Guide for Characterization of Sites Contaminated with Energetic Materials
47
Calibration Standards
Analytical standards containing all of the explosive analytes listed for
Method 8330 can be purchased as a mixed stock standard (each analyte 1.00
mg/mL) from AccuStandard, Inc. (New Haven, Connecticut). These commer-
cially prepared stock standards need to be specially prepared using acetone as the
solvent. Additional standards, e.g., PETN, NG, and 3,5-DNA, are also commer-
cially available from the same vendor.
Instrument Calibration
Initially a five-point calibration curve should be established. This number of
standards allows a nonlinear model (quadratic through the origin) to be used
when a linear regression through the origin fails to establish a correlation coeffi-