A simple co-precipitation sorbent-based preconcentration method for the analysis of fungicides in water and juice samples by high-performance liquid chromatography coupled with photodiode array detection

Journal of Analytical Science and Technology

Table 1 Analytical performance of the proposed preconcentration method for standard fungicides in pure water

Analyte	Linearity (μg/L)	Linear equation	R²	LOD (μg/L)	LOQ (μg/L)	Intra-day precision^a (n = 4)		Inter-day precision^a (n = 4 × 3 days)		EF^b	ER^c (%)
Analyte	Linearity (μg/L)	Linear equation	R²	LOD (μg/L)	LOQ (μg/L)	Peak area	t_R	Peak area	t_R	EF^b	ER^c (%)
CBZ	0.3–200	y = 949.3x – 2516.2	0.9953	0.3	1.0	1.8 (3.8)	0.6(2.7)	3.3 (9.3)	2.7 (3.6)	11	42
TBZ	0.1–200	y = 2576.2x – 7813.2	0.9968	0.1	0.3	1.7 (2.2)	1.4(2.8)	5.5 (9.9)	2.7 (3.6)	18	68
FuBZ	0.1–200	y = 3849.3x – 10,437.0	0.9978	0.1	0.3	0.2 (2.5)	1.3(2.6)	4.8 (10.2)	2.6 (3.2)	12	46

^aPrecisions were evaluated and expressed as the %RSD of peak area and retention time (t_R) for the concentration of 50 and 20 μg/L (in the parentheses)
^bEnrichment factor (EF): ratio of the slopes of the calibration curves obtained with preconcentration (S_ex) and without preconcentration (S_o)
^cExtraction recovery: \([\mathrm{EF}\times \frac{{V}_{\mathrm{ex}}}{{V}_{o}}]\times 100\); where V_ex and V_o are volumes of extraction phase (~ 0.380 mL) and original sample phase (10.00 mL), respectively