Dispersive Liquid-Liquid Microextraction Combined with Ultrahigh Performance Liquid Chromatography/Tandem Mass Spectrometry for Determination of Organophosphate Esters in Aqueous Samples

Table 3

Recoveries and precisions of OPEs.

Analyte	Spiked (µg/L)	Recovery (%)	RSD (%, 𝑛=6)	Interday variability (%, 𝑛=5)
TEP	0.3, 0.6, 3.0	48.7, 52.8, 58.3	6.9, 6.2, 6.9	6.8, 5.6, 5.3
TCEP	0.3, 0.6, 3.0	85.9, 86.8, 91.4	9.3, 8.1, 5.9	12.3, 10.2, 5.8
TCPP	0.2, 0.4, 2.0	107, 94.2, 95.6	7.3, 5.3, 4.1	7.0, 5.7, 4.3
TBP	0.1, 0.2, 1.0	90.8, 86.4, 89.4	3.9, 3.0, 4.3	2.6, 2.8, 3.0
TBEP	0.1, 0.2, 1.0	113, 95.6, 102	7.4, 3.2, 3.8	7.5, 5.6, 3.9
TPhP	0.1, 0.2, 1.0	101, 97.2, 95.8	6.5, 5.7, 4.5	4.6, 4.5, 3.8
o-TTP	0.1, 0.2, 1.0	103, 94.6, 98.8	6.9, 3.7, 3.2	3.2, 4.5, 6.4
TEHP	0.1, 0.2, 1.0	107, 99.8, 102	5.0, 3.0, 3.6	4.3, 3.3, 2.7