Residue analysis using PDA for low concentrations.

Good morning,

I am developing a waste method on agilent 1260 infinity II, working concentration 0.016 ppm, column C18 75 x 4.6 mm and 3.5 um, mobile phase: MeOH (70%) - Phosphate buffer pH 2.5 (30 %), Flow: 0.8 mL/min, under these chromatographic conditions my LQ is 0.03 ppm, above my working concentration.

The detector is a PDA, to see if I got a chromatographic response, we added a 1500 uL Loop to the equipment, with it nothing comes out, just noise.

What can I do to work at these low concentrations using the detector as a PDA?

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