Simultaneous Determination of Ternary Mixture of Carboxin, Chlorpyrifos, and Tebuconazole Residues in Cabbage Samples Using Three Spectrophotometric Methods

Table 2

Accuracy and precision for simultaneous determination of carboxin, chlorpyrifos, and tebuconazole in the ternary mixture by the proposed methods.

Compound	Methods of analysis	Concentration (μg/mL)	% recovery	%RSD
Carboxin	Double divisor-ratio spectra derivative at 242 nm	1.0	95.03	4.30
		15.0	98.49	1.57
		30.0	97.50	0.89
	Successive derivative ratio spectra at 256 nm	1.0	96.53	3.95
		15.0	99.14	1.84
		30.0	100.42	0.62
	Successive derivative ratio spectra at 258 nm	1.0	96.70	4.63
		15.0	99.55	0.44
		30.0	100.81	1.07
	Mean centering of ratio spectra at 306 nm	1.0	95.72	3.55
		15.0	100.37	1.30
		30.0	99.56	1.54
Chlorpyrifos	Double divisor-ratio spectra derivative at 236 nm	1.0	104.44	4.34
		30.0	100.88	0.95
		50.0	99.67	1.61
	Double divisor-ratio spectra derivative at 276 nm	1.0	95.2	4.26
		30.0	98.27	2.23
		50.0	97.04	1.33
	Double divisor-ratio spectra derivative at 300 nm	1.0	96.0	4.45
		30.0	102.28	1.21
		50.0	99.94	0.55
	Successive derivative ratio spectra at 290 nm	1.0	102.84	4.05
		30.0	99.28	0.85
		50.0	101.61	1.78
	Successive derivative ratio spectra at 292 nm	1.0	104.13	4.43
		30.0	101.20	2.38
		50.0	100.47	0.89
	Mean centering of ratio spectra at 280 nm	1.0	104.16	4.81
		30.0	102.83	2.32
		50.0	99.23	1.68
Tebuconazole	Double divisor-ratio spectra derivative at 226 nm	1.0	104.89	4.69
		20.0	99.2	1.82
		45.0	98.19	1.02
	Successive derivative ratio spectra at 226 nm	1.0	95.78	4.57
		20.0	97.02	1.59
		45.0	101.16	1.64
	Successive derivative ratio spectra at 228 nm	1.0	95.31	4.45
		20.0	101.01	1.74
		45.0	99.21	0.71
	Mean centering of ratio spectra at 240 nm	1.0	95.60	4.32
		20.0	102.58	0.80
		45.0	99.55	1.48