Association of Salicylic Acid in Acetonitrile- Water Media

1033-103

Role of some complexing agents during electrodeposition of tellurium

205-210<span style="font-size:11.0pt;line-height: 115%;font-family:Calibri;mso-fareast-font-family:" times="" new="" roman";mso-bidi-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-US">he uses of electrodeposition processes for the production of tellurium as a pure metal from different baths containing tellurous acid with some suitable additives have been investigated. The quantity and quality of the deposited metal are found to be dependent on the type of the baths used. The effects of different parameters such as kind and concentration of acids, current density, temperature, electrode type (platinum and graphite) and metal to complexing agent concentration ratio on the cathodic efficiency and on the quality of deposit have been discussed. The interfering effect of some cations and anions has also been studied. Spectrophotometric, AAS and X-ray analyses revealed the purity of separated deposit to be 99.9%. An analytical application for preconcentration and separation of tellurium from its natural ores and alloys using the proposed electrolytic method is found to be satisfactory.</span

Electrolytic production of thallium metal and its oxide from TI(I) and TI(III) nitrates

266-270<span style="font-size:11.0pt;line-height: 115%;font-family:Calibri;mso-fareast-font-family:" times="" new="" roman";mso-bidi-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-US">The cathodic and anodic deposition of thallium as a pure metal or its oxide from different baths containing TI(I) or TI(III)nitrates with some suitable additives has been investigated. The quantity and quality of the metal and its oxide have been found to be dependent on the type of the bath used. The effect of different parameters such as <span style="font-size:11.0pt;line-height:115%;font-family:Calibri;mso-fareast-font-family: " times="" new="" roman";mso-bidi-font-family:arial;mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">p<span style="font-size:11.0pt;line-height:115%;font-family:Calibri; mso-fareast-font-family:" times="" new="" roman";mso-bidi-font-family:arial;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-US">H <span style="font-size:11.0pt;line-height:115%; font-family:Calibri;mso-fareast-font-family:" times="" new="" roman";mso-bidi-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-US">(1-12), current density (0.01-4.0 A dm-2), temperature (20-60°C), electrode type (platinum and graphite), metal and additives concentration on the cathodic and anodic efficiencies and on the quality of deposit has been studied. The interfering effect of some cations and anions has also been studied. Spectrophotometric, polarographic, AAS and X-ray diffraction techniques revealed the purity of separated deposit to be 99.9%. A suitable mechanism for the formation of the element and its oxide is suggested. An analytical application for preconcentration and separation of thallium from its natural ores and alloys using the proposed electrolytic method has been found to be satisfactory and successful.</span