Table 3.

LOD, LOQ, linear range, and regression equations for the 15 sulfonate analytes.

Analyte	LOD (ng/mL)	LOQ (ng/mL)	Linear range (ng/mL)	Regression equation with correlation coefficient (r)
Methyl methanesulfonate	10	15	15–150	y = 1083.9x + 11041 (r = 0.9987)
Ethyl methanesulfonate	10	15	15–150	y = 811.42x + 3743.2 (r = 0.9991)
Propyl methanesulfonate	15	40	40–200	y = 279.07x + 4104.8 (r = 0.9958)
Isopropyl methanesulfonate	10	15	15–150	y = 646.27x + 5004.1 (r = 0.9976)
Butyl methanesulfonate	10	12	12–150	y = 1330.4x + 2849.7 (r = 0.9985)
Methyl benzenesulfonate	1	2	2–400	y = 2067.7x − 208.46 (r = 0.9996)
Ethyl benzenesulfonate	1	2	2–400	y = 1414.6x − 203.62 (r = 0.9997)
Propyl benzenesulfonate	2	5	5–400	y = 865.35x + 547.21 (r = 0.9998)
Isopropyl benzenesulfonate	1.5	3	3–400	y = 1367.5x + 454.06 (r = 0.9998)
Butyl benzenesulfonate	1	1.5	1.5–400	y = 2849.6x − 706.01 (r = 0.9997)
Methyl p-toluenesulfonate	0.5	1.5	1.5–100	y = 1719.3x + 505.87 (r = 0.9995)
Ethyl p-toluenesulfonate	1	2	2–100	y = 881.38x − 234.18 (r = 0.9999)
Propyl p-toluenesulfonate	1	2	2–100	y = 546.8x + 219.39 (r = 0.9995)
Isopropyl p-toluenesulfonate	1	2	2–100	y = 1144x − 467.86 (r = 0.9995)
Butyl p-toluenesulfonate	0.5	1.5	1.5–100	y = 1646.6x + 74.082 (r = 0.9998)