Frequency Titration Research Articles

High frequency titration of Al 3+ with Ba(OH) 2.

High frequency titration of Al 3+ with Ba(OH) 2.

High frequency titrations of silver and thallium (I) with sodium tetraphenylborate.

High frequency titrations of silver and thallium (I) with sodium tetraphenylborate.

Determination of thallium by high-frequency titration with sodium tetraphenylboron

A method was developed for the determination of thallium by high- frequency titration with NaB(C/sub 6/H/sub 5/)sub 4/. Cations which do not react with NaB(Csub 6/H/sub 5/)/sub 4/ do not interfere. The determination is possible in weakly acid as well as in alkaline medium. (auth)

High frequency titrations. I. The silver-thiocyanate reaction

High frequency titrations. I. The silver-thiocyanate reaction

High Frequency Titrations of Silver and Thallium(I) with Sodium Tetraphenylborate

High Frequency Titrations of Silver and Thallium(I) with Sodium Tetraphenylborate

High frequency titration and estimation of ions: Determination of silver

High frequecy titration has been found to be a highly suitable technique for the volumetric estimation of silver with potassium chloride, potassium bromide, potassium iodide, ammonium thiocyanate, 2-mercaptobenyothiazole and bismuthiol II. The results have been accurate when the amount of silver present was not more than 15 mg. Titration of potassium cyanide with silver nitrate gives an end-point corresponding to the complex K[Ag(CN) 2]. Reverse titration fails to give any sharp break. Mercaptobenzimidazole, bismuthiol I and potassium chromate were not suitable reagents in these determinations.

High frequency t1tration and estimation of ions: Determination of barium, lead, thallium, calcium, cerium, copper and silver

Solutions of potassium chromate, ammonium oxalate and ferrocyanide are used as titrants for the high frequency titration of metal ions. Lead and barium, up to 20 mg, and thallium, up to 50 mg, are estimated with chromate und yield good results. Similarly, ammonium oxalate behaves satisfactorily when the concentration of calcium is not more than 10 mg and that of cerium is between 10 and 40 mg. Copper and silver can be titrated by ferrocyanide only up to a concentration of 10 and 20 mg, respectively. In all cases, the pH of the solution should preferably be between 6.0 and 6.5, though it can be extended in some cases to as low as 5.0.

High frequency titrations: The silver-thiocyanate reaction

A high frequency (oscillometric) method for the titrimetric determination of small amounts of silver at dilutions down to 1 4000 M with ammonium or potassium thiocyanate is described. Reverse titrations in the same order of dilution are also feasible. Oscillometric studies on the formation of soluble mercuric thiocyanate and of the sparingly soluble zinc tetracyanatomercuriate(l1) are in progress.

Hochfrequenztitration. 1. Mitteilung Apparatur zur Ausführung von Hochfrequenztitrationen

AbstractThe construction of a beat frequency apparatus for high frequency titrations and for measurements of dielectric constants is described. The stability of the system is discussed and the accuracy of the device for conductivity titrations is statistically tested.

High Frequency Titration of Lead

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Frequency Titration of LeadD. T. Sawyer and P. S. FarringtonCite this: Anal. Chem. 1957, 29, 11, 1688–1690Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Published inissue 1 November 1957https://doi.org/10.1021/ac60131a040RIGHTS & PERMISSIONSArticle Views44Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (345 KB) Get e-Alerts Get e-Alerts

High frequency titration involving chelation

有機試薬を用いる金属イオンの滴定法を,メタノール・ベンゼン中過剰の有機試薬の存在でナトリウムメチラート試液により滴定する間接非水滴定,水溶液中で同様にして苛性ソーダ試液により滴定する間接水溶液滴定および水溶液中で有機試薬試液で滴定する直接滴定の三つの法について検討した.用いたものは銅,ニッケル,コバルトとジチゾン,ジメチルグリオキシム,α-ニトロソ-β-ナフトール,オキシンである.両者のモル比はニツケルのある場合以外1:2であった.間接滴定による方法は応用できる例が直接法より多い.吸着のためと思われる負誤差が若干みられるが,今後有用な分析法として期待し得るものと考えられる.

High Frequency Titrations of Some Substituted Anilines in Glacial Acetic Acid

High Frequency Titrations of Some Substituted Anilines in Glacial Acetic Acid

High frequency titrimetry

High frequency titrations have been carried out with a crystalcontrolled oscillator at 5 Mc. A measure of the change in the high frequency conductance during a titration is obtained by determining the grid bias at resonant frequency with a vacuum tube voltmeter after each addition of titrating solution. The following monovalent phenols have been examined: phenol,o-, m- andp-cresol,α- andβ-naphthol and 2-retenol. Of the di- and trivalent phenols we have titrated pyrocatechol, resorcinol, hydroquinone, pyrogallol and phloroglucinol. The compounds (0.5–5 mg) have generally been dissolved in benzene-methanol 2∶1 and they have been titrated with potassium methoxide in benzene-methanol 10∶1. Each hydroxyl group in a molecule gives rise to a break in the titration curve. A number of mixtures of monovalent phenols have also been titrated. Each component in the mixture causes a break in the titration curve. This means that the component with the highest dissociation constant is first titrated, and then the others in order of decreasing dissociation constant.

