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|Title:||Evaluation of pre-extaraction analytical holding times for tetryl in soil|
|Authors:||U.S. Army Environmental Center.|
Jenkins, Thomas F.
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 94-5.|
Abstract: A study was conducted to experimentally evaluate the maximum acceptable pre-extraction analytical holding times (MHTs) for tetryl in soil. Three soils fortified with tetryl at the low microgram-per-gram level were used in the study. Subsamples of each soil were extracted with acetonitrile in an ultrasonic bath after being held for 0, 1, 3 and 7 days at either room temperature (22°C), under refrigeration (2°C) or frozen (-15°C). Extracts were analyzed by RP-HPLC. Tetryl concentrations in soils stored at room temperature and under refrigeration declined rapidly over the 7-day study period and several transformation products accumulated. After 7 days of storage at 2°C, tetryl concentrations were reduced by 46, 97 and 99% in the three soils studied. When the soils were frozen, there were no statistically significant analyte losses over the 7-day study period (95% confidence level). On the basis of the results of these experiments, the recommended MHT for soils containing tetryl is 7 days if kept frozen. Longer holding times may be possible, but they were not investigated here. Refrigeration is inadequate to prevent significant transformation of tetryl in soil samples being held for analysis. A question regarding the ability to use analyte-fortified soil to mimic field-contaminated soils in holding time studies is raised.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Special Report|
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