Abstract
A film carbon veil-based electrode (FCVE) modified with non-ionic surfactant Triton X-100 (TrX100) has been developed for nitrite determination. A new simple and producible technique of hot lamination (heat sealing) has been used for the FCVE manufacturing. The paper presents the findings of investigating the FCVE and the TrX100/FCVE by using voltammetry, chronoamperometry, and scanning electron microscopy. Modification of the electrode with TrX100 improves the hydrophilic property of its surface, which results in a larger electrode active area and higher sensitivity. Optimal conditions for nitrite determination with the use of the TrX100/FCVE have been identified. The linear range (LR) and the limit of detection (LOD) are 0.1–100 μM and 0.01 μM, respectively. The relative standard deviation (RSD) does not exceed 2.3%. High selectivity of the sensor ensures its successful application for the analysis of real samples (sausage products and natural water). The obtained results accord well with the results of the standard spectrophotometric method.
Highlights
Nitrous acid salts are common contaminants of environmental objects and some food products
The electrochemical behavior of nitrite on the film carbon veil-based electrode (FCVE) and modified FCVE was studied in the Britton–Robinson buffer (BRB) background electrolyte
At the same time no signals are observed on the cathodic branch of the cyclic voltammogram, which indicates irreversible oxidation of nitrite on the FCVE and Triton X-100 (TrX100)/FCVE
Summary
Nitrous acid salts (nitrites) are common contaminants of environmental objects (water, soil) and some food products. Sources of nitrite in the ecological environment are household wastes, animal wastes, atmospheric emissions from enterprises, as well as nitrogen-containing fertilizers used in agriculture to improve yields. Sodium nitrite/potassium nitrite (E250/E249) is one of the most commonly used food additives in food industry to preserve meat and fish products recognizable appearance. Nitrite accumulates in products of vegetable and animal origin and enters the human body with food. Nitrite belongs to toxic substances and can cause inorganic contamination to human health. Excessive nitrite in the blood vascular system can reduce the blood capacity to transport oxygen and cause oxygen deprivation [1]. Nitrite could interact with amides/amines to form harmful
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