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Main Title Comparison of Methods for Collecting Interstitial Water for Trace Organic Compounds and Metals Analyses.
Author Schults, D. W. ; Ferraro, S. P. ; Smith, L. M. ; Roberts, F. A. ; Poindexter, C. K. ;
CORP Author Environmental Research Lab.-Narragansett, Newport, OR. Pacific Ecosystems Branch. ;AScI Corp., McLean, VA.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-93/196 ;ERNL-N087;
Stock Number PB93-199552
Additional Subjects Water pollution sampling ; Interstitial water ; Organic compounds ; Metals ; Sediments ; Chemical analysis ; Sorption ; Experimental design ; Error analysis ; Accuracy ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB93-199552 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
Several common materials and methods used to collect interstitial water (IW) were evaluated to determine their effect on the accuracy and precision of measured concentrations of selected organic compounds and metals. The concentration of pollutants in dosed seawater before and after exposure to stainless steel and Teflon centrifuge tubes, glass fiber and Nuclepore filters, cellulose dialysis membranes and fritted glass tubes were compared. Exposure to most hardware materials did not significantly affect the concentration of four metals (Cd, Cr, Cu, Pb) but there was significant loss (up to 79 percent) of two organic compounds (fluoranthene, p,p'-DDE) to almost all the hardware materials tested. Of five commonly used IW collection methods (centrifuging, centrifugal drainage or basal cup, squeezing, vacuum filtration and dialysis) investigated, the centrifuge method was judged the most accurate and precise for polycyclic aromatic hydrocarbons and PCBs. All IW collection methods tested showed high variability for the metals. As a result, with one exception (Cu), there was no significant difference detected in the accuracy of the methods for metals.