Anodic stripping voltammetry valves

Improvements on a computer-controlled instrument for performing trace-metal analysis by anodic stripping voltammetry are presented and discussed. The ease of operation of the instrument has been improved by the use of carbon-disc electrodes and spool-type Teflon valves. The device has been used to measure Zn, Cd, Pb, and Cu in estuarine waters recently an attempt was made to measure Cu in surface oceanic waters. Although the sensitivity and accuracy of the instrument appear insufficient for the measurement of Cu in oceanic surface waters, the approach appears promising for future work. 

Y. Wang, Z. Liu, G. Yao, P. Zhu, X. Hu, Q. Xu, C. Yang, Determination of cadmium with a sequential injection lab-on-valve by anodic stripping voltammetry using a nafion coated bismuth film electrode, Talanta 80 (2010) 1959-1963. 

Figure 6 shows a scheme of the sequential injection anodic stripping voltammetry system (SI-ASV) used for inorganic arsenic speciation in water samples. The system consisted of a MicroBu 2030 multisyringe burette with programmable speed (CS, Crison, Spain) used to aspire and dispense the reagent solutions, an eight-way selection valve (SV, Crison), a home-made tubular electrochemical cell (D), and a mixer chamber (MC). 

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