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

<div>Effect of the salt type. Extraction conditions: sample size, 5 mL; extraction solvent, acetonitrile; extraction solvent volume; 1000 <i>μ</i>L; amount of each salt added, 30% (m/v); pH of solution, 7.0; vortex agitation time, 1 min; centrifugation speed, 4000 rpm for 5 min; <i>n</i> = 6.</div>

International Journal of Analytical Chemistry

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Figure 4

Figure 4: 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 

Figure 4 | 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 