WS Disinfection By-Products - Cal Check 1

trans-Urocanic acid, 100mg

1,4,6-Trimethylnaphthalene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 2131-42-2

Atrazine-2-hydroxy D5, 100µg/mL in MeOH, 1,1ml