Showing papers in "Analytica Chimica Acta in 1986"

TL;DR: In this paper, a tutorial on the Partial Least Squares (PLS) regression method is provided, and an algorithm for a predictive PLS and some practical hints for its use are given.

TL;DR: A completely model-free method for the resolution of overlapping chromatographic peaks by exploiting the additional information contained in the response data through the intrinsic order of the elution time.

TL;DR: In this article, an AT-cut quartz piezoelectric crystal, oscillator and frequency counter was used to detect C. albicans in the range 106−5 × 108 cells cm−3.

TL;DR: In this paper, practical examples with simulated data are described to illustrate the material described in the preceding tutorial on partial least-squares regression, starting from the perfect model for two dimensions, noise, nonlinearities and interference are added gradually in order to study their influence.

TL;DR: A comprehensive survey of the application of Kalman filtering to chemical problems is provided in this article, with a focus on the discrete Kalman algorithm and its application in analytical chemistry. But, as discussed in this paper, it is based on the Kalman filter, a recursive, linear digital filter originally developed for use in navigation, but now used in many fields.

TL;DR: The least median of squares (LMOS) method as mentioned in this paper is a robust regression method that is not sensitive to outliers or other violations of the assumption of the usual normal model.

TL;DR: The UNEQ method can be very useful for classification purposes but requires the populations to be homogeneous as is the case for other techniques.

TL;DR: In this article, a review is given of the principles, key developments and representative applications of small electrodes in flow-through electrochemical (ec) detectors having very low effective dead volume.

TL;DR: In this article, the change in fluorescence intensity of a buffered pH indicator solution entrapped in silicone rubber is measured via an optical fibre bundle, and the effects of sensor preparation and buffer composition on response time, reversibility and sensitivity are discussed.

TL;DR: A comprehensive review of manual commutation techniques for difference injection procedures is given in this article, where an alternative stopping-flow approach without stopping the pump is suggested, as well as the use of commutation for different injection procedures (loopbased, time-based, hydrodynamic, sequential and nested injection) is emphasized.

TL;DR: In this article, a technique for polishing the surface of carbon-fiber ultramicroelectrodes to a bevelled tip is described, which simplifies electrode preparation.

TL;DR: In this paper, a submersible chemical analyzer (SCANNER) is developed which can perform analyses in situ in the ocean using a modified flow-injection system and is used to automate virtually any spectrophotometric determination that can be done by flow injection analysis.

TL;DR: In this article, an enzyme electrodes was used for glucose determination in unstirred, undiluted whole blood, and the system comprises an H2O2-detecting electrode upon which is placed a membrane laminate incorporating glucose oxidase.

TL;DR: In this article, the synthesis of aquocyanocobalt(III)-hepta(2-phenylethyl)-cobyrinate is described, which is a more lipophilic substitute for a previously reported nitrite-carrier.

TL;DR: In this article, a simple and rapid method is proposed for the determination of copper, zinc and iron in whole blood, where the injected sample is mineralized in the flow system on passage through a microwve oven and the metals are determined by atomic absorption spectrometry.

TL;DR: In this paper, two important advances in methodology for LEED crystallography have been described, one is experimental and concerns the rapid acquisition of LEED intensity data from display-type equipment with a computer-assisted television camera.

TL;DR: Direct-current cyclic voltammetry is used to investigate the suitability of a ferrocene derivative as a mediator with galactose, glycolate and l-amino acid oxidases, and should be widely applicable to oxidases and other oxidoreductase enzymes.

TL;DR: In this article, a method based on the retention of inorganic ions by water-soluble polymeric reagents (liquid phase polymer-based retention) in a membrane filtration cell is suggested for the separation and preconcentration of various elements.

TL;DR: In this article, a special type of substrate for surface-enhanced Raman scattering (s.r.s.) is evaluated, which consists of silver particles deposited on stochastically arranged SiO2 posts produced by plasma etching of a quartz surface using a silver island film as an etch mask.

TL;DR: Some 804 papers on flow injection analysis published to the end of May 1985 are summarized in this article, where past trends are discussed and new developments are briefly outlined, and important concepts and technological innovations are reviewed and the future development of f.i.a. is briefly outlined.

TL;DR: In this article, the authors used 1,2-dihydroxyanthraquinone-3-sulphonic acid (DASA) on the hanging mercury drop electrode.

TL;DR: In this article, Lactate oxidase from Pediococcus species can be rapidly and simply immobilized on a commercially available preactivated membrane fixed to an amperometric probe detecting hydrogen peroxide, to provide a very sensitive practical l -lactate sensor.

TL;DR: Combinations of flow-injection techniques with flame atomic absorption spectrometry (a.a.s.) and inductively-coupled plasma/atomic emission spectrometers (i.c.p.s) are reviewed in the general context of agricultural and environmental analysis.

TL;DR: In this article, an electrode-based flow-injection system for the direct determination of salicylic acid is described, which utilizes a tubular polymer membrrane electrode based on manganese(III) tetraphenylporphyrin chloride to sense salicylate ions formed in a recipient buffer solution held within the upper channel of a flow-through membrane dialyzer assembly.

TL;DR: Acetylcholine and choline sensors are prepared by immbilizing enzymes on nylon net attached to a hydrogen peroxide snsor and protected with an acetate cellulose membrane to enhance selectivity.

TL;DR: Bolus shapes for injected samples have been calculated for times of interest in experiments on flow injection analysis and the effect of both system and molecular parameters on the shapes and the dispersion of samples is considered.

TL;DR: In this article, a glucose sensor is prepared by adsorption of the mediator Meldola blue (N,N-dimethyl-7-amino-1,2-benzophenoxazinium ion, as well as glucose dehydrogenase, on the surface of a carbon electrode.

TL;DR: Preconcentration by dithiocarbamate extraction into 2-ethylhexyl acetate for simultaneous determination of trace elements in natural water is described in this article, where the organic phase is used directly for inductively-coupled plasma atomic emission spectrometry.

TL;DR: In this article, a method for the measurement of 67Zn/6*Zn and 70ZN/68Zn ratios by inductively coupled plasma/mass spectrometry with ultrasonic nebulization is described.