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The determination of total reduced sulfur, elemental sulfur, sulfide, thiosulfate and sulfite in porewaters - which were previously extracted from surface sediments collected in three bays, i.e. Seine, Fresnaye and Authie located in northern France - has been undertaken using different electroanalytical techniques (linear sweep cathodic stripping voltammetry (LSCSV), square wave cathodic stripping...
The interactions between some acrylic and sulphonic polyanions and some protonated amines (diamines NH 2 -(CH 2 ) x -NH 2 , x=2,...,10; linear tri-, tetra-, penta- and hexa-amines) were studied potentiometrically in aqueous solution, at 25 o C. For both types of polyanions AL 2 H i (L - , monomer of polyanion, A, amine) species are formed,...
A new method based on separation with gas chromatography and detection with a quartz crystal microbalance was used for quantification of nitrobenzene, 2-, 3- and 4-nitrotoluene in landfill gas. The analytical error, the analysis time and general analytical performance were identical for gas chromatography-mass spectrometry (GC-MS) and gas chromatography-quartz crystal microbalance (GC-QCM). GC-QCM...
Simultaneous determination of Fe(II) and Fe(III) or selective determination of each oxidation state of iron in the presence of the other one by H-point standard addition method (HPSAM) is described. Mixed reagents of 1,10-phenanthroline and salicylic acid was used as a selective chromogenic system for speciation of Fe(II) and Fe(III). It was shown that with appropriate selection of wavelength pairs,...
A new procedure is described for the determination of NiS in a carbon paste electrode (CPE) by cathodic stripping voltammetry in pH 5 acetate. The method was developed with both synthetic NiS and millerite. A cathodic scan from +0.3 to -0.8 V with accumulation at +0.3 V for 60 s gave rise to a cathodic peak at ca. -0.5 V for NiS measurement. This cathodic peak was traced to the reduction of a sulfur-rich...
The synthesis and analytical applications of N,N'-bis(2-hydroxy-5-bromo-benzyl)1,2 diaminopropane (HBDAP) are described. This compound reacts with Fe(III) in the range of pH 3-6 to produce a red complex (2:3 mol ratio of Fe(III)/HBDAP) soluble in chloroform. The investigation included a study of the characteristics that are essential for solvent extraction and for spectrophotometric determination...
Application of CAT (computer-assisted target factor analysis) for quality assessment and quality control in spectroscopy is demonstrated. As a working example, interaction of polyoxometalates (POM) with neodymium in aqueous solutions is followed by UV-Vis spectroscopy. CAT is combined with Monte Carlo and resampling techniques (i.e. threshold bootstrap methods) in order to capture the complete distribution...
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