Analysis of Five Earthy-Musty Odorants in Environmental Water by HS-SPME/GC-MS

Table 2

The parameters of the MS scan function (SIM mode) for the determination of analytes.

Compounds	𝑡𝑅 (min)	Segment (min)	Selected ions	𝑅^b	RSD% (𝑛=7)	LOD^e (ng L^−1)
DMTS	13.669	12.1–14.0	126^a, 79,111	0.9998	9.9^c, 12.1^d	1.3
IBMP	18.003	17.0–18.1	124^a, 94,151	—	—	0.1
2-MIB	18.542	18.1–18.7	107^a, 95,135	0.9995	4.9^c, 5.9^d	0.5
β-Cyclocitral	18.991	18.7–20.0	137^a, 152,123	0.9990	4.4^c, 6.7^d	0.2
GSM	22.102	20.0–22.3	112^a, 126,97	0.9990	8.2^c, 8.9^d	0.2
β-Ionone	22.596	22.3–25.0	177^a, 91,135	0.9811	7.1^c, 9.8^d	0.4

^aQuantitative ions (𝑚/𝑧).
^bCalibration curves with compounds concentration: 5, 10, 20, 50, and 100 ng L⁻¹.
^cRSD: relative standard deviation, using IBMP as the internal standard. Compound concentration: 20 ng L⁻¹.
^dWithout internal standard. Compound concentration: 20 ng L⁻¹.
^eLOD: limit of detection was calculated on the basis of 𝑆/𝑁 = 3, this value is a mathematical approximation.