Samplea
Temperature
(°C)

Peak
Area
at ± 9.2 min.b

Peak
Area
At ± 12.0 min.b

%
Area of
2-M-2-B of totalc

Peak
Area
At ± 15.2 min.b

2-MIB
Area
m/z 95d

GSM
Area
m/z 112d

2-MIB
Assay
(ng/L)e

2-MIB
Accuracy
(%)f

GSM
Assay
(ng/L)e

GSM
Accuracy
(%)f

20

ndg

nd

 

nd

nd

nd

 

 

 

 

30

nd

nd

 

nd

nd

nd

 

 

 

 

40

20 723

  45 073

31

  49 310

  25 845

  35 975

1.44

 28.80

1.13

  22.60

50

28 201

  87 730

24

103 403

  54 193

  75 586

3.01

 60.20

2.37

  47.40

60

50 705

160 373

24

188 463

  93 474

138 392

5.19

103.80

4.34

  86.80

70

52 297

221 145

19

257 964

123 511

185 826

6.85

137.00

5.82

116.40

80

56 667

304 435

16

356 702

174 907

256 176

9.71

194.20

8.02

160.40

Mean

 

 

23

 

 

 

 

 

 

 

SD

 

 

  6

 

 

 

 

 

 

 

RSD%

 

 

25.08

 

 

 

 

 

 

 

a5 ng/L composite of 2-MIB/GSM in MQ water
b From the TIC, in SIM mode, by manual integration
c = [(Area of 2-M-2-B/(area of 2-M-2-B + area of 2-MIB)]100, using TIC responses
d from SIM chromatogram, at respective tr; extracted ions m/z 95, 107 (for 2-M-2-B, 2-MIB) and m/z 112 (for GSM)
e By calibration, using the normal composite standards of 2-MIB/GSM in MQ water
f By recovery
g Not detected
Table 6: Effect of sample purge temperature on sensitivity at low concentration.
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