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Acid digestion of geological and environmental samples using open-vessel focused microwave digestion
The application of open vessel focused microwave acid digestion is described for the preparation of geological and environmental samples for analysis using inductively coupled plasma-mass spectrometry (ICP-MS). The method is compared to conventional closed-vessel high pressure methods which are limited in the use of HF to break down silicates. Open-vessel acid digestion more conveniently enables the use of HF to remove Si from geological and plant samples as volatile SiF4, as well as evaporation-to-dryness and sequential acid addition during the procedure. Rock reference materials (G-2 granite, MRG-1 gabbros, SY-2 syenite, JA-1 andesite, and JB-2 and SRM-688 basalts) and plant reference materials (BCR and IAEA lichens, peach leaves, apple leaves, Durham wheat flour, and pine needles) were digested with results comparable to conventional hotplate digestion. The microwave digestion method gave poor results for granitic samples containing refractory minerals, however fusion was the preferred method of preparation for these samples. Sample preparation time was reduced from several days, using conventional hotplate digestion method, to one hour per sample using our microwave method. 相似文献
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Kažoka Helena Turovska Baiba Upmanis Toms Orlova Natalja Vorona Maksims 《Chromatographia》2021,84(7):663-675
Chromatographia - Our previous studies concerning the enantioseparation of 4C-substituted pyrrolidin-2-one derivatives on coated polysaccharide-based chiral stationary phases have shown that... 相似文献
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J. H. Bruun R. T. Leslie S. T. Schicktanz F. W. Toms C. P. Money 《Analytical and bioanalytical chemistry》1932,88(11-12):466-467
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F. Feigl L. Badian A. Schönberg W. Urban Th. Stolpp H. L. Donle G. Volkert O. Frehden V. Anger E. Rimini O. Baudisch L. W. Fass K. A. Hofmann O. Dieffenbach R. Zappert E. Koenigs H. Greiner P. Ehrlich C. A. Herter F. Kröhnke R. Fischer W. Paulus V. H. Morris J. V. Sánchez A. J. Bailey R. J. Robinson J. Böeseken P. Pols Jun H. Toms und E. Rossmann 《Fresenius' Journal of Analytical Chemistry》1936,106(3):112-125
Ohne Zusammenfassung 相似文献
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We report the addition of M–H bonds (M = Al, Zn, Mg) to a Rh(iii) intermediate generated from the reductive elimination of triethylsilane from [Cp*Rh(H)2(SiEt3)2]. A series of new heterobimetallic complexes possessing Rh–M bonds have been isolated and characterised by a number of spectroscopic (1H, 29Si, 13C, 103Rh NMR, infrared, and X-ray diffraction) and computational techniques (NBO and QTAIM analysis). Experimental and computational data are consistent with cleavage of the M–H bond upon addition to rhodium with formation of new Rh–M and Rh–H bonds. Upon photolysis the Al analogue of this series undergoes a further elimination reaction producing triethylsilane and a highly unusual Rh2Al2H4 containing cluster proposed to contain an Al(i) bridging ligand. 相似文献