Evaluating the impact of extraction and cleanup parameters on the yield of total petroleum hydrocarbons in soil |
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Authors: | Eija Saari Paavo Perämäki Jorma Jalonen |
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Institution: | (1) Department of Chemistry, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland |
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Abstract: | Interlaboratory comparisons for the analysis of mineral oil in polluted soil using the GC–FID method indicate that extraction
and cleanup conditions have significant effects on the analytical results. In this investigation a ruggedness test was performed
on the extraction and cleanup method for the determination of total petroleum hydrocarbons in soil. A two-level Plackett–Burman
design was utilized to study the effect of 11 different method parameters on the extraction recovery of total petroleum hydrocarbons
(TPH) in soil. Both qualitative and quantitative factors were investigated. The results indicate that total petroleum hydrocarbons
can be relatively reliably monitored through strict implementation of the ISO and CEN draft standards. However, variation
in certain method parameters readily affects the validity of the results. The most critical factors affecting TPH recovery
were the solvent and co-solvent used for extraction, the extraction time, adsorbent and its weight and sample TPH concentration.
Because adaptation of the draft standards especially with respect to these factors easily leads to TPH recoveries higher than
200% or lower than 70%, the validity of the adapted method should always be verified. A proper estimate of the expanded uncertainty
should also be appended to TPH results, because only then can the reliability of the results be guaranteed and further justification
is gained to support the end-use of the data. This also supports the credibility of the analytical services and prevents the
data end-users from drawing misleading conclusions concerning the environmental risks and potential remediation requirements. |
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Keywords: | Total petroleum hydrocarbons Extraction recovery Plackett– Burman design Ruggedness |
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