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Environmental degradation has been demonstrably linked to human health problems,including some types of cancers,vector-borne diseases,emerging animal to human disease transfer,nutritional deficits and respiratory illnesses.Heavy metals associated with platinum group metal pollution are one of the most serious environmental problems,which undermine global sustainability.For sustainable development to be achieved,links between the environment and development must be examined.To support the development and implementation of environmental monitoring programs,we need quantitative technologies for measuring heavy metals exposure and pollution levels in water.Many efforts have been made to develop portable sensors for monitoring heavy metals in the environment [1].Thick and thin film electrochemical sensors are interesting devices for in-field analysis because they can be miniaturised,are simple to operate and are reliable,plus they can be mass-produced and thus used as disposable devices.The coupling of these devices with stripping techniques allows the realisation of a portable system for heavy metal monitoring [2].In this work incorporation of bimetallic nanoparticles(graphene and antimony nanoparticles)into sensors leads to significant improvement in the performance of devices in terms of sensitivity,selectivity,detection capability and portability.Both the spectroscopic and voltammetric analysis of freshwater samples was evaluated and the results shows that voltammetric analysis was more sensitive than ICP-AES spectrometry in the determination of the Pt(Ⅱ)concentrations in the freshwater samples.Evaluation of the novel rGO-SbNPs sensor in the stripping voltammetry has shown a linear working range for concentration of platinum(Ⅱ)between 6.0 × 10-3-5.4 × 10-2 ?g/L with LOD of 6 × 10-3 ? g/L1,which is below the WHO guidelines for Pt(Ⅱ)in freshwater.