Reference substances. (A) The ref- erence substances need not be em- ployed in all cases when investigating a new substance. They are provided pri- xxxxxx so that calibration of the meth- od may be performed from time to time and to offer the chance to compare the results when another method is ap- plied.
Appears in 9 contracts
Samples: www.govinfo.gov, www.govinfo.gov, www.govinfo.gov
