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This paper reports the concentration of some dissolved organic phosphorus insecticides in water by open-cell polyurethane foam. The results of preliminary screening tests on the retention of the tested insecticides (Diazinon, Malathion and Chloropyrifos) by polyester foams indicated that a very high percent removal of the insecticides was obtained. The retention rate was fast and reaches equilibrium...
In this paper two simple configurations for sample illumination using a charge-coupled device (CCD) detector have been shown. The choice of an appropriate sample illumination can be crucial to obtain spatial and spectral information of complex samples. It is demonstrated that simultaneous Raman spectra of a heterogeneous sample of three compounds can be obtained using a vertical sample illumination...
A new method for determining 34 S: 32 S ratios using Fourier transform infrared spectroscopy has been developed. The four sulphur-containing gases SCO, H 2 S, SF 6 and SO 2 are assessed as possible compounds for the spectroscopic measurements, from which, after a consideration of available lines showing a clear isotopic shift and also of possible...
The polarographic and voltammetric behaviour of the copper(II)-mitoxantrone complex have been studied. A well-defined linear sweep voltammetric peak was obtained at -0.275 V (vs. Ag/AgCl) or -0.325 V (vs. SCE) in ammonia-ammonium chloride (20 mmol l -1 , pH 9.0). The characteristics of the peak have been examined in detail. The experimental results show that the reduction of the copper(II)...
A novel glassy carbon electrode design, permitting medium exchange in batch mode without loss of electrode potential control, has been used for the study of copper(I) and copper(II) species formed during constant current stripping oxidation of copper in chloride media. It was found that copper(II) species dominated at chloride concentrations below about 1 mM and that soluble copper(I) species dominated...
Macrolide antibiotics such as erythromycin, oleandomycin, spiromycin, and tylosin are found to react with Fe 3+ in the presence of an acetic acid-sulfuric acid mixture to form a colored product having a useful absorption band at 592 nm. Troleandomycin forms only a weakly colored product upon reaction. The molar absorptivity is about 2900 1 mol -1 cm -1 for...
Two novel biosensors for urea based on immobilized corynebacterium glutamicum 617 and corynebacterium glutamicum ATCC13032 in calcium alginate gel coupled with an ammonia gas-sensing electrode, were designed and constructed. Calibration plots of measured potential difference (mV) vs. log of urea concentration were linear in the range of 5.6 10 -5 - 1.4 10 -2 and 5...
A fractal analysis is presented for the binding of pyrene in solution to β-cyclodextrin attached to a fiber-optic chemical sensor. The specific (k 1 ) and non-specific binding rate coefficients and the fractal dimension (D f ) (specific binding case only) both tend to increase as the pyrene concentration in solution increases from 12.4 to 124 ng ml -1 . Predictive relations...
A series of experiments was undertaken to measure the recovery efficiency of platinum, palladium and gold from silicate rocks using a sodium peroxide fusion followed by anion exchange separation of the analytes as chloro complexes. Results obtained by graphite furnace atomic absorption spectrometric analysis of standard solutions prepared in dilute HCl or HCl-acidified sodium peroxide solution showed...
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