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

Table 5

Recovery rates of four pesticides in the spiked blank yacon 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
	Yacon	Detected content	Recovery (%)/RSD (%)	Detected content	Recovery (%)/RSD (%)
Phoxim	N.D	0.447 ± 0.025	89.4/(5.6)	2.38 ± 0.22	95.2/(9.2)
Tolclofos-methyl	0.47	0.427 ± 0.021	85.4/(4.9)	2.31 ± 0.19	92.4/(8.2)
Chlorpyrifos	1.26	0.486 ± 0.024	97.2/(4.9)	2.28 ± 0.14	91.2/(6.1)
Parathion-methyl	N.D	0.506 ± 0.031	101.2/(6.1)	2.36 ± 0.16	94.4/(6.8)

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