Chemistry Reference
In-Depth Information
160
140
120
100
80
60
40
20
0
0.05mg/kg
0.5mg/kg
1mg/kg
Figure 6.
Recoveries fortified in Orange (n=5 at each level).
The recoveries and coefficients of variation of triazoles from fortified cabbage samples are
shown in Table 3 and Fig. 7. Samples were spiked at 0.05mg/kg, 0.5mg/kg and 1mg/kg. The
recoveries for 9 triazoles were within the acceptable range for 1 mg/kg fortification levels.
They ranged between 98-120% (CV of 2.6% to 7.1%). Recoveries obtained at 0.5 mg/kg were
in the range of 76-100% with CV of 4.1 to 18.9%). The recoveries for cyproconazole and
fenbuconazole at 0.5 mg/kg were in the acceptable range but CV% was out of range.
Recoveries for cabbage spiked at 0.05mg/kg were between 53-98%. A lower recovery was
obtained for cyproconazole and tebuconazole while fenbuconazole was almost all lost
(0.7%) and the CV was also so high (149.9%). The overall average recovery was 91%.
Cabbage
1.0 mg kg
1
0.5 mg kg
-1
0.05 mg kg
1
Triadimenol
115.8 (2.6)
99.0 (4.1)
88.7 (2.5)
Cyproconazole
98.6 (7.1)
76.0 (16.8)
53.5 (13.0)
Myclobutanil
119.9 (2.7)
98.8 (6.3)
92.1 (4.1)
Triadimefon
112.9 (6.0)
100.3 (5.1)
101.9 (2.3)
Tebuconazole
98.9 (3.4)
77.8 (10.0)
58.9 (6.9)
Fenbuconazole
101.8 (6.1)
76.5 (18.9)
0.7 (149.4)
Hexaconazole
115.6 (2.7)
94.2 (8.3)
71.5 (3.8)
Propiconazole
113.15 (4.3)
96.6 (4.8)
96.4 (3.6)
Difenoconazole
112.4 (5.5)
95.6 (8.1)
98.3 (9.9)
Table 3.
Recovery of Triazoles in cabbage (n=5)
The recovery results obtained from spiked tomato at different levels was between 66-144%
(see Table 4). The CV for all compounds at different fortification levels were in the range of
2.6 - 11.9% and met the CV acceptable range except for fenbuconazole (16.9%). The recovery
for propiconazole at all the 3 concentrations of 0.05 mg/kg and 0.5 mg/kg spiked did not
meet the acceptance limit but the CV's met the acceptable limit. The overall average
recovery was 105.3%.
