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(a) PCA score plots of chlorpyrifos (red dot), carbaryl (blue dot), and a mixture of chlorpyrifos and carbaryl at equivalent concentrations (green dot) in the carrot sample, (b) PCA score plots of a mixture of chlorpyrifos and carbaryl at different concentration ratios in synthetic pesticide solutions (black dot) and carrot samples (orange dot) using SPE/Kaol/AuNPs/AChE/CS, SPE/Mt/AuNPs/AChE/CS, SPE/Bent/AuNPs/AChE/CS, and SPE/Sep/AuNPs/AChE/CS sensors.
