Smartphone-based technique for the determination of a titration equivalence point from an RGB linear-segment curve with an example application to miniaturized titration of sodium chloride injections

Talanta ◽  
2021 ◽  
pp. 122602
Author(s):  
Kanong Ruttanakorn ◽  
Noppharat Phadungcharoen ◽  
Wanida Laiwattanapaisal ◽  
Akhayachatra Chinsriwongkul ◽  
Theerasak Rojanarata
Keyword(s):  
Sodium Chloride ◽  
Linear Segment ◽  
Equivalence Point

Determination of Relationship between Chemical Composition of Electrolyte and Surface Sample Quality

2015 ◽  
Vol 669 ◽  
pp. 150-157
Author(s):  
Peter Michal ◽  
Alena Vagaská ◽  
Miroslav Gombár
Keyword(s):  
Sodium Chloride ◽  
Chemical Composition ◽  
Oxalic Acid ◽  
Boric Acid ◽  
Oxide Layer ◽  
Surface Finish ◽  
Chemical Factors ◽  
Substrate Sample

Paper tracks experimentally confirmed relationship between chemical composition of electrolyte and resulting surface finish quality of created oxide layer during the process of anodic oxidation of aluminium. Examined chemical factors were: concentrations of sulphuric acid, oxalic acid, boric acid and sodium chloride. Aggressive effects of electrolyte were chosen as indicator of resulting layer quality – presence and extent of etching of used substrate sample.

DETERMINATION OF TRACE AMOUNTS OF SILVER IN GALENA ORES

1960 ◽  
Vol 38 (9) ◽  
pp. 1488-1494 ◽  
Author(s):  
E. J. Bounsall ◽  
W. A. E. McBryde
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Silver Content ◽  
Aqueous Sodium Chloride Solution ◽  
Aqueous Sodium

An analytical method is described for the determination of microgram amounts of silver in galena ores, based on the "reversion" of silver dithizonate. Silver is separated from relatively large amounts of lead by extraction as dithizonate into chloroform from an aqueous 1:99 nitric acid solution. Separation from mercury, which is also extracted under these conditions and would, if present, interfere in the analysis, is achieved by reverting the dithizonate solution with a 5% aqueous sodium chloride solution which is also 0.015 molar in hydrochloric acid. Following dilution of this aqueous solution and adjustment of pH, silver is again extracted into chloroform as the dithizonate, and determined absorptiometrically. Analyses of a number of galena ore samples showed a precision of within 3% for a silver content ranging from 0.03 to 0.4%.Some other methods for isolating silver from these samples, which were tried but found unsatisfactory, are discussed.

scholarly journals Determination of the Average Molar Mass of the Vapour Above Molten Sodium Chloride by the Transpiration Method.

1979 ◽  
Vol 33a ◽  
pp. 407-412 ◽  
Author(s):  
Halvor Kvande ◽  
Oldrich Strouf ◽  
Pär Svanström ◽  
Elina Näsäkkälä ◽  
Eberhard Hoyer ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Molar Mass ◽  
Average Molar Mass ◽  
Molten Sodium ◽  
Transpiration Method

A new method for the determination of ammoniacal nitrogen in soils

1924 ◽  
Vol 14 (4) ◽  
pp. 548-554 ◽  
Author(s):  
W. McLean ◽  
G. W. Robinson
Keyword(s):  
Sodium Chloride ◽  
New Method ◽  
Ammoniacal Nitrogen ◽  
Cent Solution ◽  
Base Exchange ◽  
Exchangeable Bases ◽  
Cent Sodium ◽  
Leaching Solution ◽  
Ammonium Compounds

A method for the determination of ammoniacal nitrogen in soils is described. It is an extension of the Hissink method for exchangeable bases to ammonium present in the soil. The working details are similar to the Hissink method, except that the leaching process is entirely carried out in the cold. The ammonia is distilled off with magnesium oxide.Using normal sodium chloride as a leaching solution and collecting half a litre of leachings for distillation with magnesia, results were obtained which showed excellent agreement with those by the aeration method. Similar results were obtained using 250 c.c. of 15 per cent, sodium chloride solution, but the results are on an average about 1·6 per cent, lower. With high proportions of ammoniacal nitrogen a second half litre of normal sodium chloride leachings should be taken, or half a litre of 15 per cent, solution used.The leaching method is economical of apparatus and water supply. It is therefore suitable for small laboratories with limited resources. It is fairly rapid: six estimations can be completed in a day.The close agreement of the new method with the aeration method suggests that the amount of ammoniacal nitrogen in the soil at any given time is not an arbitrary quantity depending on conditions of estimation, but a definite amount. It is improbable that any ammonium compounds exist in the soil apart from those which take part in base exchange.

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