Electrochemical phase formation of calomel under linear potential sweep conditions

Electrocrystallization involved in electrochemical phase formation of anodic fi!rns is shown to manifest itself with characteristic features in current-potential response in potential sweep experiments that can be employed as diagnostic criteria. Results on calomel (HgzCI2) formation and growth on mercury are presented and discussed in the pape

Ultrasonic velocity measurement of liquids by the dual technique mode

Of the various techniques available for the measurement of ultrasonic velocity, !he optical method and interferometric method appear to be most widely used. An experimental set up with a provision to measure ultrasonic velocity both by optical and interferometric method is described in this pape

Free Convective Unsteady MHD Flow of Newtonian Fluid in a Channel with Adiabatic

ABSTRACT In this paper, we investigated an unsteady free convection MHD flow of an incompressible viscous electrically conducting fluid under the action of transverse uniform magnetic field between two heated vertical plates by keeping one plate is adiabatic. The governing equations of velocity and temperature fields with appropriate boundary conditions are solved by using perturbation technique. The effects of various physical parameters on the velocity and temperature fields are discussed in detail with the help of graphs

Electrochemical devices for trace analysis and pollution control

A broad classification of electroanalytical methods into equilibrium potential measurements and impedance measurements is presented. The ion selective electrode approach in the former and polarographic, voltammetric and stripping analysis methods in the latter are the more popular methods and are discussed in greater detail than the other methods. The application of electroanalytical chemistry in Marine Electrochemistry are then traced. Some special advantages of voltammetric method of analysis when compared to atomic absorption spectroscopy are brought out. Anodic Stripping Voltammetry and O2 sensors are also discussed in some detail

Anodic stripping voltammetry (asv) of chromium (vi) in metal finishing effluents

Hexavalent chromium is a highly toxic pollutant in industrial electroplating and rnetal finishing effluents. Even though several colorimetric procedures are'available for the estimation of hexavalent chromium, electrochemical methods for its estimation are scanty. In the present work conditions were standardised for estimating CP+ by ASV. The method is applicable over diierent pH ranges and linear calibration plots are obtained in the range 5 x 10-6 to 10-4M of Crt

A simple potentiometric stripping method for copper in plating waste

A potentiometric stripping analysis of copper applicable to raw waste streams from common metals plating industry is described. Glassy carbon is employed as the working electrode. The possible reactions that would take place during the stripping process are discussed. It has been possible to estimate less than I ppm of Cu by this method and it is free from interference by other metallic impurities present in common metal plating effluent

Differential pulse polarographic analysis of thin-film tin-cadmium alloy deposit over mild steel

A differential pulse polarographic method has been developed to estimate tin and cadmium simultaneously in presence of large excess of iron. Alloy deposits of Sn and Cd having different compositions were analysed and the percentages of alloy compositions were calculated in each case. It has been possible to estimate ppb levels of Sn and Cd by this method

Application of ion selective electrodes for corrosion monitoring-I:Corrosion of copper

Ion Selective Electrodes IISE) developed recently have established themselves as powerful analytical probes for estimation of ionic species present in trace and ultra trace levels in solution. The ease of operation coupled with high sensitivity has enabled their successful applications in multifarious fields. Studies on the use of ISE for estimation of metallic corrosion by resorting to solution analysis are scarce. The results of evaluation of corrosion of copper in chloride and acetate media have been described. Use of ISE's for estimation of inhibition efficiency has also been attempted. The results have been compared with data obtained from weight loss and atomic absorption spectroscopy

Differential pulse polarographic analysis of thin-film tin-cadmium alloy deposit over mild steel

A differential pulse polarographic method has been developed to estimate tin and cadmium simultaneously in presence of large excess of iron. Alloy deposits of Sn and Cd having different compositions were analysed and the percentages of alloy compositions were calculated in each case. It has been possible to estimate ppb levels of Sn and Cd by this method