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The use of fractional factorial design for optimization of direct determination of Be in soil and sediment samples by HR-CS-ET-AAS with slurry sampling
Authors: Husáková Lenka | Šafránková Michaela | Urbanová Iva | Šídová Tereza
Year: 2016
Type of publication: ostatní - článek ve sborníku
Name of source: Czech Chemical Society Symposium Series
Publisher name: Česká společnost chemická
Place: Praha
Page from-to: 281
Titles:
Language Name Abstract Keywords
eng The use of fractional factorial design for optimization of direct determination of Be in soil and sediment samples by HR-CS-ET-AAS with slurry sampling In this work an efficient design methodology is presented for developing a simple, fast, and environmentally-friendly method for the determination of Be in soil and sediment samples using direct solid sampling high-resolution continuum source electrothermal atomic absorption spectrometry (HR-CS-ET-AAS). A fractional factorial design1,2 was employed to assess the influence of seven analytical variables (partical size, concentration of stabilizing agent and extractant, effect of ultrasonic agitation, concentration of chemical modifier, pyrolysis and atomization temperature) onto the analyte signal and for the development of the slurry preparation and optimization of measuring conditions. Under the optimum conditions, the proposed method has been successfully applied to the determination of Be in two certified reference materials (NIST SRM 2702 Inorganics in Marine Sediment and IGI BIL-1 Baikal Bottom Silt). The method accuracy was in addition assessed by comparing the results obtained for ten real samples by slurry sampling with those obtained following microwave-assisted extraction by inductively coupled plasma time of flight mass spectrometry (TOF-ICP-MS); no statistical differences, based on a t-test at a confidence level of 95 %, were detected. The reported method has a precision better than 7 %. Characteristic mass and limit of detection for the original sample was 17 pg and 0.016 mg kg-1, respectively.

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