Evaluation of ammonium fluoride for quantitative microwave-assisted extraction of silicon and boron from different solid samples

Husáková, Lenka; Urbanová, Iva; Šídová, Tereza; Cahová, Tereza; Faltys, Tomáš; Šrámková, Jitka

doi:10.1080/03067319.2015.1070409

Cited by 12 publications

(8 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have reported previously [49,61] that ammonium fluoride is able to impact effectively both silicate and alumina matrix. If ammonium fluoride or ammonium hydrogen fluoride are the reagents, different reaction products such as oxides, hydroxides, salts, etc.…”

Section: Selection Of Extraction Agentmentioning

confidence: 98%

“…The microwave-assisted extraction of samples was carried out in Speedwave TM MWS-3 + (Berghof, Germany) microwave system with the maximum total output of the microwave generator 1450 W. The sample throughput of the MWS-3 + system was increased by using the Multitube System (MT) employed with the DAC-100S digestion vessels [49]. This arrangement allows simultaneous extraction/digestion of three samples in one DAC-100S PTFE vessel by placing three MT PFA tubes into each of the vessels.…”

Section: Experimental Instrumentationmentioning

confidence: 99%

“…The analysis by flame atomic absorption/emission spectrometry for the determination of Na, K, Ca, Fe, Si and Mg, respectively was performed using the same way as described previously [49,56].…”

Section: Reagents and Standardsmentioning

confidence: 99%

“…For ammonium fluorides, both in the anhydrous state or in the aqueous solution, the formation of ammonium fluorometallates or oxofluorometallates was reported [62]. The resulting products are in contrast to those obtained with HF more thermally stable [49,62], NH 4 F is also significantly less toxic than HF, which is a requirement for the replacement of the hydrofluoric acid with all their handicaps and the utilization of NH 4 F in a sample preparation step. When the experimental conditions employing a closed vessel microwave-assisted extraction with the use of NH 4 F as an extractant are used, Si and B can be quantitatively determined in various environmental samples [49].…”

Section: Selection Of Extraction Agentmentioning

confidence: 99%

“…However, this problematics is much more complex and the final reaction products, which will be created, are strongly dependent on the conditions of the experiment [47,48]. The addition of H 3 BO 3 [24,36] may solve some drawbacks being attributed to the use of HF, but the addition of H 3 BO 3 increases the salinity of the sample, the price of the analysis and disables the determination of boron in the sample [49].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Simultaneous Determination of 11 Elements in Fly Ash by Inductively Coupled Plasma Orthogonal Acceleration Time-of-Flight Mass Spectrometry After Closed-Vessel Microwave-Assisted Extraction with Ammonium Fluoride

et al. 2018

Self Cite

View full text Add to dashboard Cite

A method for simultaneous multi-element analysis of fly ash samples by inductively coupled plasma orthogonal acceleration time-of-flight mass spectrometry (oaTOF-ICP-MS) after closedvessel microwave extraction with ammonium fluoride was introduced here. Corrosive and and/or toxic acids like HF, HCl or HClO 4 , as well as HNO 3 , which are commonly used during sample preparation of the fly ash samples are avoided in this method. The spectral effects due to the formation of different Cl, Na, K, Ca, Mg, containing polyatomic species interfering the determination of number of elements like As, Se or Ni during the oaTOF-ICP-MS analysis are negligible. Under the optimum experimental extraction conditions evaluated using a fractional factorial design being 10 mg of the sample extracted with 5 mL of 140 g L −1 NH 4 F for 10 min at 200 °C, subsequent analysis of the resulting supernatant enabled under optimum instrumental conditions and with Rh as an internal standard precise and accurate simultaneous determination 2 of 11 elements (Li, Be, Ni, As, Se, Rb, Sb, Cs, W, Tl and U) at trace and ultra-trace levels. The accuracy was assessed by analysing two certified reference materials, namely Fine Fly Ash CTA-FFA-1 and Constituent Elements in Coal Fly Ash Standard Reference Material ® 1633b. The precision of the reported method was better than 10 %.

show abstract

Section: Selection Of Extraction Agentmentioning

confidence: 98%

Section: Experimental Instrumentationmentioning

confidence: 99%

Section: Reagents and Standardsmentioning

confidence: 99%