Potentiometric stripping

METHOD DEVELOPMENT FOR THE POTENTIOMETRIC STRIPPING ANALYSIS OF SOLUBLE COPPER IN DENTAL MATERIALS... 

Other versions of shipping analysis, including potentiometric stripping, adsorptive shipping, and cathodic stripping schemes, have been developed to further expand its scope and power. 

Potentiometric stripping analysis (PSA), known also as stripping potenhometry, differs from ASV in the method used for stripping the amalgamated metals (22). hi this case, the potentiostatic control is disconnected following the preconcentration, and the concentrated metals are reoxidized by an oxidizing agent [such as O2 or Hg(II)] that is present in the solution ... 

Describe clearly the principle and operation of potentiometric stripping analysis (PSA). How it is differed from anodic stripping voltammetry (ASV) What is the quantitative signal What is its advantage over ASV ... 

Potential of zero charge, 20, 23, 25, 66 Potential scanning detector, 92 Potential step, 7, 42, 60 Potential window, 107, 108 Potentiometry, 2, 140 Potentiometric stripping analysis, 79 Potentiostat, 104, 105 Preconcentrating surfaces, 121 Preconcentration step, 121 Pretreatment, 110, 116 Pulsed amperometric detection, 92 Pulse voltammetry, 67... 

Fig. 6.5 Schematic representation of a bioelectronic protocol for detection of DNA hybridization (A) binding of the target to magnetic beads (B) hybridization with CdS-labeled probe (C) dissolution of CdS tag (D) potentiometric stripping detection at a mercury-film electrode. (Reprinted from [136], Copyright 2009, with permission from Elsevier)...

Fig. 3.67. E-t curves of potentiometric stripping analysis (Psa) and its derivative (Dpsa) for 0.1 fiM Zn, Pb and Cd in 0.1 M NaCl (chemical stripping).

Wang et al. [295] used a remote electrode, operated in the potentiometric stripping mode, for the continuous onboard measurement of copper distribution patterns in San Diego Bay (CA, USA). 

Potentiometric stripping analysis has been applied by Sheffrin and Williams [320] to the measurement of copper in seawater at environmental pH. The advantage of this technique is that it can be used to specifically measure the biologically active labile copper species in seawater samples at desired pH values. The method was applied to seawater samples that had passed a 0.45 pm Millipore filter. Samples were studied both at high and at low pH values. 

Table 5.4. Analysis of poor quality seawater by potentiometric stripping analysis and atomic absorption spectroscopy and good quality seawater by potentiometric stripping analysis... 

Hua et al. [507] described an automated method for determination of molybdenum in seawater by means of constant-current reduction of the adsorbed 8-quinolinol complex in a computerised flow potentiometric stripping analyser. The complex was adsorbed onto a molybdenum film electrode at -0.2 V and stripped at -0.42 V. The authors report measuring molybdenum at 8.9 1.3 xg/l in reference seawater NASS-1, with a certified value of 11.5 1.9 xg/l. 

Jagner et al. [802] used this technique to determine zinc, cadmium, lead, and copper in seawater. Their method includes computer control of the potentiometric stripping technique. They compared their results with those obtained by solvent extraction-AAS and showed that the computer-controlled potentiometric stripping technique is more sensitive, and has advantages over ASV. Computer control makes deoxygenation of the sample unnecessary. 

Water samples from the Arctic Sea were analysed by the potentiometric stripping technique. Lead (II) and cadmium (II) were determined after preelectrolysis for 32 min at -1.1 V with respect to Ag/AgCl the detection limits were 0.06 and 0.04 nmol/1, respectively. Zinc (II) was determined after the ad-... 

Drabek et al. [803] applied potentiometric stripping analysis to the determination of lead, cadmium, and zinc in seawater. The precision was evaluated by several duplicate determinations and was found to be in the range 5-16% relative, depending on the concentration level. The accuracy of the method was evaluated by comparison with other conventional methods, e.g., AAS and ASV, and good agreement between the methods was found. 

Eskilsson et al. [868] have described equipment for automated determination of traces of cobalt and nickel by potentiometric stripping analysis, which used a freshly prepared mercury film on a glassy carbon support as the working... 

Recorder potentiometric strip chart, 0-1 millivolt, 1 second F.S. response, with integrator... 

For many years conventional potentiometric (strip chart) recorders have been the standard recording device for gas chroma-... 

Potentiometric stripping analysis (PSA) is another attractive version of stripping analysis [7]. The preconcentration step in PSA is the same as for ASV that is, the metal is electrolytically deposited (via reduction) onto the mercury electrode (usually a film). The stripping, however, is done by chemical oxidation, for example, with oxygen or mercuric ions present in the solution ... 

Figure 24.4 Potentiometric stripping analysis of a solution containing 1.5 x 10 6 M Zn2+, Cd2+, Pb2+, and Cu2+, using 3-min deposition and mercury as an oxidant.

Figure 24.9 Schematic of a computerized flow potentiometric stripping analyzer. [From Ref. 63, with permission.]...

Electrochemical measurements have been developed by using different electrochemical techniques (differential pulse voltammetry (DPV), cyclic voltametry (CV), potentiometric stripping analysis (PSA), square wave voltammetry (SWV), adsorptive stripping transfer voltammetry (ASTV), etc.). The abbreviations given in covalent attachment of DNA onto different transducers are water soluble carbodimide l-(3-dimethyaminopropyl)-3-ethyl-carbodimide (EDC), IV-hydroxysuccimide (NHS), mercaptohexanol (MCH), aminoethanethiol (AET), mercaptosilane (MSi), and N-cyclohexyl-lV -[2-(N-methylmorpholino)-ethyl]carbodimide-4-tolune sulfonate (CDS). 

Insulin Oxidation of tyrosine residues at pre-treated (+1.7V, 30s) microfabricated SPCEs Potentiometric stripping analysis (2 min accumulation at -0.2V) Stripping current of 3 pA 0-600 nM 20nM Wang et al. [76]... 

SPMBE = screen-printed microband electrode, ASV = anodic stripping voltammetry, HCMV = human cytomegalovirus, PGE = pencil-graphite electrode, DPV = differential pulse voltammetry, SPEs = screen-printed electrodes, PSA = potentiometric stripping analysis, M-GECE = magnetic graphite-epoxy composite electrode. 

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