18 2
2 0 1 2 0 6 ANALYSIS AND TESTING TECHNOLOGY AND INSTRUMENTS
Volume 18 Number 2
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June 2012
111 ~ 113
2012 - 05 - 02 2012 - 05 - 23.
“ ”.
1980 - . miaojianjun1998@ 126. com
/
1 2
1. 226006 2. 210032
/ .
α
- 、
β
-
0. 200 ~ 10. 0
μ
g /L 0. 02、0. 02 0. 03
μ
g /kg
RSD 3. 6% ~ 4. 3% 83. 6% ~ 86. 4% .
.
α
-
β
- /
O657. 33 B 1006-3757 2012 02-0111-03
α
-
β
- 2 1
. 、 、
.
1
.
/ GC /EC D /
GC /MS - EI
2 - 7
. ECD
GC /MS - EI
1
α
-
β
-
Fig. 1 Structural formulas of
α
- endosulfan
and
β
- endosulfan
1
μ
g /L .
/ GC /MS - NCI
100 ~
1 000
8
.
/
.
1
1. 1
ASE350
GPC LCTech
GC 6890 - MS 5973 /
.
100 mg / L
α
- 、
β
-
、 、
、 .
1. 2
1. 2. 1 ASE
、 150
μ
m
. 30 g
34 mL ASE
18
50 mL .
ASE 1500 psi
100 ℃ 5 min 5 min
50% 1 / V / V = 1∶ 1 .
1. 2. 2 GPC
ASE
6 mL GPC .
GPC 400 mm × 25 mm Bio Beads
SX - 3 5 mL
5 mL/ min . 1200 s ~ 1900 s
5 mL 1. 5 mL GC / MS .
1. 3 GC /MS
DB - 5MS 30 m × 0. 25 mm ×
1. 0
μ
m 110 ℃ 30 ℃ / min
260 ℃ 10 ℃ /min 300 ℃
3 min 250 ℃ 280 ℃
1
μ
L.
280 ℃ 4 min.
SIM
1.
1
Table 1 Target ions of analytes
CAS
α
- 959 - 98 - 8 406 408 404 372
β
- 33213 - 65 - 9 406 408 404 372
1031 - 07 - 8 386 384 352
2
2. 1
1. 00
μ
g /L SIM
2. 8 min
.
2
Fig. 2 Chromatogram of endosulfan and Endosulfan
sulfate standards
2. 2
α
- 、
β
-
0. 2、0. 5、1. 0、2. 0、5. 0、10. 0
μ
g /L .
2.
2. 3
.
5. 0
μ
g /kg . ASE GPC
5
2. R 83. 6% ~
86. 4% RSD 3. 6% ~ 4. 3% .
2. 4
0. 5
μ
g /kg
5
MDL 5
S 3
2 0. 1
μ
g /L ECD
9
.
2 、
Table 2 Standard curves method detection limits precisions and spike recovery test results
r
5. 0
μ
g /kg
1 2 3 4 5 R /% RSD/%
MDL
/
μ
g /kg
α
-
y = 1. 29 × 10
3
x - 16
0. 999 7 4. 33 4. 31 3. 93 4. 15 4. 33 84. 2 4. 1 0. 02
β
-
y = 1. 54 × 10
3
x - 38
0. 999 5 4. 45 4. 26 4. 02 4. 15 4. 02 83. 6 4. 3 0. 02
y = 1. 13 × 10
3
x - 5
0. 998 8 4. 54 4. 42 4. 18 4. 27 4. 20 86. 4 3. 6 0. 03
211
2 /
2. 5
2
. 30g ASE
GPC 1. 0 mL GC /MS
5
μ
g /L
3.
MS
. 84%
.
3
Table 3 Detection results of real soil samples
1
ρ
/
μ
g /L
ρ
/
μ
g /L /%
2
ρ
/
μ
g /L
ρ
/
μ
g /L /%
α
- 3. 62 7. 93 86. 2 2. 42 6. 65 84. 6
β
- 1. 45 5. 69 84. 7 1. 57 5. 83 85. 2
2. 84 7. 23 87. 8 1. 98 6. 40 88. 3
3
/
.
.
1 .
J . 1996 4 1 41 - 49.
2 . - -
J .
2010 29 2 19 - 22.
3 . GC/ MS
J . 2003 24 123 -124.
4 . - GC /MS
16 J .
2010 22 6 51 - 54.
5 .
J . 2009
21 6 39 - 43.
6 .
J . 2004 23
4 168 - 172.
7 . 、 、
J . 2009 48 7 515 - 518.
8 .
- -
J . 2010 29 3 376 - 382.
9 .
J . 2007 24 6
1084 - 1089.
Determination of Endosulfan and Its Metabolite in Soil Using Gas
Chromatography - mass Spectrometry with Negative Ion Chemical Ionization
MIAO Jian - jun
1
WANG Yan - guang
2
1. Environmental Monitoring Center of Nantong Nantong 226006 China 2. Jinling High School Nanjing 210008 China
Abstract A gas chromatography - negative ion chemical ionization mass spectrometry GC /MS - NCI was developed for the rapid
determination of endosulfans and its metabolite in soil samples. The soil sample was pretreated with n - hexane and then analyzed by
GC / MS - NCI . External standard calibration was used the selective ions of endosulfan and endosulfan sulfate were m / z 406 408
404 372 and m /z 386 384 352 respectively. The detection limit was 0. 02 ~ 0. 03
μ
g /kg. The recoveries were in the range of 83.
6% ~ 86. 4% with the relative standard deviations less than 5% . The method proposed is efficient accurate and sensitive which
could meet the requirements for determining endosulfans in soil.
Key words
α
- endosulfan
β
- endosulfan endosulfan sulfate gas chromatography - negative ion chemical ionization mass
spectrometry GC / MS - NCI soil
Classifying number
O657. 33
311