DESETHYL DESISOPROPYL ATRAZINE (13C3, 99%) 100 UG/M…

ENDOSULFAN SULFATE (13C9, 99%) 100 UG/ML IN NONANE…

(+/-) BENZO[A]PYRENE-R-7,T-8,T-9,T-10-TETRAHYDRO- T…

1-HYDROXYPHENANTHRENE (13C4, 99%) 50 UG/ML IN TOLUE…

4-HYDROXYPHENANTHRENE (13C4, 99%) 50 UG/ML IN TOLUE…

9-HYDROXYFLUORENE (13C6, 99%) 50 UG/ML IN TOLUENE…

1-HYDROXYNAPHTHALENE (1-NAPHTHOL) (13C6, 99%) 50 UG…

PENTACHLOROANISOLE (13C6, 99%) 100 UG/ML IN TOLUEN…

7-CHLOROBENZ[A]ANTHRACENE (13C6, 99%) 50 UG/ML IN …

SEMICARBAZIDE HYDROCHLORIDE (SEM) (13C, 99%; 15N2, …