Simultaneous Determination of Ternary Mixture of Carboxin, Chlorpyrifos, and Tebuconazole Residues in Cabbage Samples Using Three Spectrophotometric Methods
Table 1
Calibration data for the determination of carboxin, chlorpyrifos, and tebuconazole by the proposed methods.
Methods
Compounds
λmax (nm)
Linear range (μg/mL)
Regression equation
r2
Sa
Sb
LOD (μg/mL)
LOQ (μg/mL)
DDRSD
CAR
242
1–30
Y = 0.159x − 0.0991
0.9999
0.1021
0.000638
0.178
0.541
CHL
236
1–50
Y = −0.0135X + 0.0026
0.9998
0.0015
0.000066
0.160
0.485
CHL
276
1–50
Y = 0.005X − 0.0012
0.9996
0.0007
0.000030
0.137
0.416
CHL
300
1–50
Y = −0.007X + 0.0016
0.9997
0.0009
0.000038
0.227
0.688
TEB
226
1–45
Y = −0.0237x + 0.0122
0.9997
0.0030
0.000123
0.109
0.332
SDRS
CAR
256
1–30
Y = 159.9X − 110.38
0.9999
9.9812
0.623717
0.153
0.463
CAR
258
1–30
Y = −161.84x + 112.3
0.9999
10.073
0.629442
0.206
0.626
CHL
290
1–50
Y = 42.148X + 28.653
0.9996
6.1303
0.261535
0.228
0.691
CHL
292
1–50
Y = −66.768X − 54.876
0.9995
10.632
0.453597
0.272
0.824
TEB
226
1–45
Y = 4.8322X − 0.9684
0.9996
0.7400
0.030216
0.127
0.385
TEB
228
1–45
Y = −5.2282X + 1.2232
0.9996
0.7585
0.030967
0.121
0.367
MCRS
CAR
306
1–30
Y = 83.991x + 15.029
0.9997
7.8579
0.491032
0.260
0.790
CHL
280
1–50
Y = 5.7606x − 2.4007
0.9997
0.7027
0.029981
0.159
0.483
TEB
240
1–45
Y = 45.877x + 142.7
0.9992
11.134
0.437175
0.205
0.621
Sa = standard error of the intercept, Sb = standard error of the slope, DDRSD : double divisor-ratio spectra derivative, SDRS : successive derivative of ratio spectra, and MCRS : mean centering of ratio spectra.
