Showing papers in "Analytica Chimica Acta in 1953"

TL;DR: In this paper, the conditions for the precise spectrophotometric determination of microgram amounts of ammonia by means of the sodium phenate-hypochlorite method of RUSSELL have been investigated.

TL;DR: In this paper, a technique detaillee est decrite for the determination of la composition des aliments en acides amines par Chromatographie de l'hydrolysat sur colonne de Dowcx-50 selon the methode de Moore et stein.

TL;DR: Synthetic mixtures of 15 of the most common amino acids were boiled with 6N HCl in the presence and absence of carbohydrate and the dilute conditions of hydrolysis correspond to those adopted for the determination of the amino acid composition of foods of high carbohydrate content.

TL;DR: In this article, a study devoted to the spectrophotometric determination of traces of copper with cuproine as reagent is presented, and two different calibration curves are determined, one based on complete extraction of the complex and the other based on an empirical method, which is very rapid.

TL;DR: The second review of quantitative colorimetric methods for the six platinum metals and covers the period from May, 1953 to March, 1957 is presented in this article, where each method is evaluated from the point of view of the optimum concentration range, specified and practical applications to thr assay for platinum metals.

TL;DR: In this article, the primary ionization constant of dithizone in ethyl alcohol-water mixtures has been determined, and the primary copper dithizonate is shown to be dissociated to some extent into the secondary dithizer and free dithitzer.

TL;DR: Paper chromatography has been applied for the separation of the alkali metals present as sulphates and citiateh as discussed by the authors, where the sulphates are made visible on the chromatogram by spraying the paper at first with barium chloride in 70% alcohol and then with Na-rhodizonate solution.

TL;DR: In this article, a colorimetric determination of molybdenum with disodium-1, 2-dihydroxybenzene-3,5-disulfonate (Tiron) has been presented.

TL;DR: In this paper, a vague polarugi aphique anodique de depolansation attnbuable a la formation d'un complexe stable avec le mercure and devient plus negatif lorsque le pH augmente.

TL;DR: In this paper, a method for the heterometric (photometric) titration (in alcoholic solution) of calcium salts with neutral potassium phthalate was presented for determining 10 mg of Ca in a tenfold excess of magnesium.

TL;DR: In this article, a general method for the determination of 5-1000 γ of osmium tetroxide was proposed, which involves extraction of ossium tetoxide with chloroform or carbon tetrachloride, followed by shaking the organic solvent with a sulfuric acid solution, of thiourea to form red Os(NH 2 CSNH 2 ) 6 +3, whose color intensity is measured photometrically.

TL;DR: In this paper, a new heterometric method was presented for the micro-determination of lead with alkal (citrate) citrate and for micro-determining citric acid with lead nitrate.

TL;DR: In this paper, a method for the micro determination of nickel with dimethylglyoxime was presented, where the error lies between zero and 0.4 mg per ml. But the time required for a titration at room temperature is 5-10 minuten.

TL;DR: Using a new "heterometric" method, a series of soluble and insoluble phthalates were obtained and their behavior, composition and analytical application studied as mentioned in this paper, and their properties and properties were analyzed.

TL;DR: In this article, a new method was presented for a quick, direct determination of small quantities (a.k.a. "heterometric" method) of small amounts of water.

TL;DR: In this article, the effect of time, temperature and of diverse ions on the coloured system with an absorption maximum at 440 mμ have been critically examined and the optimum range with minimum relative error was found to be in the region of 1.6 to 8 p.p.m.

TL;DR: In this article, the Rhodamininvcrbindung of Thallium(III) and rhodamine-chlorure (Rhodamine B) is used to decelerate 0.03 γ Tl dans 500 ml d'eau.

TL;DR: In this paper, a new "heterometric" method was used for the determination of iron, aluminium and chromium, and two of the metals can be determined separately in mixtures.

TL;DR: In this article, the vague anodique de depolarisation du Hg+2 par le complexon (acide ethylenediaminetetracetique) a ete trouvee proportionnelle a la concentration en.

TL;DR: In this paper, Triphenylmethylarsonium thiocyanate (THI) was used for colorimetric micro-estimation of cobalt with an accuracy of about 2%.

TL;DR: In this article, the effect of substitutions in the 4,4', 4” carbon position of terpyndine on the molecular extinction coefficient and the wavelength of maximum absorption lmax was investigated.

TL;DR: In this paper, the use of n -octanol as extracting solvent has been employed in a new procedure whereby 1, 10-phenanthroline provides a simultaneous separation and spectrophotometric determination of both iron and copper when present together.

TL;DR: The simultaneous volumetric determination of zinc and magnesium using disodium dihydrogen ethylenediamine tetra-acetate (complexone III) is detailed in this paper, where selective control of the pH at 6.8 enables zinc alone to be titrated, whilst magnesium is subsequently titrated at pH 10 on the same solution.

TL;DR: The reaction between thorium and Complexone III (disodium salt of ethylene-diaminetetra-acetic acid) at pH 2.8-4.3 has been developed to a quantitative method as mentioned in this paper.

TL;DR: In this article, it has been shown that molybdenum can be precipitated quantitatively by adding excess of concentrated ammonium sulphide to a molydate solution and then decomposing the thiosalt with excess of hydrochloric acid.

TL;DR: It has been shown that pentavalent antimony can be precipitated quantitatively by decomposing its thiosalt with a large excess of 2N hydrochloric acid and weighed as Sb2S5 2.1.

TL;DR: In this article, a sensitive spectrophotometric procedure was developed for the determination of small amounts of platinum, based upon the measurement of the strong ultraviolet absorption maximum at 262 mμ which is characteristic of the PtCl 6 -2 ion.

TL;DR: In this article, it was shown that the complete precipitation of arsenic sulphide by decomposing the thiosalt provides a, lemarkably convenient and rapid method for its estimation which is in marked contrast to the tedious methods so far available for this purpose.

TL;DR: In this paper, the conditions for polarography were laid down and the theoretical aspects of the results obtained with a single-sweep cathode ray polarograph are discussed, and the mutual interference of the elements is detailed and recommendations for their determination in the presence of one another.