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 1

Tolerance limits of interfering ions in the determination of 50 μg·L⁻¹ of Pb²⁺.

M^a	[Pb^2+]/[M]
Na^+	>1 : 5000
Mg^2+	>1 : 5000
Fe^3+	1 : 500
Cd^2+	1 : 1500
NH4^+	>1 : 5000
Zn^2+	1 : 500
Co^2+	1 : 100
Cr^3+	1 : 1000
Ni^2+	1 : 100
SCN^-	1 : 2000
Mn^2+	1 : 500
CO3^2−	1 : 1000
CrO4^2−	1 : 2000
Cu^2+	1 : 500
Al^3+	1 : 100

^aInterfering ion.