Integrated system for potentiometric stripping determinations

摘要: Abstract An automatic system for potentiometric stripping was designed and tested the determination of lead(II) cadmium(II) in 10 −3 –10 −6 M range. It consists solid-state integrated circuitry containing a chemically-sensitive field-effect transistor (CHEMFET) control switch. Flow solutions, application potentials during electrode preparation, plating periods data acquisition are controlled by cheap microprocessor. is shown that 200-μl samples concentration range mentioned above can be dealt with less than 2.5 min relative standard deviations below 10%. The detection limit at present restricted slow sampling rate microprocessor used. upper value usable limited maximum practical oxidant.