Effect of chloride ion and ionic strength on the response of a copper(II) ion-selective electrode

1977 ◽  
Vol 49 (6) ◽  
pp. 877-879 ◽  
Author(s):  
G. B. Oglesby ◽  
W. C. Duer ◽  
F. J. Millero
Keyword(s):  
Ionic Strength ◽  
Chloride Ion ◽  
Ion Selective Electrode ◽  
Selective Electrode

Titration of sulphates and lead using lead ion selective electrode

1981 ◽  
Vol 46 (2) ◽  
pp. 368-376 ◽  
Author(s):  
Josef Veselý
Keyword(s):  
Ionic Strength ◽  
Electrode Surface ◽  
Salt Content ◽  
Ion Selective Electrode ◽  
Lead Ion ◽  
Selective Electrode ◽  
Limit Of Determination ◽  
Total Salt Content ◽  
Automatic Titration

Titration of sulphates with lead perchlorate employing lead ion selective electrode indication was studied using additions of various organic solvents at different pH' and ionic strength values. As the optimum emerged systems with 60-70% 1,4-dioxane, pH' 5.3-5.6. After dehydration with sodium hydroxide, dioxane must be freed from the electrode surface-oxidizing impurities by their reduction with sodium metal and subsequent distillation. The method was applied to determination of sulphates in mountain spring waters. Units of ppm can be determined; the limit of determination, however, depends considerably on the content of dioxane, total salt content in the sample, and speed of the semi-automatic titration. Lead can be determined with EDTA in concentrations down to c(Pb2+) = 5 . 10-6 mol l-1.

Determination of Iodide in Feeds and Plants by Ion-Selective Electrode Analysis

1971 ◽  
Vol 54 (4) ◽  
pp. 760-763
Author(s):  
William L Hoover ◽  
James R Melton ◽  
Peggy A Howard
Keyword(s):  
Ionic Strength ◽  
Solid State ◽  
Necessary Conditions ◽  
Ion Selective Electrode ◽  
Phosphate Solution ◽  
Selective Electrode ◽  
Aoac Method ◽  
Low Levels ◽  
High Concentrations

Abstract A method for determining low levels of iodide in feeds and plants is proposed. The samples are mixed with a 10% phosphate solution to maintain relatively constant ionic strength and pH and analyzed with a solid-state iodide electrode. Ashing is not required and there are no significant interferences by ions commonly found in feeds. The method is accurate in determining iodide content ranging from 10.0 ppm to high concentrations. Necessary conditions for storing and cleaning the electrodes are described. The proposed method is rapid and results compare favorably with AOAC method 7.091.

Ion Selective Electrode for Determination of Chloride Ion in Biological Materials, Food Products, Soils, and Waste Water

1978 ◽  
Vol 61 (6) ◽  
pp. 1493-1495 ◽  
Author(s):  
Ivan Sekerka ◽  
Josef F Lechner
Keyword(s):  
Waste Water ◽  
Chloride Ion ◽  
Food Products ◽  
Biological Materials ◽  
Nutrient Broth ◽  
Ion Selective Electrode ◽  
Sample Treatment ◽  
Selective Electrode ◽  
Beef Extract

Abstract The chloride ion selective electrode is used for a rapid, simple, and reliable determination of chloride ion in biological materials (blood serum, urine, fish, and plant tissues), food products (milk, beef extract, nutrient broth and orange, tomato, and grapefruit juices), soils, and waste water (industrial and municipal). The method consists of treating the samples with perchloric acid (pH 1) and potassium peroxydisulfate and determining the chloride content either by a calibration curve or by known addition or analyte addition, using the chloride ion selective electrode. Such sample treatment eliminates most of the interferences occurring in the samples, including iodide, complexing and reducing compounds, and macromolecular and surface-active species. The method is suitable for a wide range of chloride concentration, e.g., 5010 ppm CI in nutrient broth and 4890 ppm in beef extract and as low as 12 and 80 ppm in soil extracts.

Analysis for Chloride Ion in High Purity Water and Heavy Water of Pressurized Reactors and Cooling Systems by Ion Selective Electrode

1977 ◽  
Vol 60 (3) ◽  
pp. 625-627
Author(s):  
Ivan Sekerka ◽  
Josef F Lechner ◽  
Les Harrison
Keyword(s):  
Heavy Water ◽  
High Purity ◽  
Water Samples ◽  
Chloride Ion ◽  
Ion Selective Electrode ◽  
Steam Generators ◽  
Selective Electrode ◽  
Cooling Systems ◽  
Reliable Determination ◽  
Standard Solutions

Abstract A rapid, simple, sensitive, and reliable determination of parts per billion (ppb) levels of chloride ion is described for high purity water or heavy water of pressurized and high temperature reactors, steam generators, and cooling systems by mercurous chloride-mercuric sulfide ion selective electrode. The method has been applied to heavy water samples of CANDU-type nuclear reactors as well as to the water of conventional steam generators. The manual method consists of treating 100 ml aliquots of standard solutions and water samples with 1 ml 2M HNO3. A calibration curve is constructed from the millivolt readings obtained in the standard solutions, and chloride ion concentration of the samples is determined by comparing the mv reading of the sample with the calibration graph. The automated and computerized version provides all operations automatically, together with a direct printout of the concentration and indexing. The electrode displays near-Nernstian response for the range 0.05–3.500 ppm chloride and can be used for concentrations as low as 0.02 ppm. Comparative tests and coefficients of variation are highly satisfactory.

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