Electrolytic hydride generation

In electrolytic hydride generation, a cell as shown schematically in Fig. 55 can be used [158]. It is made of PTFE rings and disks and can be easily disassembled for cleaning. The electrodes are platinum sheets with a surface of 10 cm2 each. The compartments of the anode (10 cm2) and the cathode (2 cm2) both have a solution inlet and outlet and are separated by a Nation membrane. The cell is held together with six screws. Solutions of the sample acidified with HC1 are used as the catho-lyte and dilute H2S04 as the anolyte. At a cell current of a few amperes, the solutions are continuously fed through the cell compartments, and on the cathodic... 

D. (1995) A flowing electrolytic hydride generator for continuous sample introduction in atomic spectrometry, Anal Chim Acta 316 129-44. 

N. Etxebarria, R. Antolin, G. Borge, T. Posada and J. C. Raposo, Optimisation of flow-injection-hydride generation inductively coupled plasma spectrometric determination of selenium in electrolytic manganese, Talanta, 65(5), 2005, 1209-1214. 

The separation of As species (As(in), As(V), MMAs(V), DMAs(V), AsB, AsC) has also been accomplished by CE (electrolyte in the pH range 5.6 11.2 phosphate, triethanolamine or borate buffers), but only in simple aqueous matrices. Online hydride generation in capillary effluent has been proposed to increase transport efficiency. SFC has been nsed only for nonpolar As compounds, like trimethyl-, triphenylarsine, and triphenylarsine oxide. ... 

Broekaert J. A. C. (2001) Optimization of electrochemical hydride generation in a miniaturized electrolytic flow cell coupled to microwave-induced plasma atomic emission spectrometry for the determination of selenium,... 

A laboratory-made electrolytic cell was designed as an electrolytic generator of the molecular hydride of Cd. The influence of several parameters on the recorded signal was evaluated by the experimental design and subsequently optimised univariately... 

M. Fuchs, F. Barbir and M. Nadal, Performance of Third Generation Fuel Cell Powered Utility Vehicle 2 with Metal Hydride Fuel Storage , presented at the 2001 European Pol5uner Electrolyte Fuel Cell Forum, Lucerne, Switzerland, July 2001... 

Although infrequently used, electrochemical generation of the hydrides is also possible and has been applied to the determination of arsenic and tin in a batch approach and to antimony, arsenic, germanium, selenium, and tin using a flow-through electrolytic cell. The hydride is generated in the cathodic space of an electrolytic cell, with concurrent oxidation of water in the anodic compartment, as illustrated by the reaction below. Here, Me-E represents the reduced analyte element on the metallic cathode surface (Me) ... 

NiMH, due to its KOH/H2O electrolyte, provides performance as function of temperature similar to nickel-cadmium with some exceptions. Capacity dependence as a function of temperature is strongly influenced by the active material selection of the metal hydride and nickel hydroxide, and typical commercial NiMH performance is presented in Fig. 30.15. At low temperature, NiMH has reduced discharge capacity and power compared to NiCd because the metal hydride electrode is polarized due to the generation of water on discharge. On the other hani whereas NiCd has some difficulty with charging at cold temperatures, and particularly fast charge at eold temperature, NiMH is mueh less sensitive to this effect. 

---