Nano-alumina coated with sodium dodecyl sulfate and modified with 4-(2-Pyridylazo) resorcinol for extraction of heavy metals in different matrixes

摘要: Abstract A green, novel and efficient solid phase extraction method based on the use of nano-alumina (nano-Al 2 O 3 ) coated with sodium dodecyl sulfate (SDS) modified 4-(2-Pyridylazo) resorcinol (PAR) as a new adsorbent was developed for separation preconcentration trace amounts Ni, Pb, Cu Zn ions prior to determination by inductively coupled plasma-optical emission spectrometry (ICP-OES). Under optimum conditions (eluent: HNO , 4.0 mL, 3.0 mol L −1 ; adsorbent: 0.8 g nano-Al 40 mg SDS, 8.6 mg PAR; sample: pH 6, flow rate 2.0 mL min ), adsorption capacity -SDS-PAR, enrichment factors limits detection analytes were 8.7–12.9 mg g 125–250, 0.12–0.71 μg L respectively. The proposed presented excellent repeatability relative standard deviations less than 1.6% ( n  = 10), calculated calibration curves gave good level linearity correlation coefficient values between 0.989 0.999. Finally, feasibility evaluated in rice seed, apple juice, coriander, lettuce tap water samples.