surveillance samples of domestic and imported foods that may be eaten by infants or children, or in more than 4,000 analyses of Total Diet Study foods eaten by infants and children (Yess et al. 1993). 

Species Monitoring sample units Surveillance sample units ... 

The U.S. FDA monitors foods for half of the approximately 300 pesticides having official EPA tolerances as well as a number of other pesticides that have no official tolerances. Multiresidue methods, most of which are based on chromatography protocols, are employed (7). Not all pesticides are monitored on all foods and sampling (qv) is purposely biased to catch possible problems. The overall incidence of illegal pesticide residue is, however, quite small 1% for domestic surveillance samples and 3% for imported foods. The methods employed can usually quantify residues present at 0.01 ppm. Quantitation limits range from 0.005 to 1 ppm. 

The objective of surveillance sampling is to evaluate the occurrence and incidence of a potential residue concern... 

C-Mn weld data shown in Fig. 9.28. Here, there is no significant effect on the level of P segregation to boundaries at doses up to 13.4 mdpa for both surveillance samples and surveillance samples given an additional accelerated irradiation to a higher dose. 

The FDA requires drug withdrawal times on some of them, in order to protect consumers from residues. Additionally, federal agencies (USDA and/or FDA), as well eis certain state and local regulatory groups, conduct continuous surveillance, sampling programs, and analyses of meats and other food products on their content of drugs and additives. 

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