Introduction
Acidic herbicides cover a broad range of compounds which are widely used in crop protection and general weed control. They tend to be extremely water soluble, and can easily enter surface and ground waters through natural drainage. Acid herbicides are toxic to humans and aquatic organisms, and are therefore monitored to low ng/L levels in potable and ground waters.
The on-line approach to sample preparation has grown in popularity because of its advantages in improved workflow and reduced sample handling:
- Little or no sample pre-treatment
- Totally automated procedures
- High precision and accuracy
- Elimination of blow down and reconstitution steps
- Reduced solvent use and disposal costs
Trace analysis of organics in water traditionally involves large sample volumes, labor intensive procedures and relatively high use of solvents. The on-line SPE approach uses a simple, well established hardware setup, and fully integrates sample preparation into the analytical workflow. Typical sample volumes of 1-10 mL, and lower solvent usage mean sample collection, transport and handling, along with solvent disposal costs, are much reduced.
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