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

Table 1

Adsorbance of imprinted polymer nanomicrospheres of three group (A, C-added magnesium chloride, B-no addition of magnesium chloride).

Adsorbant	Treated group	Concentration (mg·L^−1)	0.04	0.2	0.4	1.0	2.0	4.0
		Pesticides	Actual adsorbance (μg·g^−1)
Imprinted polymer microspheres	A	Tolclofos-methyl	7.2	36.1	77.3	140.8	162.4	173.2
		Chlorpyrifos	7.4	33.4	53.2	123.8	137.4	143.5
		Parathion-methyl	6.7	37.6	61.0	147.2	158.3	165.9
		Phoxim	7.7	38.9	48.1	118.6	147.2	161.3
	B	Tolclofos-methyl	4.6	28.3	43.1	107.3	122.9	129.4
		Chlorpyrifos	4.4	21.5	47.6	76.4	87.3	116.2
		Parathion-methyl	5.3	22.6	40.4	90.7	127.4	122.8
		Phoxim	4.2	25.2	44.7	82.7	96.4	111.7
Nonimprinted polymers microspheres	C	Tolclofos-methyl	6.6	18.0	32.3	47.2	50.7	51.3
		Chlorpyrifos	4.4	22.0	32.3	45.3	54.0	57.7
		Parathion-methyl	4.2	19.7	32.7	51.3	59.0	63.1
		Phoxim	5.1	23.3	29.0	39.2	49.3	68.2
Theoretical adsorbance (μg·g^−1)			8.0	40.0	80.0	200.0	400.0	800.0

MIPs: molecularly imprinted polymers; NIPs: molecularly nonimprinted polymers.