On the basis of that the catalytic decomposition of the title reagent with manganese in sodium tetraborate sodium carborate anhydrous buffer solution,and hydrogen peroxide can accelerate the reaction,a new catalytic s...On the basis of that the catalytic decomposition of the title reagent with manganese in sodium tetraborate sodium carborate anhydrous buffer solution,and hydrogen peroxide can accelerate the reaction,a new catalytic spectrophotometry determination is described.The effect of various experimental factors was studied and the optimal conditions for the determination of Mn(Ⅱ) were found.A better linear relation ship was obtained over the range of 0-0.25 and 0.3-2.0μg/25ml, and the detection limit for Mn(Ⅱ) is 1ng/ml. The method has been used to determine trace Mn(Ⅱ) in waste water,hair and tea satisfactorily.The mechanism of reaction has been studied kinetically.展开更多
The technique conditions of synthesis of hydroxyapatite(HAP) powder were studied by Sol Gel and chemical coprecipitation processes.The FTIR was applied to determine the chemical composition of the prepared product.The...The technique conditions of synthesis of hydroxyapatite(HAP) powder were studied by Sol Gel and chemical coprecipitation processes.The FTIR was applied to determine the chemical composition of the prepared product.The Ca/P ratio was determined also and compared with stoichimetric ratio of hydroxyapatite.The cross experiment result indicated that the optimum technique condition to gain high purity HAP powder involves Ca/P 1.67 ,pH 8.0,temperature 950℃,reaction time 3.5h when (C 4H 9O) 3PO and Ca(NO 3) 2 were used as starting materials;Ca/P 1.67 ,temperature 37.5℃,pH 9.0 and Ca/P 1.50,temperature 80℃,pH 11.0 when H 3PO 4 and Ca(OH) 2 were used as starting materials;and Ca/P 1.50,temperature 37.5℃,pH 9.0,Ca/P 1.67,temperature 50℃,pH 9.0 and Ca/P 1.67,temperature 70℃,pH 10.0 when (NH 4) 2HPO 4 and Ca(NO 3) 2 were used as starting materials.展开更多
The quantitative analycal method of composition including 2MgCO 3·Mg(OH) 2·MgCl 2·6H 2O,5Mg(OH) 2·MgCl 2·8H 2O,3Mg(OH) 2·MgCl 2·8H 2O,4MgCO 3·Mg(OH) 2·4H 2O,MgCO 3,of Magne...The quantitative analycal method of composition including 2MgCO 3·Mg(OH) 2·MgCl 2·6H 2O,5Mg(OH) 2·MgCl 2·8H 2O,3Mg(OH) 2·MgCl 2·8H 2O,4MgCO 3·Mg(OH) 2·4H 2O,MgCO 3,of Magnesium Oxychloride Cement was established by X ray diffraction interior standard method.The interior standard substance is α ZnO.The absolute error is below 5%.The composition of different Magnesium Oxychloride Cement were analysed successfully by the method.展开更多
文摘On the basis of that the catalytic decomposition of the title reagent with manganese in sodium tetraborate sodium carborate anhydrous buffer solution,and hydrogen peroxide can accelerate the reaction,a new catalytic spectrophotometry determination is described.The effect of various experimental factors was studied and the optimal conditions for the determination of Mn(Ⅱ) were found.A better linear relation ship was obtained over the range of 0-0.25 and 0.3-2.0μg/25ml, and the detection limit for Mn(Ⅱ) is 1ng/ml. The method has been used to determine trace Mn(Ⅱ) in waste water,hair and tea satisfactorily.The mechanism of reaction has been studied kinetically.
文摘The technique conditions of synthesis of hydroxyapatite(HAP) powder were studied by Sol Gel and chemical coprecipitation processes.The FTIR was applied to determine the chemical composition of the prepared product.The Ca/P ratio was determined also and compared with stoichimetric ratio of hydroxyapatite.The cross experiment result indicated that the optimum technique condition to gain high purity HAP powder involves Ca/P 1.67 ,pH 8.0,temperature 950℃,reaction time 3.5h when (C 4H 9O) 3PO and Ca(NO 3) 2 were used as starting materials;Ca/P 1.67 ,temperature 37.5℃,pH 9.0 and Ca/P 1.50,temperature 80℃,pH 11.0 when H 3PO 4 and Ca(OH) 2 were used as starting materials;and Ca/P 1.50,temperature 37.5℃,pH 9.0,Ca/P 1.67,temperature 50℃,pH 9.0 and Ca/P 1.67,temperature 70℃,pH 10.0 when (NH 4) 2HPO 4 and Ca(NO 3) 2 were used as starting materials.
文摘The quantitative analycal method of composition including 2MgCO 3·Mg(OH) 2·MgCl 2·6H 2O,5Mg(OH) 2·MgCl 2·8H 2O,3Mg(OH) 2·MgCl 2·8H 2O,4MgCO 3·Mg(OH) 2·4H 2O,MgCO 3,of Magnesium Oxychloride Cement was established by X ray diffraction interior standard method.The interior standard substance is α ZnO.The absolute error is below 5%.The composition of different Magnesium Oxychloride Cement were analysed successfully by the method.
