doi: 10.1080/00032718408065290pmid: N/A
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
Stella, R.; Ganzerli Valentini, M. T.; Borroni, P. A.
doi: 10.1080/00032718408065291pmid: N/A
Abstract A sequential chelometric determination of copper (II) and iron (III) is reported utilizing copper (II) ion-selective electrode (Cu-ISE) for detecting end points and Gran's plots for extending sensitivity to the level of 0.4 umole in 100 mL for each metal. A modified procedure is also suggested and described for samples in which interfering divalent ions, such as zinc (II), are present. Practical applications are reported.
Deano, Paula M.; Robinson, J. W.; Gale, Robert J.
doi: 10.1080/00032718408065292pmid: N/A
Abstract We recommend that attention be given to the possibility of sample contamination in trace level electrochemical experiments when classical aqueous oxygen scrubbers are used. Although fresh electrolyte or water pre-saturators can be used to minimize ion carryover by aerosol spray, mercury vapor is still present in the gas stream. Many electrochemists now use solid catalysts (such as BASF R3-11, Badische Anilin and Soda-Fabrik), and their use, or that of pre-purified gases, are recommended to avoid such problems with purge gases in trace electroanalyses.
doi: 10.1080/00032718408065293pmid: N/A
Abstract A novel method, called “pyromineralization,” has been developed for the determination of heavy metals in biological samples at ppb and ppm levels. The generic term “mineralization” refers to a pretreatment aimed at transferring trace metal constituents of samples which are insoluble in water quantitatively into aqueous solution obviating any contamination. The sample was dissolved at 470°C in a LiCl-KCl eutectic melt under a flowing supernatant atmosphere of oxygen and gaseous hydrochloric acid. Subsequent cooling to room temperature and dissolution in an appropriate volume of water yielded a supporting electrolyte containing 2.5 M alkali chloride, which was ideally suited for the quantitation of copper, lead, cadmium, zinc, chromium, manganese, nickel, and cobalt in sewage sludge specimens by differential pulse polarography and anodic stripping voltammetry.
Bush, B.; Smith, R. M.; Narang, A. S.; Hong, Chia-Swee
doi: 10.1080/00032718408065294pmid: N/A
Abstract The sensitivity of a detector which combines UV photolysis with electrical conductance measurement of the photolysis products was evaluated for determination of common pollutants by high-performance liquid chromatography. Compounds which have both a UV chromophore compatible with either of the photolysing lamps (214 or 254 nm) and a hetero-atom which will produce an ion on photolysis were detected at sensitivity of <10 ng.
doi: 10.1080/00032718408065295pmid: N/A
Abstract A simple method involving ion chromatography with ultraviolet detection (IC-UV) is applied to the determination of benzoic acid in atmospheric samples. The detection limit is 10 nanograms. Validation and interference studies are described. The application of the IC-UV method to other aromatic acids including nitrophenols is briefly discussed.
Korany, Mohamed A.; El-Din, Ahmed A. Seif; Abael-salam, Naoil A.
doi: 10.1080/00032718408065296pmid: N/A
Abstract A rapid and simple method for determining eugenol, thymol and anethole in volatile oils is presented. These oils are diluted with ethanol and their respective constituents are directly determined by measuring peak-through amplitudes of the generated second derivative spectra at certain wavelengths. The results obtained are reasonably reproducible with a coefficient of variation less than 2%.
Salinas, F.; de la Peña, A. Muñoz; Murillo, J. A.
doi: 10.1080/00032718408065297pmid: N/A
Abstract The Complex formed between 1-hydroxy-2-carboxyanthraquinone and yttrium(III) has been studied spectrofluorimetrically in an ethanolic-water medium (70/30% V/V) at pH = 3.6. A very sensitive method for the spectrofluorimetric determination of yttrium traces is proposed (λex = 465 nm, λem = 580 nm), for concentrations between 0.01 and 0.8 μg.ml−1. The stoichiometry of the complex is 1:1.
López-fernández, M. A.; Gómez-hens, A.; Pérez-bendito, D.
doi: 10.1080/00032718408065298pmid: N/A
Abstract A kinetic fluorimetric method is described for the first time for the determination of microamounts of nickel (II) which is based on the catalytic effect of this ion on the oxidation of pyridoxal hydrazone by potassium peroxidisulphate. The reaction is followed by measuring the rate of change in the fluorescence of the oxidation product (λex 315, λem 370 nm). The calibration graph is linear in the 50–300 ng Ni mL−1 range. The analytical properties of the reagent are also described and the kinetic parameters of the reaction are reported.
Rao, R. Reghunadha; Khopkar, Shripad M.
doi: 10.1080/00032718408065299pmid: N/A
Abstract Niobium was quantitatively extracted at pri 3-4.5 with 0.08 M Amoerlite LA-2 in xylene from 0.02 M malonic acid. It was stripped from the organic phase with 0.25 M potassium carbonate solution and was determined spectrophotometrically with TAR at 540 nm. Apart from Amberlite LA-2, Primene JM-T quantitatively extracted niobium and xylene were the only satisfactory dilutents. Wiobium was separated from various elements which formed weak complexes with malonic acid by stripping these elements before extraction of niobium. By the process of selective stripping it was separated from elements forming strong complexes. The method was used for the determination of niobium from stainless steel.
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