A Method to Determination of Lead Ions in Aqueous Samples: Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction Method Based on Solidification of Floating Organic Drop and Back-Extraction Followed by FAAS

Table 2

Analytical characteristics of the proposed method.

Analytical feature	Value
Enhancement factor (EF)	81
Limit of detection (LOD) (μg·L^−1) ()	1.9
Limit of quantitation (LOQ) (μg·L^−1) ()	6.4
Linear range (μg·L^−1)	10–500
Precision (%RSD) (, for 25 μg·L^−1 Pb^2+)	3.4