Interference Standard 4 Back Catalog number: 52041 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C16610000 Pyrazophos, 250mg Price on request C11601300 Chlorpyrifos-methyl-desmethyl sodium, 25mg Price on request 11706.12-100-IO 3,3',4,5'-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL, Price on request