Figure 6.

Effect of paraquat on the photocurrent (green line); when a small amount of the compound was injected (final concentration 0.5 µM) an increase in photocurrent was seen. For higher concentrations the photocurrent increased further and was more than doubled at 10 µM atrazine (final concentration) as compared with that in the absence of atrazine. However, after a few cycles of illumination the photocurrent decreased again to its initial level, while the dark current remained high. The current response of the abiotic control is shown with a red line.