Novel magnetic nanoparticles as adsorbent in ultrasound-assisted micro-solid-phase extraction for rapid pre-concentration of some trace heavy metal ions in environmental water samples: desirability function

• Published in: Chemical papers Vol. 74; no. 4; pp. 1143 - 1159
• Main Authors: Nabavi, S. Nasrin, Sajjadi, S. Maryam, Lotfi, Zahra
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.04.2020; Springer Nature B.V
• Subjects: Adsorbents; Adsorption; Atomic absorption analysis; Biochemistry; Biotechnology; Cadmium; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Copper; Design of experiments; Design optimization; Distilled water; Drinking water; Heavy metals; Industrial Chemistry/Chemical Engineering; Ions; Lead; Magnetic properties; Materials Science; Medicinal Chemistry; Metal ions; Nanoparticles; Nickel; Original Paper; Silicon dioxide; Solid phases; Statistical methods; Titanium dioxide; Ultrasonic imaging; Ultrasound; Ultrasound-assisted micro-solid-phase extraction (US-µ-SPE) method; Environmental water samples; Heavy metal ions; Central composite design
• ISSN: 2585-7290; 0366-6352; 1336-9075
• DOI: 10.1007/s11696-019-00954-z

In this research, a simple, rapid, and ecofriendly magnetic nanoparticles (MNPs)-based ultrasound-assisted micro-solid-phase extraction (US-µ-SPE) method has been proposed for simultaneous determination of five heavy metal ions [Cu(Π), Ni(Π), Pb(Π), Co(Π), Cd(Π)] in environmental water samples. Here, CoO–Fe 2 O 3 @SiO 2 @TiO 2 NPs were synthesized as an efficient adsorbent with excellent adsorption capacity, high dispersion ability and super-magnetic property for the adsorption of the ions. The parameters influencing the extraction efficiency were evaluated and optimized by statistical experimental design. The pH of sample solution, sonication time, dosages of adsorbent, and the volume, concentration and type of elute are 6.50, 14.2 min, 5.5 mg; 300 µL, 2 mol L −1 of HNO 3 , respectively. Moreover, the reusability for MNPs was six times. The target ions were successfully quantified using a micro-sampling flame atomic absorption spectrometry (MS-FAAS) technique in five different real water samples: tap water, lake water, river water, well water and distilled water. For all studied metal ions, the proposed method provided high recoveries (94.6–103%), high R 2 (0.9993–0.9998), low LODs (0.03–0.18 µg L −1 ) and repeatability (RSD% = 1.49–3.59).