National Institute for Occupational Safety and Health

“ Acetonitrile, HPLC grade.* Water, distilled, deionized. Thiram, reagent grade.* Air or nitrogen, compressed, for drying syringes. Calibration stock solution, 0.75 mg/mL. Dissolve an accurately weighed 7.5 mg Thiram in acetonitrile and dilute to 10 mL. Prepare fresh daily in duplicate.
See SPECIAL PRECAUTIONS.
1. Sampler: 1-μm PTFE membrane filter (Millipore FA or equivalent) , 37-mm diameter, two-piece polystyrene cassette filter holder with backup pad, sealed with tape or a shrinkable band. Filter holders made of Tenite should not be used. 2. ”

“ Remove filter from cassette with tweezers and place in 20-mL vial. Add 10 mL acetonitrile. Cap the vial. Rinse the inside top of cassette with 10 mL acetonitrile into a 20-mL vial. Cap the vial. Agitate samples during the 30-min desorption period.
CALIBRATION AND QUALITY CONTROL: 8.
Calibrate daily with at least six working standards over the range 0.005 to 3 mg Thiram per sample. a. Add known amounts of calibration stock solution to acetonitrile in 10-mL volumetric flasks and dilute to the mark. b. Analyze together with samples and blanks (steps 9 and 10) . c. ”

“ Ibid, V. 1, P&CAM 228, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 77-157-A (1977) . Failure Report S256, NIOSH Contract CDC-99-74-45 (unpublished, 1976) . Criteria for a Recommended Standard...Occupational Exposure During Manufacture and Formulation of Pesticides, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 78-174 (1978) . NIOSH Research Report-Development and Validation of Methods for Sampling and Analysis of Workplace Toxic Substances, U.S. Department of Health and Human Services, Publ. (NIOSH) 80-133 (1980) . ”