SIR #: 389
Section: V1M4, Section 220.127.116.11
The Standard states that all initial calibrations must be verified by a second source. If a method requires a surrogate or internal standard, do the surrogates and/or internal standards also need to be verified by a second source?
TNI FINAL RESPONSE:
No, V1M4 18.104.22.168. does not apply to internal standards or surrogates. Section 22.214.171.124 addresses the calibration of analytes. An analyte is defined in V1M2 as "A substance, organism, physical parameter, property, or chemical constituent(s) for which an environmental sample is being analyzed." Internal standards and surrogates do not meet the definition of an analyte.