Table B2.4.2 Holding Times1 and Preservation for Soil and Sediment Samples Analysis Extraction/Digestion Analysis Time Preservation Times (maximum Method2 holding time) Cool 60C, and collect in hermetically sealed vials; low-medium levels Volatile Organic 2 days if unpreserved, sodium bisulfate then NA Compounds (VOCs) 14 days if preserved cool 60C3; medium - high levels use methanol then cool 60C. Semi-volatile Organics Base/neutral/acids within 40 days after 14 days cool 60C (BNA) extraction Pesticides/PCBs Metals 6 months or ASAP 6 months cool 60C after digestion Mercury ASAP after extraction 28 days cool 60C Hexavalent Within 4 days after 28 days cool 6 0C Chromium extraction Sulfides NA 14 days cool 60C Cyanides NA 14 days cool 60C Cyanides NA 14 days cool 60C TCLP Parameters within 14 days after cool 60C VOCs 14 days extraction cool 60C Semi-Volatile within 40 days after Organics, BNAs and 14 days/7 days to prep extraction Pesticides/PCBs within 6 months after Metals 6 months HNO3 to pH<2 extraction within 28 days after HNO3 to pH<2 Mercury 28 days extraction 1Holding Notes: times begin at the time of collection. 2Preservation temperature may fluctuate by 20C. 3For calcareous soils, no pH adjustment, cool and have immediately analyzed.
Table B2.4.2 Holding Times1 and Preservation for Soil and Sediment Samples Analysis Extraction/Digestion Times Analysis Time (maximum holding time) Preservation Method2 Volatile Organic Compounds (VOCs) NA 2 days if unpreserved, 14 days if preserved Cool 60C, and collect in hermetically sealed vials; low-medium levels sodium bisulfate then cool 60C3; medium - high levels use methanol then cool 60C. Semi-volatile Organics Base/neutral/acids (BNA) Pesticides/PCBs 14 days within 40 days after extraction cool 60C Metals Mercury Hexavalent Chromium 6 months 28 days 28 days 6 months or ASAP after digestion ASAP after extraction Within 4 days after extraction cool 60C cool 60C cool 6 0C Sulfides NA 14 days cool 60C Cyanides NA 14 days cool 60C Cyanides NA 14 days cool 60C TCLP Parameters VOCs 14 days within 14 days after extraction cool 60C Semi-Volatile Organics, BNAs and Pesticides/PCBs 14 days/7 days to prep within 40 days after extraction cool 60C Metals 6 months within 6 months after extraction HNO3 to pH<2 Mercury 28 days within 28 days after extraction HNO3 to pH<2 Notes: 1Holding times begin at the time of collection. 2Preservation temperature may fluctuate by 20C. 3For calcareous soils, no pH adjustment, cool and have immediately analyzed.
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