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SOURCES OF ERROR IN ANALYSIS OF MUNICIPAL SLUDGES AND SLUDGE-AMENDED SOILS FOR DI(2-ETHYLHEXYL) PHTHALATE
Citation:
Eiceman, G., J. Gardea-Torresdey, G. O'Connor, AND N. Urquhart. SOURCES OF ERROR IN ANALYSIS OF MUNICIPAL SLUDGES AND SLUDGE-AMENDED SOILS FOR DI(2-ETHYLHEXYL) PHTHALATE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/515.
Description:
Rapid quantitative determination of di-(2ethylhexyl) phthalate (DEHP) in municipal sludge is described for capillary gas chromatography/mass spectrometry (GC/MS) using selected ion monitoring with isotope dilution techniques. ropagation of error through a four-step technique is measured as an increase in variance with each additional step. tepwise accumulated variation (as a percentage of total error) as GC/MS analysis with data reduction, 3%; analyst (sample preparation), 8%; heterogeneity of sludge, 30%; heterogeneity in sludge-amended soil, 77%; and errors between planters, 100%. he relative standard, deviation (RSD) associated with analysis of sludge alone was 16% at 51 mg kg-1 DEHP. Analysis precision was dependent on sample size and DEHP concentration. he RSD for a 13 mg kg-1 DEHP loading in soil/sludge mixtures for a greenhouse study was 26.5%. etection limits for DEHP in sludges with rapid screening procedures were fixed by interfering extractable matrices.