Azidimetrische Borsäurebestimmungen

Liempt, J. A. M. van

doi:10.1002/zaac.19201110112

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…The first three compounds require no special comment. By virtue of their respective structures they fall into the general classification of substances studied by Bóeseken (4) and recommended for study by van Liempt (10), i.e., those compounds having hydroxyl groups on the same side of adjacent carbon atoms. Dihydroxyacetone definitely differs from this class of substances, yet it strikingly potentiates the dissociation of boric acid with an effect equal to that of its isomer, glyceric aldehyde.…”

Section: Discussionmentioning

confidence: 99%

A Further Study of the Effect of Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

Krantz¹,

Carr²,

Beck³

1936

J. Phys. Chem.

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Studies on the influence of mannitol and dulcitol and certain of their anhydrides on the dissociation of boric acid were reported in a previous communication (7). In general, the increased dissociation of boric acid produced by sugar alcohols was exhibited to a lesser degree or not at all by their anhydrides. Another series of these substances has been made available for study, and further investigations as to the effect of these compounds on the dissociation of boric acid have been instituted. MATERIALSThe-inositol, erythritol, pentaerythritol, and adonitol employed were Pfanstiehl's c.p. products and met the specifications of their catalogue.Ethylene glycol, ethylene oxide, propylene glycol, propylene oxide, and trimethylene glycol were supplied by the Eastman Kodak Co. The dihydroxyacetone employed was Oxantin, prepared formerly by Merck and Co. The epihydrin alcohol was prepared from epibromhydrin (1). The Z-epihydrin alcohol, distilling at 70°C. at 10 mm. pressure, was employed. The polygalitol was extracted from poly gala amara (9). The compound melted at 138°C. (uncorrected). The erythritan was prepared from erythritol by dehydration with sulfuric acid (2,6). Analysis gave the

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Section: Discussionmentioning

confidence: 99%

A Further Study of the Effect of Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

Krantz¹,

Carr²,

Beck³

1936

J. Phys. Chem.

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“…Analytical procedure.--Samples were ground to a --100 mesh, hydrochloric acid leached or treated with chlorine under conditions to be described later under Boron Upgrading. Finely ground boron was rendered water soluble by a sodium carbonate fusion and was then titrated as the mannitol complex (14). The standard deviation for 16 duplicate analyses on different samples was -----0.4%.…”

Section: Laboratory Equipment and Proceduresmentioning

confidence: 99%

High-Purity Crystalline Boron

Stern¹

1958

J. Electrochem. Soc.

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Vapor phase reduction of boron trichloride with hydrogen on electrically heated filaments in flow systems was investigated as a potential method for the preparation of high-purity boron. Experiments were conducted on laboratory and bench-scale flow reactors. Conversion efficiency was a function of mole ratio of reactants, residence time, mass of deposit, and deposition temperature.Massive deposits of crystalline boron analyzing as high as 99.6% by direct chemical analyses were obtained. Purity of boron appeared to be a function of both filament diffusion and boron trichloride purity. Titanium filaments were found to be most satisfactory, since contamination due to titanium could be removed by chlorination at 300~ X-ray diffraction studies indicated that titanium probably existed in solid solution with boron rather than as a boride.

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“…The effect of mannitol on the strength of boric acid has been investigated quite extensively [15][16][17][18][19][20][21][22]. Much of this work can be summarized from the analytical standpoint as follows: (a) boric acid becomes stronger as the mannitol concentration increases; (b) in concentrated solutions, anomalous conductance values indicate association; (c) electrolytes in solution affect the boric acid hydrolytic equilibrium.…”

Section: Experimental Variablesmentioning

confidence: 99%

High-precision coulometric titrations of boric acid

Marinenko¹,

Champion²

1971

J. RES. NATL. BUR. STAN. SECT. A.

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An abso lute me th od wa s deve lope d for th e de te rmin a ti on of boric ac id by coulome tri c titrim etry. Th e prec is ion of th e me thod , ex pressed as th e s ta nd a rd de viation of a s in gle de te rmin ation is 0.0033 pe rcen t. C ha nges in th e inves ti gate d titration param ete rs produ ced no s ignifi cant effects on th e titrati o n res ult s. Indi c a ti ons are th a t within th e un ce rtainty of meas ure me nt s the me thod is b ias free.Key words: Acc ura te a na lys is; bori c a cid : co ulometri c titra ti on ; hi gh-p recision acid im e try; hi gh prec is io n co ul ome try. . IntroductionTh e National Bureau of Standard s condu cts a great deal of researc h towards es tabli s hm e nt of absolute standard s in all areas of th e meas ure me nt field . One ar ea whi ch e nables analyti cal quantifi cation of c he mical property on the absolute basis is co ulo me try. For thi s reason, ove r a numbe r of years, an inte nse effort has bee n mad e to d evelop me thods for precise analysis and to test the acc uracy of th ese methods [1 -5].1 This paper is one of a series of articles on th e de velopm e nt of pre cise coulometri c me th ods and th eir appli cation to c harac te rizati on of high purity standard refere nce materials (SRMs).Th e expanding use of boron and its co mpounds in nuclear tec hnology a nd th e NBS program co ncern ed with the iss uan ce of an SRM for ne utron flux monitorin g necessitated th e de ve lopme nt of a me thod for th e prec ise a nd acc ura te determination of thi s ele me nt. Th e mos t wid ely used me thod for the determination of milligram amounts of boron involves titration of boric acid in the presence of a polyol [6], us ually mannitol. Howe ver, thi s method is somewhat empirical in nature , partic ularly with re s pect to the amount of polyol required for titration and moreo ver, is generally precise to only a fe w parts p e r th ousand. Le Duigou and Lauer recently re ported a procedure for the coulome tric de te rmination of boron [7]. Th eir precision for l50-mg samples of boric acid was on th e orde r of 0.02 pe rce nt. Thus, th e m ethod appeared promising from the standpoint of precision, but th e di s turbin g fact is that these authors found a di screpancy of 0.1 perce nt be twee n the co ul ome tri c valu e a nd the va lue obtain ed b y conventional acidim e tri c titration . Referrin g to the coulo-* Presc nl ~Iddr~ss: \I c th ods Hesear('h a nd Tec hni(' a l Service Divi s ion. Eastrna n Kodak. Hoc hesle r, New Yo rk 14603. IFi gures in brackets indi cat e lit erature re fe rences at th e e nd of t hi s paper. me tri c me th od , th ese a uthors co ncluded that further studi es are necessary to improve its acc uracy. This co nclusion alone was s ufficie nt to a rouse our inte rest in the co ulometri c be havior of th e sys tem, particularly from th e s tandpoint of poss ible so urces of e rror whi c h apparently have not bee n ruled out in th e coulometric inves ti gation s of Le Duigo u and Lauer.W e th erefore und ertook inves ti gati on ...

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Azidimetrische Borsäurebestimmungen

Cited by 13 publications

References 3 publications

A Further Study of the Effect of Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

A Further Study of the Effect of Sugar Alcohols and their Anhydrides on the Dissociation of Boric Acid.

High-Purity Crystalline Boron

High-precision coulometric titrations of boric acid

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