ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Electrochemical determination of dinitramine in water samples using a pencil graphite electrode modified with poly-l-cystein-gold nanoparticle

Fatemeh Amouzad and Kobra Zarei

School of Chemistry, Damghan University, Damghan, Iran

E-mail: zarei@du.ac.ir

Received: 17 February 2020  Accepted: 10 August 2020

Abstract:

In this work, the electrochemical determination of dinitramine was performed by adsorptive differential pulse voltammetry (AdDPV) as a sensitive method and using a pencil graphite electrode modified with poly-l-cystein-gold nanoparticles (PLC-AuNPs/PGE). The field emission scanning electron microscopy (FESEM), electrochemical impedance spectroscopy (EIS), and energy-dispersive X-ray spectroscopy (EDX) were used to investigate the electrochemical characteristics of the electrodes. After optimization of different parameters, including number of cycles and scan rate for polymerization of l-cystein and entrapment of AuNPs, pH, adsorptive time, adsorptive potential of dinitramine and step potential (E_step) in the AdDPV method, the signal of oxidation of dinitramine was obtained which linearity increased over the concentration range from 1.0 × 10^–9 to 1.0 × 10^–8 M and 1.0 × 10^–8 to 5 × 10^–6 M. The detection limit was obtained as 1.83 × 10^–10 M and relative standard deviation was calculated as 2.5% for determination of 2.0 μM dinitramine. The proposed method was used to determine dinitramine in tap (drinking) and river waters. This was a new strategy with excellent sensitivity, reproducibility and stability to measure dinitramine.

Keywords: Poly-l-cystein; Gold nanoparticles; Dinitramine; Pesticides; Adsorptive differential pulse voltammetry

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01310-2

Chemical Papers 75 (2) 493–501 (2021)