Liquid-Liquid Extraction/Low-Temperature Purification (LLE/LTP) Followed by Dispersive Solid-Phase Extraction (d-SPE) Cleanup for Multiresidue Analysis in Palm Oil by LC-QTOF-MS

Table 2

Mean recovery, repeatability (RSD_r), and intermediate precision (RSD_ip) of the method for the mixture of the compounds in palm oil spiked at different levels.

Pesticide	Concentration level (ng g^−1)	Mean rec ± RSDr (%)^a	Mean rec ± RSDip (%)^a
Dimethoate	25	73.5 ± 4.9	71.8 ± 6.5
	50	82.2 ± 10.3	84.4 ± 9.7
	100	80.7 ± 7.1	87.8 ± 11.2
Simazine	25	83.4 ± 3.2	89.6 ± 9.1
	50	104.6 ± 7.7	107.6 ± 9.8
	100	91.1 ± 5.8	110.5 ± 8.9
Carbaryl	25	77.2 ± 13.3	75.7 ± 6.2
	50	89.1 ± 8.0	87.3 ± 12.5
	100	93.4 ± 5.7	92.9 ± 9.6
Atrazine	25	73.3 ± 5.4	82.9 ± 8.5
	50	95.8 ± 8.8	105.9 ± 15.1
	100	87.2 ± 10.4	112.4 ± 10.2
Diuron	25	61.3 ± 8.1	58.5 ± 6.2
	50	64.7 ± 3.4	71.2 ± 8.8
	100	76.4 ± 6.4	73.4 ± 11.3
Terbuthylazine	25	71.8 ± 6.2	80.6 ± 7.3
	50	91.1 ± 7.9	96.6 ± 11.4
	100	85.3 ± 11.5	91.7 ± 13.5
Malathion	25	79.2 ± 5.8	74.4 ± 7.2
	50	109.4 ± 3.2	92.8 ± 10.3
	100	106.7 ± 10.2	93.5 ± 9.4

^a𝑛=9.