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Calibration plots of chlorpyrifos (blue line), carbaryl (red line), and the mixture of chlorpyrifos and carbaryl (black line) by (a) SPE/Kaol/AuNPs/AChE/CS CS biosensor in 0.1 M PBS (pH 9.0) containing 15 mM ATCh, (b) SPE/Mt/AuNPs/AChE/CS, (c) SPE/Bent/AuNPs/AChE/CS, and (d) SPE/Sep/AuNPs/AChE/CS biosensors in 0.1 M PBS (pH 9.0) containing 10 mM ATCh.
