A Highly Selective Analytical Method Based on Salt-Assisted Liquid-Liquid Extraction for Trace-Level Enrichment of Multiclass Pesticide Residues in Cow Milk for Quantitative Liquid Chromatographic Analysis
Table 2
Relative recovery (RR) values of the proposed method in the milk samples.
Sample
Spiked level
Analytes
THE
CYZ
CAR
ATZ
MET
AZO
PRZ
%RR (%RSD, n = 3)
PSM
Level 1
95.7 (2.6)
93.0 (4.9)
92.8 (4.3)
87.7 (7.3)
90.2 (5.5)
92.8 (6.1)
108.8 (3.3)
Level 2
93.3 (4.2)
94.2 (3.0)
104.6 (5.5)
92.3 (8.0)
87.5 (4.8)
89.7 (5.4)
96.7 (2.7)
PMM
Level 1
97.9 (7.3)
93.2 (4.6)
91.7 (4.6)
87.9 (7.0)
91.6 (4.1)
85.9 (4.6)
108.3 (8.9)
Level 2
92.9 (7.0)
94.3 (3.1)
97.5 (5.0)
91.3 (3.4)
90.0 (4.0)
88.5 (7.0)
92.9 (3.3)
RSM
Level 1
96.0 (7.8)
86.3 (8.9)
88.4 (11.4)
88.2 (8.4)
85.3 (10.3)
88.6 (5.2)
94.2 (11.3)
Level 2
97.1 (10.6)
91.6 (6.2)
97.0 (8.0)
92.5 (5.1)
92.8 (9.2)
87.1 (6.2)
89.5 (10.9)
PSM, pasteurized milk sample one; PMM, pasteurized milk sample two; and RSM, raw sululta milk sample. Level 1 : 10 μg/L for CAR; 15 μg/L for THE, CYZ, ATZ, and PRZ; 30 μg/L for AZO; 45 μg/L for MET. Level 2 : 100 μg/L for CAR; 130 μg/L for THE, CYZ, ATZ, and PRZ; 260 μg/L for AZO; 390 μg/L for MET.
