Molecularly Imprinted Nanomicrospheres as Matrix Solid-Phase Dispersant Combined with Gas Chromatography for Determination of Four Phosphorothioate Pesticides in Carrot and Yacon

Table 4

Recovery rates of four pesticides in the spiked blank carrot samples when molecularly imprinted nanomicrospheres were used for extracting pesticides and results of actual samples (mean ± SD, ).

Pesticides	Samples (ng·g^−1)	Spiked level = 0.5 ng·g^−1		Spiked level = 2.5 ng·g^−1
	Carrot	Detected content	Recovery (%)/RSD (%)	Detected content	Recovery (%)/RSD (%)
Phoxim	0.83	0.431 ± 0.026	86.2/(6.0)	2.29 ± 0.22	91.6/(9.6)
Tolclofos-methyl	0.69	0.445 ± 0.028	89.0/(6.3)	2.64 ± 0.23	105.6/(8.7)
Chlorpyrifos	N.D	0.452 ± 0.029	90.4/(6.4)	2.25 ± 0.19	90.0/(8.4)
Parathion-methyl	N.D	0.464 ± 0.034	92.8/(7.3)	2.43 ± 0.18	97.2/(7.4)

N.D: no detection; RSD: relative standard deviation.