Voltammetry, linear sweep anodic

Scarponi et al. [781] studied the influence of an unwashed membrane filter (Millpore type HA, 47 mm diameter) on the cadmium, lead, and copper concentrations of filtered seawater. Direct simultaneous determination of the metals was achieved at natural pH by linear-sweep anodic stripping voltammetry at a mercury film electrode. These workers recommended that at least 1 litre of seawater be passed through uncleaned filters before aliquots for analysis are taken the same filter can be reused several times, and only the first 50-100 ml of filtrate need be discarded. Samples could be stored in polyethylene containers at 4 °C for three months without contamination, but losses of lead and copper occurred after five months of storage. 

See also Voltammetry Linear Sweep and Cyclic Anodic Stripping Cathodic Stripping Inorganic Compounds Organic Compounds. 

Peter studied in detail the growth of anodic CdS films on the Cd electrode in similar solutions [31], as well as the processes that occur at the Cd/solution and CdS/solution interfaces [32], According to the linear sweep voltammetry, three characteristic regions could be distinguished revealing the essential features of the anodic passivation of cadmium in alkaline sulfide solutions (a) the monolayer... 

Despic, A. R., Identification of Phase Structure of Alloys by Anodic Linear Sweep Voltammetry, in Electrochemistry in Transition, O. J. Murphy, S. Srinivasan, and B. E. Conway, Eds., 1992, New York Plenum Press. 453. 

Peak potentials from linear sweep voltammetry of alkenes at a glassy carbon anode in methanol, sodium perchlorate. Sweep rate 20 mV s" ... 

Other Phenomena Interaction of metallic Pb in the mercury phase [38] and amalgam decomposition in alkaline medium [39] have also been discussed. Formation of anodic monolayer PbCOs or Pb3(C03)2(0H)2 on Pb(Hg), depending on pH, in carbonate or bicarbonate solutions, has been detected using electrochemical methods (chronoamper-ometry and linear sweep voltammetry) and powder X-ray diffractometry [40]. 

Voltammetry is an electroanalytical technique most widely used for transduction as the anodic and cathodic peak potential is characteristic for a particular target redox analyte. In this transduction, current is measured vs potential swept. Similarly to chronoamperometric detection, the analyte diffuses through the MIP film towards and, in some cases, away from the electrode surface. Linear sweep voltammetry... 

Measurements of the open circuit potential (OCP) were performed by linear sweep voltammetry with the anode of the electrolyser set as the working electrode, and the cathode set as both counter and reference electrodes. The hydrogen reference electrode condition was created by saturating the catholyte with H2 gas at the room temperature. The measured OCP values were refered to the standard hydrogen electrode (SHE). Since the potential of the hydrogen reference electrode varied from SHE depending on the HC1 concentration used in the experiement, this correction was taken into account for all measured OCP. 

There is additionally the important problem involved in choosing the reduction or oxidahon potential of the electrolyte solutions from either cyclic voltammetry (CV) or linear sweep voltammetry (LSV). Since the oxidation or reduction reachon of cations or anions contained in the RTILs are electrochemically irreversible in general [8-10], the corresponding reduction or oxidation potential cannot be specifically obtained, unlike the case of the redox potential for an electrochemically reversible system. Figure 4.1 shows the typically observed voltammogram (LSV) for RTILs. Note that both the reduchon and oxidation current monotonically increase with the potential sweep in the cathodic and anodic directions, respectively. Since no peak is observed even at a high current density (10 mA cm ), a certain... 

The major voltammetric methods employed for studies of the anodic oxidation of aromatic hydrocarbons are linear sweep voltammetry (LSV), cyclic voltammetry (CV), and derivative cyclic voltammetry (DCV). Second harmonic ac (SHAC) voltammetry and... 

Part IV is devoted to electrochemical methods. After an introduction to electrochemistry in Chapter 18, Chapter 19 describes the many uses of electrode potentials. Oxidation/reduction titrations are the subject of Chapter 20, while Chapter 21 presents the use of potentiometric methods to obtain concentrations of molecular and ionic species. Chapter 22 considers the bulk electrolytic methods of electrogravimetry and coulometry, while Chapter 23 discusses voltammetric methods including linear sweep and cyclic voltammetry, anodic stripping voltammetry, and polarography. 

Of these, anodic stripping voltammetry (43), both linear sweep and differential pulse, incorporates a pre-concentration feature and therefore... 

The Cj-Ej case has been treated for linear sweep voltammetry (25). Because of the irreversibility of the electron transfer, no anodic current is observed on the reverse scan and cyclic voltammetric behavior need not be considered. Typical i-E curves are shown in Figure... 

Studies made with this instrumentation on other voltammetrlc techniques such as anodic stripping voltammetry allow one to conclude that the optimization of initial d.c. linear sweep or stripping data leads to optimum performance In the semi-integral, semi-differential and derivative approaches and that, under Instrumental equivalent conditions where d.c. experiments have been optimized with respect to electronic noise and background correction, detection limits are not markedly different within the sub-set of related approaches. Obviously, the resolution and ease of use of a method providing a peak-type readout (semi-differential) are superior to those with sigmoidally shaped read- outs (semi-integral). 

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