Ethylenediaminetetraacetic acid (EDTA) is a well-known agent for chelating metal ions as found in various applications, i.e. environmental controls, food and non-alcoholic-beverage additives, etc. High content of EDTA in foods and environments is of health and environmental concerns. In this work, graphene oxide (GO)/hydroxyapatite (HAp) composite synthesized by chemical approaches was used as an active material for detecting EDTA in phosphate buffered saline (PBS) via potentiometric methods. GO/HAp composite was deposited on gold electrode by a drop-dried deposition technique. Cyclic voltammetry (CV) results showed that GO/HAp composite offers better EDTA detection than graphene oxide modified gold electrode. In addition, amperometry of GO/HAp composite on gold electrode showed a good linear relationship between oxidation peak current and EDTA concentrations (0.5 to 9 µM) with the detection limit of 0.5 µM.
Keyword: Graphene oxide, Hydroxyapatite, Ethylenediaminetetraacetic Acid, Detection,