Quantitative determination of diquat and paraquat in drinking water via EPA method 549.2 using Horizon 5000

The Horizon 5000 automated extraction system is a programmable, multipurpose SPE system, capable of processing aqueous samples directly from their original containers. Once the process is initiated, each Horizon 5000 module delivers all the necessary solvents to precondition the sorbent material within the SPE disk, passes the water sample through the disk and, after a preset air-dry time, extracts the sorbed analytes from the disk into a collection vessel using the required amounts of solvents.

The scope of this application note is to demonstrate the process used to extract diquat and paraquat from reagent water using the Horizon 5000 in tandem with the ISOLUTE C8(EC) 500 mg/6 mL solid phase extraction cartridge. The procedure will outline the extraction of the two herbicides in reagent water, following guidelines from the initial demonstration of capability (IDC) within US Environmental Protection Agency (EPA) method 549.2.