Paraquat and Diquat are widely
used in agriculture and industry. They are
employed as contact herbicides, as harvest aids,
for pasture renovation and for aquatic weed
control. Their environmental persistence allows
for contamination of water supplies; wells, lakes,
rivers, etc. Since Paraquat is a Class I Toxin and
Diquat is a Class II Toxin, water resources must
be monitored for the presence of these herbicides.
This method employs ion
exchange chromatography so filtration is the only
sample preparation necessary. Also, since both
Paraquat and Diquat have a fixed +2 charge, 2 mL
can be injected without peak degradation.
Post-column derivitization improves sensitivity
and greatly improves selectivity by shifting the
detection to longer wavelengths.
METHOD
Analytical Conditions
COLUMN:
ALKION™column 4 x
150mm, Catalog No. 9410917,
Guard column 3 x 20mm,
Catalog No. 9493020
