Interference Standard 4

4-Hydroxyisophthalic acid (4-Hydroxybenzene-1,3-dicarboxylic acid), 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 636-46-4

3-Bromo-4'-fluorodiphenyl ether, 50µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 50904-38-6

Phosphorus ASTM D-3231