期刊
NEW JOURNAL OF CHEMISTRY
卷 42, 期 24, 页码 19537-19547出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj03501f
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资金
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ) [E-26/102.971/2012, E-26/111.407/2013]
A handcrafted, low cost sustainable electrochemical sensor based on graphite/PLA was developed and applied for the simultaneous quantification of Pb2+ and Cd2+ in jewelry (metallic ores) on the basis of square-wave anodic stripping voltammetry (SWASV). The proposed electrode was characterized by different complementary strategies such as cyclic voltammetry (CV), thermogravimetric analysis (TGA), Raman spectroscopy, X-ray Micro Computed Tomography (mu CT), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Experimental results showed that the developed electrode exhibits excellent electrochemical performance, with accurate and well-resolved voltammetric responses for the analytes assessed. Under optimized conditions, experiments led to linear ranges from 0.9 to 35.0 mu g L-1 for Cd2+, and from 1.2 to 35.0 mu g L-1 for Pb2+, with detection limits estimated as 0.3 mu g L-1 and 0.4 mu g L-1, respectively. The fabricated electrode was successfully applied to the fast simultaneous quantification of Pb2+ and Cd2+ in jewelry samples and the findings were in agreement to those reached by graphite furnace atomic absorption spectrometry (GF AAS).
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