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Sono-extraction as a pretreatment approach for the screening evaluation of element mobility of sediment samples

100%

Blašková J., Vojteková V., Nováková J., Mackových D., Bazeľ Y., Lapčík L., Poperníková Z., Abusenaina A.

Open Chemistry

2013

vol. 11

issue 7

1201-1212

Application of economically important and time saving pretreatment for the screening element mobility evaluation of contaminated sediments is presented. Ultrasonically-assisted single-step extraction (USAE) was carried out by EDTA solution. The extraction time of USAE was optimized and obtained results were compared with results estimated by conventional (EDTA extraction) and by sequential extraction (modified BCR protocol). The original three step BCR protocol was modified by addition of the first step (water leaching) and the fifth step, total digestion of sediment residue (acid mixture with HF). Zn, Cu and Pb have been determined in extracts by ICP-OES. Good conformity of the ultrasonically-extracted element contents and sum of contents, extracted during first three steps (water-soluble, acid-extractable, reducible - i.e., the most mobile fractions) of sequential extraction, was found. The sono-extraction reduced operating time of the first three steps of sequential extraction from 48 h to 15 min. Thus, USAE can serve as a rapid screening assessment of the mobile and potentially mobile element portions in sediments and other similar solid state environmental media. Analytical quality control was realized by comparison of the sums of element contents obtained at individual (five) extraction steps. Total element contents were also determined by an independent method (XRF).

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

2012

vol. 10

issue 1

71-84

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.

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2 Open Chemistry

1 2013

1 2012

1 Abusenaina A.

1 Bazeľ Y.

1 Blašková J.

1 Buhl F.

1 Jablonska M.

1 Janoska P.

1 Kita A.

1 Lapčík L.

1 Mackových D.

1 Nováková J.

1 Polowniak M.

1 Poperníková Z.

1 Skorek R.

1 Vojteková V.

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Sono-extraction as a pretreatment approach for the screening evaluation of element mobility of sediment samples

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