High frequency titrations of some organic functional groups

The high frequency titration of various organic acids and bases has been studied. The application of high frequency techniques in titrations of inline, oxime and other functional groups has been found useful. In general, these methods seem widely applicable in the determination of organic compounds and functional groups and can be used for the analysis of dilute systems.

High frequency titrations involving chelation with ethylenediaminetetraacetic acid: Complexation with rare earths

High frequency titrations have been utilized in studying the chelation of rare earth metals with ethylenediaminetetraacetic acid. The use of high frequency titrations for the determination of rare earth metals has also been studied. A procedure is proposed based on direct titrations with disodium ethylenediaminetetraacetate in buffered solutions. Excellent end-points are obtained and the method is accurate in the absence of other metals that might react with the titrant.

抗結核剤の試験管内作用に対する金属イオンの影響と錯塩形成との関連 (第2報)

Formation of a complex salt was examined in 55 combinations of antitubercular agents, PAS, INAH, TB-1, SM, and DHSM with Ca, Co, Ni, Fe (III), Al, Hg, Mg, Zn, Cd, and Co (II). In order to find out the state in lower concentrations, effect of metal addition on the ultraviolet absorption curve of aqueous solutions of PAS, INAH, and TB-1 and that of addition of SM or DHSM on the ultraviolet absorption curve of aqueous solution of metals were observed. The breaking point in the high frequency titration curves obtained by the dropwise addition of an aqueous solution of antitubercular agent into metal solution was also examined. As for changes in the ultraviolet absorption curves, a shift of the maximum absorption was observed in a combination of PAS with Al or Hg, INAH and Hg, TB-1 with Cu and Hg, SM and Cu, and DHSM and Cu, a change in wave form in that of PAS and Fe (III), and a change in absorbancy at the maximum absorption in combinations of PAS with Cu, Al, and Hg, INAH with Cu, Ni, Hg, and Mn, TB-1 with Cu, Fe (III), Al, and Hg, SM with Co, Fe (III), Hg, Zn, and Mn, and DHSM with Ca and Cu. Appearance of a breaking point in high frequency titration curve was observed in combination of PAS with Co, Ni, Fe (III), Al, Hg, Mg, and Mn, INAH with Ca, Co, Ni, Fe (III), Hg, Zn, and Co (II), TB-1 with Ca, Co, Ni, Fe (III), Al, Hg, and Mn, SM with Al, Hg, and Mg, and DHSM with Al and Hg. The result from the second method agreed by 63.6%, complex formation was observed in eight combinations by the ultraviolet absorption and in 12 combinations by the high frequency titration alone.

高周波容量分析 第16報

Alkaloids were titrated in glacial acetic acid by the high frequency method and a new, simple titrator was devised for it, giving good results. The limit of the strength of bases that could be titrated was the dissociation constant of about 10-10 in aqueous solution. Results of this high frequency titration were approximately the same as those obtained by potentiometric or indicator methods.

High frequency titrations involving chelation with ethylenediaminetetraacetic acid: Complexation of thorium nitrate

High frequency titrations have confirmed the reacting ratio of thorium to ethylenediaminetctraacetic acid to be l to 1. It has also been shown that thorium can be determined by oscillometric titration using either the hydrogen release method or the direct titration technique. The method is especially interesting for the determination of small amounts of thorium in dilute solution.

The Change of Glucose Injection by Sterilization with Heating

Estimation of pH of commercial glucose injections by use of glass electrode showed to be pH 3.54.3. These lower pH values are attributed to the decomposition of glucose by heating to 5-(hydroxymethyl)-2-furaldehyde, its further decomposition gives an equimolar mixture of formic acid and levulinic acid and glucose injection's buffer action are very slight and cause much error when estimated by pH indicating papers. The concentration of formic acid and levulinic acid, respectively, is 5 × 10-5 to 5 × 10-4 N. The acidiy can be estimated by high frequency titration or it can be estimated by making a graph from relations of concentration of acid and pH values. Although these lower pH values are considered to be harmless for injection due to its weak buffer action, it is rather striking to note such lower pH values and a sugestion for revision of Pharmacopoeia Japonica VI is made, since it specifies to be pH 5. 07. 0

High frequency titrations involving chelation with ethylenediaminetetraacetic acid: Determination of uranyl ion

It has been shown that for the pH range of 3.5 to 4.0, ethylenediaminetetraacetic acid reacts with uranyl ion to form a stable salt. The reacting ratio was found to be 2 : 1 (metal to addendum) which is in contrast to the usual reacting ratio of 1 : 1 obtained with ethylenediaminetetraacetic acid and other heavy metals. The chelate obtained with uranyl ion is probably a pseudo salt. A high frequency titration employing tri-sodium ethylenediaminetetraacetate is suggested for the determination of uranyl ion.