caa a22 4500 46912931X CHVBK 20180323133159.0 cr unu---uuuuu 170328e19920701xx s 000 0 eng 10.1007/BF00321841 doi (NATIONALLICENCE)springer-10.1007/BF00321841 Zini Q. C.N.R. Istituto LAMEL — Sezione di Chimica, Via dell'Idraulico 17/2°, I-40138, Bologna, Italy aut Spectrofluorimetric determination of aluminium in silicon and in electronic grade reagents [Elektronische Daten] [Q. Zini] Summary: A sensitive spectrofluorimetric method is based on the complexation of Al with the dye Mordant Black 17 or Calcon (CI 15705). The complex solution in n-propyl alcohol (1.5×10−4 mol/l) is mixed (5:20) with 1 mol/l acetic acid — sodium acetate buffer (pH 4.8) and maintained at 40°C for 60 min. The fluorescence intensity is measured at Ex=565 nm, Em=610 nm: The calibration curve for Al was found to be linear in the range 0 to 60 ng×ml−1 with a standard deviation of σ=1.5 and an Al detection limit of 3 ng×ml−1. The interferences due to more than 40 ions were investigated; the presence of Fe3+, Cr3+, Co2+, Cu2+, Ti4+, VO2+, ZrO2+, WO 4 2− , MoO 4 2− , CrO 4 2− and particularly F−, must be avoided or masked during the determination of Al. The sample of silicon/silicon dioxide was treated with a mixture of conc. HF and HNO3 (2:1), followed by digestion and distillation at 90°C to eliminate the matrix as fluorosilicic acid. A small residue of AlF3 was decomposed with HClO4. In SiO2 anodized layers (25-250 μg) the minimum detection of Al was estimated to be 1018 At×cm−3, in monocrystalline silicon (25-250 mg) 1016 At×cm−3. The method can also be employed to determine the presence of Al in the residues by distillation of a small quantity (5-10g) of many solvents or reagent solutions. Springer-Verlag, 1992 Fresenius' Journal of Analytical Chemistry Springer-Verlag 344/7-8(1992-07-01), 322-325 0937-0633 344:7-8<322 1992 344 216 https://doi.org/10.1007/BF00321841 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00321841 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Zini Q. C.N.R. Istituto LAMEL — Sezione di Chimica, Via dell'Idraulico 17/2°, I-40138, Bologna, Italy aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 344/7-8(1992-07-01), 322-325 0937-0633 344:7-8<322 1992 344 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer