We report on the use of titanium dioxide nanoparticles (NPs) coated with poly-thiophene for the preconcentration of copper and silverions. The NPs were prepared by first modifying the surface of TiO2 NPs with vinyl gr...We report on the use of titanium dioxide nanoparticles (NPs) coated with poly-thiophene for the preconcentration of copper and silverions. The NPs were prepared by first modifying the surface of TiO2 NPs with vinyl groups and then copolymerizing them with vinyl thiophen. The resulting TiO2-polythiophene core-shell NPs were characterized by thermogravimetry, differential thermal analysis, scanning electron microscopy, Fourier transform infrared spectrometry and X-ray diffraction. The experimental conditions such as pH value, adsorption and desorption time, type, concentration and volume of the eluent, break through volume, and effect of potentially interfering ions were optimized. The ions were then desorbed with hydrochloric acid and determined by FAAS. The limits of detection are 0.4 and 1.2 μg·L_1 for Cu(II) and Ag(I), respectively, and recoveries and precisions are >98.0%展开更多
Tricalcium phosphate Anhydrous Powder typically contains less than 10 ppm (mg/Kg) (w/w) manganese. This level can be determined utilizing Flame Atomic Absorption Spectrometer (AAS) and standard based on known standard...Tricalcium phosphate Anhydrous Powder typically contains less than 10 ppm (mg/Kg) (w/w) manganese. This level can be determined utilizing Flame Atomic Absorption Spectrometer (AAS) and standard based on known standards. A number of analytical methods are presently used for the analysis of metals in the biochemical. The instrumental techniques available are Inductively Coupled Plasma (ICP/MS), X-Ray Fluorescence, UV-VIS Spectrophotometry, and Atomic Absorption Spectrometry. Flame AA has gained widespread acceptance as an analytical technique and is used for many applications. In this study, we have determined the amount of manganese metal present in Tricalcium Phosphate (TCP) using Flame Atomic Absorption Spectrophotometer. The method has high precision and accuracy. The percent recovery was found to be 99.8% for spiked sample. The results meet the requirement.展开更多
文章对比了两种分光光度法测定水中铁含量的检测结果,并对二氮杂菲分光光度法进行了优化改进。改进措施包括以下三方面,第一,将小火煮沸步骤改为100℃恒温水浴10 min,确保标准曲线和检测样品所用条件相同;第二,将试剂使用量减半,有利于...文章对比了两种分光光度法测定水中铁含量的检测结果,并对二氮杂菲分光光度法进行了优化改进。改进措施包括以下三方面,第一,将小火煮沸步骤改为100℃恒温水浴10 min,确保标准曲线和检测样品所用条件相同;第二,将试剂使用量减半,有利于降低成本并减少环境污染;第三,将取样量改为40 m L。通过标准曲线、检出限、精密度和加标回收实验测定,发现改进后的方法斜率更大、灵敏度更高,具有良好的精密度和准确度,检测结果真实可靠。两种分光光度法对于水中铁含量的测定均表现出了较高的灵敏度,而改进后的二氮杂菲分光光度法更适用于水中铁含量的测定。展开更多
文摘We report on the use of titanium dioxide nanoparticles (NPs) coated with poly-thiophene for the preconcentration of copper and silverions. The NPs were prepared by first modifying the surface of TiO2 NPs with vinyl groups and then copolymerizing them with vinyl thiophen. The resulting TiO2-polythiophene core-shell NPs were characterized by thermogravimetry, differential thermal analysis, scanning electron microscopy, Fourier transform infrared spectrometry and X-ray diffraction. The experimental conditions such as pH value, adsorption and desorption time, type, concentration and volume of the eluent, break through volume, and effect of potentially interfering ions were optimized. The ions were then desorbed with hydrochloric acid and determined by FAAS. The limits of detection are 0.4 and 1.2 μg·L_1 for Cu(II) and Ag(I), respectively, and recoveries and precisions are >98.0%
文摘Tricalcium phosphate Anhydrous Powder typically contains less than 10 ppm (mg/Kg) (w/w) manganese. This level can be determined utilizing Flame Atomic Absorption Spectrometer (AAS) and standard based on known standards. A number of analytical methods are presently used for the analysis of metals in the biochemical. The instrumental techniques available are Inductively Coupled Plasma (ICP/MS), X-Ray Fluorescence, UV-VIS Spectrophotometry, and Atomic Absorption Spectrometry. Flame AA has gained widespread acceptance as an analytical technique and is used for many applications. In this study, we have determined the amount of manganese metal present in Tricalcium Phosphate (TCP) using Flame Atomic Absorption Spectrophotometer. The method has high precision and accuracy. The percent recovery was found to be 99.8% for spiked sample. The results meet the requirement.
文摘文章对比了两种分光光度法测定水中铁含量的检测结果,并对二氮杂菲分光光度法进行了优化改进。改进措施包括以下三方面,第一,将小火煮沸步骤改为100℃恒温水浴10 min,确保标准曲线和检测样品所用条件相同;第二,将试剂使用量减半,有利于降低成本并减少环境污染;第三,将取样量改为40 m L。通过标准曲线、检出限、精密度和加标回收实验测定,发现改进后的方法斜率更大、灵敏度更高,具有良好的精密度和准确度,检测结果真实可靠。两种分光光度法对于水中铁含量的测定均表现出了较高的灵敏度,而改进后的二氮杂菲分光光度法更适用于水中铁含量的测定。