Synthesis and characterization of cobalt nitroprusside nano particles: Application to sulfite sensing in food and water samples

Abstract

a b s t r a c tA new protocol toward the synthesis of cobalt nitroprusside (CoNP) coordination nanoparticles has been described based on drop-by-drop (DbD) method without using any additives. It was also prepared by sonication as well as bulk mixing methods for comparison purpose. The prepared complex was characterized by Infrared spectroscopy (FTIR), XRD and cyclicvoltammetry (CV) techniques. The CoNP complexes prepared by different synthetic approaches were used as modifier molecules to fabricate carbon paste electrodes (CPE's) toward electrochemical oxidation of sulfite. The experimental results revealed that the cobalt nitroprusside nanoparticles (n-CoNP) prepared by drop-by-drop method showed a considerable enhancement in the electrocatalytic activity when compared to its counterparts prepared by other approaches. Electrochemical behavior of the n-CoNP CPE was studied and used as an electrochemical sensor for the quantification of sulfite at trace level. It showed a linear response over the concentration range 1-5.9 × 10 −5 M and 2-8 × 10 −3 M of sulfite. The limit of detection and limit of quantification were found to be 0.4 × 10 −5 M and 2.29 × 10 −5 M respectively. The interference of various organic acids and inorganic ions commonly present in different food and water sample matrices were studied. The n-CoNP modified electrode was used for the quantification of sulfite in different food samples and the results were in good agreement with those obtained by the standard iodometric protocol.

Direct Preparation and Characterization of Copper Pentacyanonitrosylferrate Nanoparticles

“…Metallic nanoparticles (NPs) have attracted considerable attention on account of their intriguing properties and potential applications [1], due to their superior and advantageous functional properties for a wide range of technological applications, including catalysis, optics, microelectronics, and chemical, biological, and electrochemical sensors [1][2][3][4][5][6][7].…”

“…Recently, a new protocol toward the synthesis of cobalt nitroprusside (CoNP) coordination nanoparticles was described based on drop-by-drop (DbD) method without the use of any additives. It was also prepared by sonication as well as by bulk mixing methods for comparison purposes [2]. This paper proposes a new facile and direct synthesis route to obtain nanoparticles of copper pentacyanonitrosylferrate (NCuNP).…”

(Bio)Nanotechnology in Food Science—Food Packaging

“…Additional, nanosensors can be used also for sensing the quality of food ingredients as detector for pesticides and chemicals [ 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 ], unstable food ingredients [ 147 , 148 , 149 , 150 ] etc.…”

New analytical methodology for analysing S(IV) species at low pH solutions by one stage titration method (bichromatometry) with a clear colour change. Could potentially replace the state-of-art-method iodometry at low pH analysis due higher accuracy

“…For the SO 2 solubility studies on aqueous sulfuric acid other methods than titration have been proposed: from gas stream SO 2 can be detected by one-canal UV-analyzer [ 3 ], spectrophotometer [ 5 ], purging though a known concentration of H 2 O 2 solution [ 6 ] or scrubbing through sodium tetrachloromercute (II) and further analyzed with additional steps [ 7 ]. In addition, from the lean acid solutions use of enzymes [ 8 , 9 ] and electrochemical methods with screen-printed electrodes [ 10 , 11 ] or with nanoparticles [ 12 ] have been reported. Nevertheless, these methods are difficult or impossible to apply solutions at pH below 1 and many of them involve various experimental steps or expensive equipment.…”