Recommendations for holding times of environmental samples
Experiments have been conducted for the purpose of establishing acceptable minimum holding times for soil and water samples. Analytes of interest have been volatile organics, pesticides, and explosives. The pesticides and explosives represent subclasses of semivolatile organics. Several soils and several water samples have been used in this investigation. The holding times for volatile organics in water samples are dependent on the objectives of the analysis. Aromatics and some haloethanes are stable in water for limited times, approximately 14 days is the recommended maximum. However, the degradation of these compounds can be eliminated or greatly reduced by preservation with acid. Several acids are recommended, including HCl, ascorbic acid, and sodium hydrogen sulfate. For analyses where only certain volatiles are to be considered, as in the case of RCRA monitoring, individual holding times can be recommended. For many of these volatiles, holding times can be recommended as long as one year, even without preservation.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6975841
- Report Number(s):
- CONF-880768-2; ON: DE88011831
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400100* -- Analytical & Separations Chemistry
510200 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AROMATICS
CHEMICAL EXPLOSIVES
EXPLOSIVES
HYDROGEN COMPOUNDS
MATTER
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PESTICIDES
SAMPLE PREPARATION
SAMPLING
SOILS
VOLATILE MATTER
WATER