Table 2 Degradation intermediates of [Cnmim][BF4] detected by GC–MS and IC.

From: Degradation of 1-alkyl-3-methylimidazolium tetrafluoroborate in an ultrasonic zero-valent zinc and activated carbon micro-electrolysis system

IL

Intermediate

Retention time (min)

Main fragment (m/z)

Molecular weight

[C2mim][BF4]

e2

10.16

58

130

i

4.02

59

59

g2

4.68

73

73

j NO3–

   

[C4mim][BF4]

d4

12.55

58,30,186

186

i

3.99

59,30

59

g4

7.17

58,30,101

101

j NO3–

   

[C6mim][BF4]

a6

17.50

165,198

198

b6

14.38

98,182

182

c6

15.27

56,142

212

d6

14.89

58

214

f6

10.42

58

157

g6

10.18

58

129

j NO3–

   

[C8mim][BF4]

a8 View full size image

19.59

193,226

226

b8 View full size image

16.60

98,210

210

c8

17.47

142

240

d8 View full size image

17.11

60

242

f8

13.09

74

185

g8

12.86

58

157

j NO3–

   

[C10mim][BF4]

a10 View full size image

21.58

221,254

254

b10 View full size image

18.76

98,238

238

c10 View full size image

19.50

142

268

d10 View full size image

19.16

60

270

f10 View full size image

15.51

74

213

g10 View full size image

15.31

59

185

h10 View full size image

11.72

99

183

j NO3–

   
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