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

Table 1

MS parameters of OPE compounds and TBP-d27 internal standard.

Compounds	Precursor ion (𝑚/𝑧)	Daughter ion (𝑚/𝑧)	Cone voltage (V)	Collision energy (eV)
TEP	183.0	99.0^a	18	18
		127.0	18	12
TCEP	286.9	99.0^a	22	26
		161.1	22	16
TCPP	329.1	99.0^a	16	22
		175.0	16	14
TBP	267.1	99.0^a	18	18
		155.1	18	10
TBEP	399.3	299.2^a	26	12
		199.1	26	16
TPhP	327.0	152.1^a	40	32
		77.0	40	36
o-TTP	369.3	91.0^a	46	32
		165.0	46	42
TEHP	435.4	99.0^a	16	14
		323.0	16	6
TBP-d27	294.3	101.9	20	18

aTransitions for quantification.