Automatic combustion methods for the determination of sulfur, chlorine, bromine, and iodine are described. By the use of a modified Grote combustion tube in combination with volumetric procedures, satisfactory micromethods have been developed. The indicators used are dipotassium rhodizonate lor sulfur, dichlorofluorescein for chlorine and bromine, and starch solution for iodine. The largest standard deviation for these methods was found to be ±0.14% for sulfur, ±0,10% for chlorine, ±0.17% for bromine, and ±0.15% for iodine in the group of compounds analyzed.Methods are also described for the acid-base titration of sulfur (in the absence of acid-forming elements other than carbon) and for the determination of traces of chlorine employing a turbidimetric estimation of the chloride ion.
We We report report about a a cclrnbinatlon of micro-contact-printing micro-contact-printing and the sol-gel sol-gel technique technique which which results in structures in the the mlcroo-and submtcmn submtcmn range. range. This This technrque which is is here here demonstrated demonstrated on electrochromic tungsten oxide does not rely on vacuum methods and may therefore therefore be be easily easily upscaled to large areas. Q Q 2000 Elseviw Sc~ence $.A. All All nghts nghts reserved. reserved.
The precision of the method was at first astonishing, in view of the inability of Breh and Gaebler (1) to titrate a similar precipitate with permanganate because of the silver present. Runs on known amounts of potassium were reproduced within an average deviation of 0.02 ml.
Table I. Recovery of Potassium from Potassium Sulfate Solutions(Standard K2SO4 solutions: Stock, containing 1.0 mg. K per ml., prepared by dissolving 0.2227 gram of pure dry K2SO4 in 100 ml. of distilled water.Working (1) containing 0.10 mg. K per 5.0 ml., (2) containing 0.20 mg. K per 5.0 ml.) Potassium Added0 Potassium Recovered Mg.Mg.
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