2,2',3,3',4,4',6-Heptachlorobiphenyl (171)

2,4,5-TP acid (Silvex)

Low level Nitrogen Calibration Units: 1x1mL ampoules or 10mL screwcapped bottle Nitrogen introduced using Aniline Catalogue No. Concentration Matrix: isooctane mg/kg (ppm) S-4142-0 Blank S-4142-05 0.5 S-4142-1

Tribenuron-methyl, 100 µg/ml, Acetonitrile, 1ml