Application of ASV for Trace Metal Speciation II. Digital Simulation of Neopolarogram Using Hanging-mercury-drop Electrode

A program for the digital simulation of neopolarography is described and the results of neopolarograms using hanging mercury drop electrodes are discussed

Application of ASV for Trace Metal Speciation III. Simulated and Experimental N eopolarograms Using Rotated Disk Electrodes

The digital simulation procedure for neopolarograms using rotated disk electrode is described and the properties of reversible. and nonreversible neopolarograms are discussed. The results are compared with experimental neopolarograms of lead in perchlorate medium. The theory of neopolarography using thin mercury film electrodes is developed

Determination of Barium in Uranium Compounds by Conductometric Titration

A method for the determination of barium by conductometric titrn.tion in the precipitates of the system uranyl nitrate -potassium hydroxide - barium nitrate, is proposed. The precipitates were dissolved in concentrated nitric acid and uranium separated by means of continuous extraction with tetrahydropyrane. Barium could be determined from 0,.6 to 7 mg with a standard error of about 0.12 mg Ba. The lowest gramatomic ratio Ba/U was 1.8 X 10-4

Square Wave Po1arography of Uranium(VI). II. Influence of Surface Active Agents

The influence of surface active ag ents on the square wave polarographic behaviour of uranyl acetylacetone was investiga t ed. Tritone-X-100 decreases specifically the S.W. peak height of each uranyl-acetylacetonato species, i.e. the adsorption layer is specifically penetrable by each one. From this sp ecific depression the over-all stability constant of uranyl acetylacetonato complexes, in 1 M sodium perchlorate, was calculated as log ~2 = 12 .5. This is in agreement with earlier obtained results3• Elec trocapillary curves for T-X-100 and acetylacetone are also prese nted

Application of ASV for Trace Metal Speciation IV. Determination of Lead-Chloride Stability Constants by Rotating Mercury Coated Glassy Carbon Electrode

The stability constants of lead-chloride complexes were determined by the neopolarographic method using rotating mercury coated glassy-carbon electrode. The results were compared with the literature and discussed

Polarographic Determination of Ruthenium in Citrates and Tartrates Solutions

Polarographic methods are proposed for the determination of small amounts of ruthenium in two new supporting electrolytes: a. citric acid (0.3 M) and sodium hydroxide (0.15 M); b. tartaric acid (0.2 M), sodium hydroxide (0.1 M) and thymol (0.009 %). Determination of ruthenium is applicable in the concentration range from 4 to 120 micrograms of ruthenium per milliliter with a relative standard errors from 15 to 0.8 % in both electrolytes. Hydrochloric, sulfuric and perchloirc acids (up to 0.5 N) do not interfer, but in the presence of nitric acid (any traces of nitrites) polarographic determinations are impossible

Polarographic Determination of Ruthenium in Citrates and Tartrates Solutions

Polarographic methods are proposed for the determination of small amounts of ruthenium in two new supporting electrolytes: a. citric acid (0.3 M) and sodium hydroxide (0.15 M); b. tartaric acid (0.2 M), sodium hydroxide (0.1 M) and thymol (0.009 %). Determination of ruthenium is applicable in the concentration range from 4 to 120 micrograms of ruthenium per milliliter with a relative standard errors from 15 to 0.8 % in both electrolytes. Hydrochloric, sulfuric and perchloirc acids (up to 0.5 N) do not interfer, but in the presence of nitric acid (any traces of nitrites) polarographic determinations are impossible

Spectrophotometric and Polarographic Determination of Ruthenium in Oxalic Acid

A spectrophotometric and polarographic method is proposed for the determination of ruthenium tetroxide absorbed in oxalic acid. Spectrophotometric measurements of ruthenium in 1 N oxalic acid were made at 375 mμ. In the concentration range from 2 to 36 micrograms of ruthenium per milliliter the relative standard error amounted 14 % to 1 %, respectively. The polarographic determination was performed in a supporting electrolyte containing 1 N oxalic acid and 0.006 % thymol (as a maximum suppressor). The determination is applicable in the concentration range from 4 to 120 micrograms ruthenium per milliliter with a relative standard error of 15 do 0.7 %, espectively. Hydrochloric, sulfuric and perchloric acid up to of 0.5 N does not interfere. In the presence of nitric acid spectrophotometric and polarographic determinations of ruthenium are impossible

A New Electrode System With Efficient Mixing of Electrolyte

In the last decade, many authors have emphasized the exceptional possibilities of polarography and the related advanced techniques for the determination and physico-chemical characterization of dissolved trace metals in natural aquatic systems.In addition to the quantitative aspects, it is also possible to characterize the physicochemical state of ionic species in natural and polluted wate rs. This is oL particular importance for the inve stigation of basic biogeochemical processes. These methods could be used for the elucidation of mechanisms and pathways in the biogeochemical cycles of a particular metal in natural and polluted aquatic systems

Spectrophotometric and Polarographic Determination of Ruthenium in Oxalic Acid

A spectrophotometric and polarographic method is proposed for the determination of ruthenium tetroxide absorbed in oxalic acid. Spectrophotometric measurements of ruthenium in 1 N oxalic acid were made at 375 mμ. In the concentration range from 2 to 36 micrograms of ruthenium per milliliter the relative standard error amounted 14 % to 1 %, respectively. The polarographic determination was performed in a supporting electrolyte containing 1 N oxalic acid and 0.006 % thymol (as a maximum suppressor). The determination is applicable in the concentration range from 4 to 120 micrograms ruthenium per milliliter with a relative standard error of 15 do 0.7 %, espectively. Hydrochloric, sulfuric and perchloric acid up to of 0.5 N does not interfere. In the presence of nitric acid spectrophotometric and polarographic determinations of ruthenium are impossible