USDA 2016 (2015 pesticide residues on food).pdf

Lettuce head visually examine the head and remove

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Lettuce - Head Visually examine the head and remove wrapper and damaged or wilted leaves. Rinse and turn the head top side down to drain. Lettuce - Leaf Visually examine the sample and remove only the damaged or wilted leaves and any woody stems. Wash and drain. Nectarines & Peaches Wash and drain. Do not peel. Remove stem and leaves if present. Using a clean, dry knife, cut around the pit (i.e., without cutting through the pit). Remove the pit, being careful to remove as little of the meat as possible. Oranges Peel each fruit and remove any excess white membrane. Peanut Butter If product appears non-homogeneous (e.g., separation of oil from peanut butter), assure that the sample is evenly mixed prior to weighing of analytical portion. Pears Do not peel. Remove stem, if present. Using a clean, dry knife, cut each pear in half or quarters and remove the core portion. Potatoes Hold each potato under cold running tap water and gently scrub the entire surface with a clean vegetable brush to remove any loose soil and grit. Wash and drain. Spinach Visually examine the sample and remove only the damaged or wilted leaves and any woody stems. Wash and drain. Note: Bagged pre-washed spinach does not require washing by the laboratory. Strawberries Wash by the handful or by using a colander and drain. Remove stems and leaves if present. Sweet Corn Remove husk and silk from each ear. Wash and drain. Using a clean dry knife or other appropriate utensil, remove the kernels from cob. Tomatoes Wash and drain. Do not peel. Using a clean, dry knife, cut the tomato around the stem area. Remove any stem, being careful to remove as little of the meat as possible. The tomatoes may be quartered prior to homogenization. Watermelon Wash and drain. Using a clean, dry knife, cut each watermelon into quarters, and remove the rind. For large watermelons, take alternate quarters of each fruit for homogenization. For small watermelons, homogenize the entire sample. Table 4. Sample Preparation Steps for Analysis. This table lists the steps for preparing each collected commodity for analysis as defined in the Laboratory Standard Operating Procedure. The wash and drain steps refer to a wash under cold running water for approximately 15-20 seconds to assure that all surfaces are rinsed, then a drain for at least 2 minutes. For all commodities, the sample is chopped, mixed, or blended until a visually homogeneous mixture is attained.
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Pesticide Data Program—Annual Summary, Calendar Year 2015 14 in peanut butter samples. Samples were prepared according to the procedures detailed in Table 4. Samples were extracted using modifications of the QuEChERS method, and analyses were performed using GC/MS, GC-MS/MS, and LC-MS/MS. Quality Assurance Program The primary objectives of the QA/QC program are to ensure the reliability of PDP data and the performance equivalency of the participating laboratories. Direction for the PDP QA program is provided through SOPs initially based on EPA Good Laboratory Practices, along with program- specific QA/QC requirements. The PDP SOPs
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