NEMI Method Summary

Method Summary Information

Method Number: 70606 Media: SOILS/SEDIMENT
Revision: 1998
Method Source: Strategic Diagnostics, Inc.
Subcategory: ORGANIC Analytes in this method
Official Name: EnviroGard PAH in Soil Test Kit 70606 (SDI 1998) http://www.sdix.com/
Descriptive Name PAH immunoassay
Source Info: Strategic Diagnostics, Inc.
111 Pencader Dr.
Newark, DE 19702
phone: 302-456-6789
www.sdix.com
Citation: Strategic Diagnostics, Inc.
100656 Byte file
Brief Method
Summary:
 Inhibition immunoassay, with a colorimetric indicator for competitive binding of analyte and an enzyme-labeled conjugate to surface-immobilized antibodies. Colorimetric response is inversely related to the concentration of analyte in the sample or standard. Calibrated for phenanthrene. Sensitivity to phenanthrene less than to anthracene, fluoranthene, chrysene, pyrene, and benzo(a)pyrene. Reagents are purchased in kits with manufacturers' instructions for sample preparation and analysis. Requirements: a supply of clean water and methanol, to extract soil and sediment samples, to dilute sample extracts, and to prepare standards; filtration equipment to remove particulates from water samples and soil extracts; an analytical balance, to accurately determine weights of soil and sediment samples after drying and extraction; a spectrometer, which accepts sample tubes (SDI EnviroGard), for analyses at visible wavelengths (450 nm primary; 600 or 650 nm reference); equipment to automate sample preparation for large numbers of samples (prefiltration, measurement of uL volumes, rinsing, agitation), so that contact times with reagents are controlled as required; computerized data acquisition and processing. Expendable supplies - approximately $25 per determination.
Scope And
Application:
 Ambient and compliance monitoring. Can be used for Method 4035. Soil screening for polynuclear aromatic hydrocarbons by immunoassay (EPA 1995).
Applicable
Conc Range:
 1 - 100 ug/g as phenanthrene
Interferences: PAH tests (sensitivity to possible interferences, compared to phenanthrene): Sensitivity > phenanthrene: benzo(a)pyrene, fluoranthene, chrysene, pyrene, anthracene. Sensitivity < phenanthrene: indeno(1,2,3-cd)pyrene, benzo(a)anthracene, benzo(b)fluoranthene, benzo(k)fluoranthene, fluorene. Sensitivity << phenanthrene: dibenzo(a,h)anthracene, benzo(ghi)perylene, naphthalene, acenaphthalene, acenaphthylene
QC Requirements: Recommended for a kit allowing 20 semiquantitative determinations: a. calibration with 3 standards (1, 10, 100 ug/g) and 1 blank b. precision: 1 sample analyzed in duplicate (repeat) c. accuracy: 1 matrix sample, spiked at mid-range with the target analyte. d. validation: analysis of 1 positive and 1 negative sample by independent method for confirmation
Sample Handling: Samples are typically collected in glass containers with Teflon-lined caps. Immediate dilution of water samples with stabilizer (methanol:sample, 1:3, v/v) is recommended to inhibit adsorption of PAHs to the container. Samples are held in a refrigerator at 4 oC. Immunoassay reagents and kits are stored in the dark at 4 to 8 oC until use.
Soil and sediment samples need to be dried, weighed, and extracted (methanol; clean water). Soil extracts generally need to be centrifuged or prefiltered to 0.2 um. Quantitative analysis requires dilution of highly concentrated samples, until they are bracketed by standards in the linear response range. Aliquots of sample extracts and reagents are accurately measured (uL) and mixed for required times, following manufacturer's instructions for use of the materials purchased.
Max Holding Time:
 5 days at 4oC until extraction and analysis
 
Relative Cost: Less than $50
5635
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