Determination of Nitrite in Food by Carbon Paste Electrode Modified with Ni/Mg/Fe Ternary LDH

doi:10.7506/spkx1002-6630-201312023

Abstract

Abstract:

Hydrotalcite-like compounds are layered double hydroxide composite metal compounds (LDHs), which show good
electrical adsorption and electrocatalytic properties. In this study Ni/Mg/Fe ternary LDH was synthesized by coprecipitation
and mixed with carbon paste to prepare carbon paste electrodes for detection of nitrite in food. The results showed that the
synthesized LDH had obvious adsorption and catalytic oxidation effects on nitrite iron and the electrochemical performance
of the chemically modified carbon paste electrode was greatly improved. There was a good linear relationship (correlation
coefficient was higher than 0.998) over the concentration range of 5－700 μmol/L and the minimum detection limit was
0.49 μmol/L. The conditions of scanning potential, scanning speed, accumulation time, pH and the amount of modifier were
also optimized to further improve the detection sensitivity. The method was further applied to analyze food samples, and the
average recovery rates were (100 ± 10)%, which showed good detection peformance. Compared with other detection methods,
this method showed the advantages of high stability, reproducibility and sensitivity, rapid response, wide liner range, little
interference and simple instruments. The new electrode can be used in pratice with good application prospects.

Key words: ternary LDH, carbon paste electrode, chemically modified electrode, nitrite

SHI Feng，LI Kan，JIA Jin-ping*，WANG Ya-lin. Determination of Nitrite in Food by Carbon Paste Electrode Modified with Ni/Mg/Fe Ternary LDH[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201312023.

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Determination of Nitrite in Food by Carbon Paste Electrode Modified with Ni/Mg/Fe Ternary LDH

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