Page 47 - Volume 3, Issue 2, July 2010
Basic HTML Version
© Benaki Phytopathological Institute
Anagnostopoulos
et al.
78
kg level and omethoate failed at both test-
ed levels. Therefore, a different technique
should be used for the determination of
these analytes. However, by using only a
GC with an ECD and a NPD detector and
two different columns for the confirmation
and quantification of the analytes, instead
of more expensive instruments (LC-MS-MS),
reduces the cost of the analysis and makes
it suitable to be used by a variety of labo-
ratories. Therefore, the method is suitable
for small routine laboratories of the private
or public sector where the cost of analysis is
very important. Although the limits are set
for the final product, monitoring of raw ma-
terials used in the production chain of cere-
al-based baby foods is also crucial, not only
for the public authorities responsible for the
monitoring of pesticide residues in food-
stuffs, but also for the food industry which
checks pesticide residues in their supplies.
Table 3.
Average recovery values and relative standard deviation for the compounts as de-
rived from the fortification experiments in both detection systems.
Analyte
Detector: ECD
Detector: NPD
Lower
fortification
level
(3 μg/kg)
Higher
fortification
level
(30 μg/kg)
Lower
fortification
level
(3 μg/kg)
Higher
fortification
level
(30 μg/kg)
Recovery
(%)
SD
R
(%)
Recovery
(%)
SD
R
(%)
Recovery
(%)
SD
R
(%)
Recovery
(%)
SD
R
(%)
aldrin
97.1 15.2 95.5
9.3
-
-
-
-
cadusafos
113.6 3.4 101.9 6.5 108.6 6.8 101.3 10.4
demeton-S-methyl
-
-
-
-
79.2
3.5 97.6 23.9
demeton-S-methyl sulfone
-
-
-
-
108.3 28.0 89.3 5.4
demeton-S-methyl sulfoxide
-
-
-
-
106.8 17.2 85.6 7.6
dieldrin
94.8 10.0 112.4 6.8
-
-
-
-
dimethoate
124.6 11.5 103.2 6.3
-
-
-
-
disulfoton
102.5 7.47 68.2 17.1 104.6 11.3 87.2 12.6
disulfoton-sulfone
110.4 7.2
89.6
3.7
95.2 16.0 80.4 11.4
disulfoton-sulfoxide
98.9 12.2 111.5 4.9 100.3 7.83 106.4 4.7
ethoprophos
97.6 6.45 80.7 13.9 91.1
8.8 93.3 12.2
fensulfothion
95.6 7.55 97.6
3.7 118.2 13.6 86.8 13.0
fensulfothion sulfone
-
-
-
-
95.8 10.1 78.3 7.6
fensulfothion-oxon
-
-
112.8 8.7
-
-
76.2 9.7
fensulfothion-oxon-sulfone
96.4 11.7 118.1 4.6
-
-
-
-
fipronil
93.4 7.59 113.5 14
-
-
-
-
fipronil-desulfinyl
118.8 10.7 87.0
3.3
-
-
-
-
heptachlor
103.5 14.3 100.4 9.6
-
-
-
-
heptachlor epoxid (trans)
106.8 10.9 108.3 7.2
-
-
-
-
hexachlorobenzene
104.2 16.1 87.0 10.7
-
-
-
-
nitrofen
111.0 6.9 99.6 15.4
-
-
-
-
omethoate
-
-
-
-
-
-
-
-
terbufos
97.4 7.52 99.9 10.4 88.2
5.7 107.6 13.72
terbufos-sulfone
110.9 13.7 113.7 9.3
-
-
-
-
terbufos-sulfoxide
-
-
-
-
-
-
90.0 11.3
