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

Table 2

Equations of linear correlation, correlation coefficients, and method detection limits (LOD) of OPEs.

Analyte	Linear regression	Correlation coefficient	LOD (µg/L)
TEP	𝑦=0.0122𝑥−0.0148	0.9993	0.07
TCEP	𝑦=0.0006𝑥−0.0011	0.9990	0.07
TCPP	𝑦=0.0032𝑥−0.0027	0.9992	0.04
TBP	𝑦=0.0647𝑥−0.0094	0.9995	0.02
TBEP	𝑦=0.0122𝑥−0.0293	0.9982	0.02
TPhP	𝑦=0.0097𝑥−0.0003	0.9998	0.03
o-TTP	𝑦=0.0292𝑥−0.0252	0.9991	0.02
TEHP	𝑦=0.0219𝑥−0.0148	0.9993	0.02

𝑦: peak area of analytes/peak area of TBP-d27; 𝑥: mass concentration, µg/L.