Showing papers in "Analytica Chimica Acta in 1972"

TL;DR: In this article, a spectrophotometric method for the determination of arsenite, arsenate, and phosphate in fresh and salt waters is presented, using an oxidizing and a reducing reagent.

TL;DR: In this article, the concept of metal buffers and their use for calibration, testing and comparison of ion-selective electrodes is described and a series ofcopper(II) buffers has been prepared and used for intercomparison of a newly developed copper(II)-selectrode with corresponding Orion, Beckman and Radiometer solid-state membrane copper-II-selectively electrodes.

TL;DR: A method is described for multi-element analysis in which microlitre samples of solutions of inorganic and organic materials are used for the determination of trace elements in oil, organic compounds and blood.

TL;DR: In this article, the graphite atomizer has been evaluated for direct injection analysis of sea water for trace transition metals and was found to be impossible due to the scattering interference of the major salts.

TL;DR: In this article, an instrumental assembly is described which permits detection of the atomic emission at their resonance lines below 200 nm from sulphur and phosphorus introduced into a high-frequency induction-coupled plasma source as aqueous solutions of their anions.

TL;DR: In this article, the concept and construction of a multipurpose electrode, the selectivity of which can easily be changed, is described and the change of electrode response is achieved by using various electroactive materials, which can be either solid (solid-state selectrode) or liquid (liquid-state Selectrode).

TL;DR: The diazotization-coupling reaction for the determination of nitrite is modified and adapted for micro-analysis of blood and plasma and the results showed high reproducibility.

TL;DR: The biprotonic process in methyl salicylate is complete, during the lifetime of the excited state in moderately concentrated acid solutions but is incomplete in dilute acid media.

TL;DR: In this article, a new lead-seleclive heterogeneous membrane electrode was prepared by hot-pressing a mixture of lead and silver sulfides with polythene in a thermomoulding press.

TL;DR: A series of electrodes with membranes of silver sulphide have been prepared and their standard potentials and their response to sulphide and silver ions are measured and compared with those of a single-crystal silver sulfide electrode as discussed by the authors.

TL;DR: In this article, the synthesis details and characterisation of some alkaline earth chelates of fluorinated alkanoylpivalylmethanes are given, and the mass spectra of the calcium, strontium and barium compounds exhibit peaks due to polymeric ions.

TL;DR: In this article, a method for the pulse-polarographic determination of copper, lead, cadmium, nickel, zinc and cobalt in natural waters, after their preconcentration on chelating resin in its calcium form, was described.

TL;DR: In this article, the melting points, carbon-hydrogen analyses, and infrared and n.m. absorption data of metal chelates of dipivaloylmethane were obtained.

TL;DR: A method is described for the neutron activation analysis or arsenic and antimony simultaneously in biological materials at submicrogram level, based on the differences in the extraction behaviour of the iodides from sulphuric acid-potassium iodide medium with toluene.

TL;DR: In this article, the stability of the reagent curcumin (H3A) in sulphuric acid-acetic acid medium both in the presence and absence of boric acid has been studied.

TL;DR: In this paper, a method for the calculation of the stability constants of chelate complexes from pH and pM values is presented, which is based on a consistent use of side reaction coefficients, is applicable also to systems containing a large number of complexes.

TL;DR: In this paper, a rapid method for the determination of tungsten in soils, stream sediments, rocks and vegetation with dithiol is described, where samples are fused with potassium hydrogensulphate before leaching with concentrated hydrochloric acid.

TL;DR: The feasibility of using TBP-loaded polyurethane foams as column fillings in reversed-phase chromatography was examined and their capacities were determined as mentioned in this paper, where the effect of flow-rate, temperature and ratio of the separated ions on the efficiency of separation was tested.

TL;DR: In this paper, the principles of the application of catalyzed reactions for the indication of end-points in titrimetric analysis are discussed, and some newer examples are given for this type of titration.

TL;DR: In this article, the authors used an r.f. carbon rod atomizer and by pumping the monochromator with argon : the sensitivity was 0.1 μg Hg m-3.

TL;DR: In this paper, the history of the Salet phenomenon is summarized and various experimental configurations are studied for the measurement of the S2 and HPO emission from different sulfur and phosphorus species in low-temperature flames.

TL;DR: The effects of solvent polarity and hydrogen-bonding capability on the fluorescence of 3-aminoquinoline have been studied in this article, showing that 3-Amino-quinoline is a stronger acid in the excited state than in the ground state with respect to dissociation from the amino group.

TL;DR: In this article, the results of the extraction of fourteen different quaternary cations with nineteen different anions into four different solvents were discussed in terms of the effects of the cation, the anion and the organic solvent on the distribution ratio.