The Alkoxylsilanes were synthesized by means of solvent method to methanolyze methyl-substituted chlorosilanes .The methanolysis was investigated under different reaction conditions:temperature,various solvents and dr...The Alkoxylsilanes were synthesized by means of solvent method to methanolyze methyl-substituted chlorosilanes .The methanolysis was investigated under different reaction conditions:temperature,various solvents and dropping manner.Thas provide available experimental data for synthesizing these kinds of organo-silicone monomers.展开更多
A new catalytic kinetic method for determining trace selenium(Ⅳ) was described.Se(Ⅳ) can catalyze the discolouring of 2 (5 Bromo 2 Pyridylazo) 5 diethylaminophenol(5 Br PADAP) by potassium chlorate in hydrochloric a...A new catalytic kinetic method for determining trace selenium(Ⅳ) was described.Se(Ⅳ) can catalyze the discolouring of 2 (5 Bromo 2 Pyridylazo) 5 diethylaminophenol(5 Br PADAP) by potassium chlorate in hydrochloric acid medium.The detection limit for Se(Ⅳ) is 5.7×10 -5 μg/ml.The linear range of determination is 0～ 0.4μg/25ml Se(Ⅳ).Satisfactory results may be obtained by direct determination of trace Se(Ⅳ) in human hair.展开更多
文摘The Alkoxylsilanes were synthesized by means of solvent method to methanolyze methyl-substituted chlorosilanes .The methanolysis was investigated under different reaction conditions:temperature,various solvents and dropping manner.Thas provide available experimental data for synthesizing these kinds of organo-silicone monomers.
文摘A new catalytic kinetic method for determining trace selenium(Ⅳ) was described.Se(Ⅳ) can catalyze the discolouring of 2 (5 Bromo 2 Pyridylazo) 5 diethylaminophenol(5 Br PADAP) by potassium chlorate in hydrochloric acid medium.The detection limit for Se(Ⅳ) is 5.7×10 -5 μg/ml.The linear range of determination is 0～ 0.4μg/25ml Se(Ⅳ).Satisfactory results may be obtained by direct determination of trace Se(Ⅳ) in human hair.
