Transformation of a Free-Wilson Matrix into Fourier Coefficients

Holík, Miroslav; Halámek, Josef

doi:10.1002/1521-3838(200112)20:5/6<422::aid-qsar422>3.0.co;2-z

Cited by 5 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To obtain confidence ellipses [ 46 , 53 ], twelve samples of 10 μM CuCl 2 in 0.5M NaCl (pH 6) on PIGE at a scan rate of 100 mV/s ( Fig. 5A ) and twelve samples of 15 μM CuSO 4 in 0.05 M borax on Hg-PGEb (pH 9.2; thickness of Hg layer, 275nm) at a scan rate of 400 mV/s were measured ( Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Study of Copper and Purine-Copper Complexes on Modified Carbon Electrodes by Cyclic and Elimination Voltammetry

Trnková

Zerzánková

Dyčka

et al. 2008

Sensors

View full text Add to dashboard Cite

Using a paraffin impregnated graphite electrode (PIGE) and mercury-modified pyrolytic graphite electrode with basal orientation (Hg-PGEb) copper(II) and Cu(II)-DNA purine base solutions have been studied by cyclic (CV) and linear sweep voltammetry (LSV) in connection with elimination voltammetry with linear scan (EVLS). In chloride and bromide solutions (pH 6), the redox process of Cu(II) proceeded on PIGE with two cathodic and two anodic potentially separated signals. According to the elimination function E4, the first cathodic peak corresponds to the reduction Cu(II) + e- → Cu(I) with the possibility of fast disproportionation 2Cu(I) → Cu(II)+ Cu(0). The E4 of the second cathodic peak signalized an electrode process controlled by a surface reaction. The electrode system of Cu(II) on Hg-PGEb in borate buffer (pH 9.2) was characterized by one cathodic and one anodic peak. Anodic stripping voltammetry (ASV) on PIGE and cathodic stripping voltammetry (CSV) on Hg-PGEb were carried out at potentials where the reduction of copper ions took place and Cu(I)-purine complexes were formed. By using ASV and CSV in combination with EVLS, the sensitivity of Cu(I)-purine complex detection was enhanced relative to either ASV or CSV alone, resulting in higher peak currents of more than one order of magnitude. The statistical treatment of CE data was used to determine the reproducibility of measurements. Our results show that EVLS in connection with the stripping procedure is useful for both qualitative and quantitative microanalysis of purine derivatives and can also reveal details of studied electrode processes.

show abstract

Section: Resultsmentioning

confidence: 99%

“…where A j is amplitude of the curve at a particular point, m is total number of points which determines the curve, and the parameter k can take values from 0 to m [ 46 ]. The curve determined by m points with amplitude A is transformed into coordinates xf k and yf k .…”

Section: Methodsmentioning

confidence: 99%