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1

Chemometric Analysis of Grapes

100%

Ranđelovic S. S., Kostic D. A., Arsic B. B., Mitic S. S., Rasic I. D., Mitic M. N., Dimitrijevic D. S., Stojanovic G. S.

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issue 1

EN

Concentrations of several heavy metals in soil, water and grape samples (variety Plovdina) collected at five locations at different distances from the road in Southeast Serbia were determined using the Flame Atomic Absorption Spectrophotometry. There was a decrease in analyzed samples with an increase in distance from the road. A complete absence of several examined, very harmful heavy metals (Mn, Ni, and Cd) in all analyzed samples was found. The analysis of grape samples proved the presence of iron, zinc and copper in concentration ranges 3.3-19.8, 0.31-0.63, and 3.4-13.6 μg g-1, respectively. The content of heavy metals in soil, water and grapes were below allowable limits. Correlation analysis showed a significant relationship between the concentrations of metals in soil and grape samples.

2

Principal component analysis in interpretation of the results of HPLC-ELC, HPLC-DAD and essential elemental contents obtained for medicinal plant extracts

100%

Konieczynski P.

Open Chemistry

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2013

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vol. 11

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issue 4

519-526

EN

Principal component analysis (PCA) was applied to compare its usefulness with cluster analysis (CA), and factorial k-means analysis (fkm), for evaluating the results obtained using HPLC-DAD, HPLC-ELC and spectroscopic techniques (AAS and UV/VIS spectrometry for determining content of N, P, Fe and Cu) in aqueous extracts of seven medicinal plants. These represented the following plant species that are rich in flavonoids: Betula verrucosa Ehrh., Equisetum arvense L., Polygonum aviculare L., Viola tricolor L., Crataegus oxyacantha L., Sambucus nigra L. and Helichrysum arenarium (L.) Moench. The databases analyzed comprised four sets: 1) results obtained by the use of HPLC-DAD detection, 2) results obtained by the use of electrochemical detection (HPLC-ELC), 3) results for determining elements - total and water-extractable species, and 4) all data combined. Application of statistical methods allowed the samples to be classified into four groups: 1) Crataegus, Sambucus, 2) Equisetum, Polygonum and Viola, 3) Betula, and 4) Helichrysum, which were differentiated by characteristic patterns. PCA supported by CA, was the most suitable method, because it simultaneously allowed for reduction of multidimensionality of the databases, grouped the samples into four clusters, and made possible selection of the factors responsible for differentiation of the plant materials studied. [...]

3

Application of ICP-MS and various computational methods for drinking water quality assessment from the Silesian District (Southern Poland)

88%

Skorek R., Jablonska M., Polowniak M., Kita A., Janoska P., Buhl F.

Open Chemistry

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2012

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vol. 10

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issue 1

71-84

EN

In this study, more than 200 samples of drinking water from taps in the Silesian District (southern Poland) were analyzed. Concentrations of As, Bi, Cd, Co, Cr, Mo, Ni, Pb, Rb, Sb, Se, Te, Tl and V were measured using inductively coupled plasma-mass spectrometry technique (ICP-MS). The levels of the tested elements generally met European Union regulations. All analytical results were processed using computational methods, including the Pearson and Gini coefficients with the Lorenz curves, one-way ANOVA, the Kruskal-Wallis one-way analysis of variance, the Mann-Whitney U test, the variance correlation test and the Spearman’s test. In addition, Principal Component Analysis (PCA) with Varimax and Cluster Analysis with Ward’s Method were applied. It was shown, that some parameters (e.g. hardness and alkalinity) were highly correlated. The score plot described the degree of mineralization of water samples, so the origin of water could be easily determined. In turn, based on the created dendrogram, the division of samples into several groups (with soft, medium and highly mineralized water) could be deduced.

4

Magnitude Modelling of HRTF Using Principal Component Analysis Applied to Complex Values

88%

Ramos O. A., Tommasini F. C.

Archives of Acoustics

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2014

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vol. 39

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issue 4

5

A study on adsorption of metals by activated carbon in a large-scale (municipal) process of surface water purification

88%

Dabioch M., Skorek R., Kita A., Janoska P., Pytlakowska K., Zerzucha P., Sitko R.

