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A multistep paper-based analytical device (mPAD) was designed and applied to the voltammetric determination of total inorganic arsenic. The electrodeposition of gold nanoparticles on a boron-doped diamond (AuNP/BDD) electrode and the determination of total inorganic arsenic is accomplished with a single device. Total inorganic arsenic can be determined by first reducing As(V) to As(III) using thiosulfate...
A novel, highly selective and sensitive paper-based colorimetric sensor for trace determination of copper (Cu 2+ ) ions was developed. The measurement is based on the catalytic etching of silver nanoplates (AgNPls) by thiosulfate (S 2 O 32− ). Upon the addition of Cu 2+ to the ammonium buffer at pH 11, the absorption peak intensity of AuNPls/S 2 O 3...
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