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The silex glass sample was decomposed by HF.The content of B in silex glass was determined by graphite furnace at. absorption spectrometry (GFAAS), which was completed by adding chem. modifier Ba(OH)₂, multiple injecting condensed solution of sample, and incinerating at low temperature for long time HNO₃ solutionThe method could improve the sensitivity and accuracy of determination B in silex glass by GFAAS.

Qinghua Daxue Xuebao, Ziran Kexueban

Effect of feeding mode and flow distribution on SiO_2 synthesis from D4

Author: Zhang Han ; Zheng Lili ; Ouyang Baohua ; Zhang Guojun ; Wu Xuemin ; Huang Zeyu

Burner design and flow rate control strongly impact combustion stability, SiO_2 generation, soot quality, and key flue gas components.This paper presents a numerical study of SiO_2 soot synthesis by the CVD method with octamethylcyclotetra-siloxane(also called 'OMCTS' or 'D4') as the precursor.The study investigates the effects of various feeding modes and D4 and oxygen mass flow rates on the SiO_2 generation efficiency and the distribution of key components on the surface.The SiO_2 generation rate and deposition uniformity can be significantly improved by using the multi-point feeding mode which increases the SiO_2 generation rate and reduces the OH concentration even with similar D4 inlet velocities.Proper control of the oxygen flow rate relative to the D4 mass flow rate improves the SiO_2 generation rate, but also increases the OH concentrationThe multi-point feeding mode with the same D4 mass flow rate can reduce the D4 inlet velocity with then reduces the deposition efficiency some.Multi-point feeding with the proper increased D4 flow rate and flame temperature control improves the SiO_2 generation rate and deposition efficiency.

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