Compound

Linearity Range (µg/mL)

Correlation Coefficient R²

Linearity Equation

NDMA

1.02 - 15.30

0.9998

y = 4804.1x − 105.69

NMEA

1.02 - 15.54

0.9999

y = 6122.8x − 105.69

NDEA

1.04 - 15.53

0.9997

y = 4954x + 189.51

NDPA

1.04 - 15.53

0.9999

y = 10287x + 227.23

NDBA

1.05 - 15.75

0.9989

y = 11098x + 229.09

NPIP

1.03 - 15.45

0.9998

y = 5096.4x + 61.356

NPYR

1.02 - 15.30

0.9999

y = 12444x + 257.85