WS Disinfection By-Products - Cal Check Back Catalog number: 91837 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 52313 Lanthanum Chloride Modifier (La) Price on request 81403 Chlorpyrifos, 1000µg/ml in Hexane 1ml Price on request CA14995000 Methanol, certified, 5ml Price on request