Open Chemistry

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2013

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vol. 11

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issue 5

742-753

EN

Elements that enter the aquatic environment may pose a health risk to wildlife and humans. The aims of this study were: to determine how the introduction of activated carbon for a water purification system will improve the quality of the water produced; and to investigate the sorption of metals on activated carbons, including determination of the accumulation, as well as changes in concentrations of elements in carbons. The tests were carried out on three types of activated carbons with different granular structure. All samples were collected from Water Treatment Plant Goczalkowice, Poland. Concentrations of elements were measured using an optical emission spectrometer with inductively coupled plasma. The experiment showed that metals accumulating in the activated carbons during the operation included: Ca, Mn, Zn, and Cu. In each of the three types of carbons, it can distinguish such elements as Ba, Al, Cr, Ni, Ti, which are characterized by irregular accumulation during the operation of the filter. The introduction of carbon sorbent for water treatment largely contributed to improvement in the quality of raw material supplied to customers, mainly with regard to taste and smell, as well as to reduction of basic parameters: color, absorbance in the UV range and oxidability. [...]

6

GC-MS fingerprints of mint essential oils

75%

Hawrył M. A., Skalicka-Woźniak K., Świeboda R., Niemiec M., Stępak K., Waksmundzka-Hajnos M., Hawrył A., Szymczak G.

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issue 1

EN

Essential oils from eleven Mentha species were obtained by Deryng hydrodistillation and analysed by GC–MS: 44 compounds were identified. The most abundant were menthone, isomenthone, menthol, carvone, piperitone oxide, D-limonene and eucalyptol. Chemometric similarity measures and principal component analysis were calculated, allowing comparisons based on secondary metabolite content. The fingerprints may be helpful in chemotaxonomy.

7

Chemometric Analysis of Heavy Metals Coexistence in Different Plant Matrices in The Upper Silesian Industrial District / Analiza Chemometryczna Metali Ciężkich Pochodzących Z Różnych Matryc Roślinnych Z Terenów Górnośląskiego Okręgu Przemysłowego

71%

Pieszko C., Sajdak M.

Ecological Chemistry and Engineering S

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2013

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vol. 20

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issue 1

79-91

EN

Contents of Zn, Cd, Ni, Mn, Cu, Pb and Fe in 36 samples of Scots pine collected in 9 sites located in the Upper Silesia Province have been determined using AAS technique. The samples were digested before the analysis. On the basis of cluster analysis the existence of links between the quantitative composition, the sampling sites and the type of the matrix have been found. The coexistence of certain groups of elements was found and described.

PL

Oszacowano stężenia Zn, Cd, Ni, Mn, Cu, Pb, Fe, w 36 próbkach sosny zwyczajnej pobranych w 9 punktach umieszczonych na terenie województwa śląskiego. Mineralizaty były badane na zawartość wyżej wymienionych pierwiastków przy zastosowaniu AAS. Największe stężenie oznaczanych analitów stwierdzono w Jaworznie. Na podstawie analizy skupień stwierdzono istnienie powiązań pomiędzy składem ilościowym a miejscami pobrania próbek oraz typem matrycy, a także stwierdzono i opisano współwystępowanie obok siebie określonych grup pierwiastków

8

Relations between photosynthetic pigments, macro-element contents and selected trace elements accumulated in Lolium Multiflorum L. exposed to ambient air conditions

63%

Borowiak K., Budka A., Hanć A., Kayze D., Lisiak M., Zbierska J., Barałkiewicz D., Iwaniuk D., Łopatka N.

Acta Biologica Cracoviensia s. Botanica

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2018

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vol. 60

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issue 1

Refine search results

Chemometric Analysis of Grapes

Principal component analysis in interpretation of the results of HPLC-ELC, HPLC-DAD and essential elemental contents obtained for medicinal plant extracts

Application of ICP-MS and various computational methods for drinking water quality assessment from the Silesian District (Southern Poland)

Magnitude Modelling of HRTF Using Principal Component Analysis Applied to Complex Values

A study on adsorption of metals by activated carbon in a large-scale (municipal) process of surface water purification

GC-MS fingerprints of mint essential oils

Chemometric Analysis of Heavy Metals Coexistence in Different Plant Matrices in The Upper Silesian Industrial District / Analiza Chemometryczna Metali Ciężkich Pochodzących Z Różnych Matryc Roślinnych Z Terenów Górnośląskiego Okręgu Przemysłowego

Relations between photosynthetic pigments, macro-element contents and selected trace elements accumulated in Lolium Multiflorum L. exposed to ambient air conditions