"Internal standard" means a substance which is added to the sample vial in a known concentration, which is chemically similar to the analyte being determined and against which the analyte can be measured.
N.H. Admin. Code § Saf-C 6301.21
#8064, INTERIM, eff 4-1-04, EXPIRES: 9-28-04 (See Revision Note at chapter heading for Saf-C 6300); ss by #8114, eff 7-14-04; ss by #9683, eff 3-23-10 (from Saf-C 6301.25 )