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' a small sample (i e 5 gram of soil is agitated with solvent After adding a color <br /> development catalyst the hue and intensity are compared with color standards to <br /> ' determine the contaminant type and concentration The Handby Method was <br /> documented in EPA report number 530/UST 90/003 Field Measurements <br /> Dependable Data When You !Need It, published September 1990 The method is <br /> ' dependable for field screening Confirmation samples to verify cleanliness levels <br /> will be made after reaching minimum detection levels <br /> ' Portable Photo-ionization Detector <br /> Organic vapors in sod and water may be detected using a Portable Photo-ionization <br /> ' Detector (PID) The device uses an ultraviolet light detector and is especially <br /> sensitive to aromatics such as benzene, toluene and xylene with decreasing <br /> sensitivity to non-aromatic hydrocarbons and chlorinated hydrocarbon solvents <br /> ' Care should be used in interpreting readings where mixed vapor is encountered <br /> because sensitivity may vary The user should be familiar with the limitations of the <br /> calibration gas in use This instrument is useful as a general field survey tool <br /> ' Flame Ionization Detector <br /> Organic vapors in soil and water may be detected using a Flame Ionization <br /> Detector(FID) This is an organic vapor analyzer(OVA)that is similar to a PID unit, <br /> but uses a hydrogen flame detector instead of ultraviolet light to measure gas <br /> ' vapor The unit can operate as a limited field unit or as a gas chromatograph The <br /> commonly used OVA is factory-calibrated to methane Therefore, readings can <br /> only be reported relative to the methane standard used In the field survey mode, <br /> ' the FID reflects the total concentration of fuel vapors present <br /> 1 <br /> ' C- 11 <br />