Determination of Selenium(Ⅳ) and Selenium(Ⅵ) in Water Samples With Two-step Extraction by Slotted Graphite Tube Atom-trapping and Flame Atomic Absorption Spectrometry
According to combustion phenomenon, polymer 4 was supposed to be processed with a good flame-retardant property because of its excellent crosslinked structure during pyrolysis or combustion.
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In order to improve wood properties of triploid clones of Populus tomentosa, urea-formaldehyde (UF) resin was compounded with nano-SiO2, coupling agents and flame retardants in different ways to prepare five kinds of modifiers.
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Results show that all of the modifiers reduced water absorption of poplar wood and enhanced flame resistance and hardness.
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Identifying combustion intermediates in premixed MTBE/gasoline/oxygen flame probed via synchrotron radiation
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In this paper, the results to identify combustion intermediates in low-pressure premixed gasoline/oxygen flame with the synchrotron radiation were reported.
Decompose lithium ores with a mixture of HF and H_2SO_2, expel HF by evaporation. Separate Fe and Al. by means of urea, and separate Ca by precipitation with saturated oxalic acid. The interference of potassium may be corrected by calibration curve method. The amounts of Li_2O (apparent) and K_2O in solution may be determined by flame photometry. The actual lithium contents obtained by method of difference have been compared with that of control samples contaning Li_2O<0.11%, the absolute deviation is...
Mixtures of acetaldchyde, crotonaldehyde and acetone in very dilute aqueous solutions (0.5-4%) have been analyzed gas-chromatographically with an average error of about 5% for each constituent, a home-made flame-ionization detector and a polyethylene-glycol-pow-dered-firc-brick column being used.
The kinetics of gas phase oxidation of isobutene was studied in the range of 295—485℃ and 96—387 mm Hg. Under these conditions, no cool flame and negative temperature coefficient phenomenon was observed. The maximum reaction rate which is expressed in terms of the rate of pressure change follows the relationship: