A simple and reliable method has been developed for separation and preconcentration of trace amounts of copper ions in cereals food for subsequent measurement by flame atomic absorption spectrometry （FAAS）. The Cu^2...A simple and reliable method has been developed for separation and preconcentration of trace amounts of copper ions in cereals food for subsequent measurement by flame atomic absorption spectrometry （FAAS）. The Cu^2＋ ions are adsorbed selectively and quantitatively during the passage. The retained copper ions were desorbed from the potassium tetratitanate whisker with 10.0mL of 2mol/L sulphuric acid solutions as eluent and were determined by FAAS. The linear range was 0.05μg/mL-0.20μg/mL in the original solution with a correlation coefficient of 0.9998. The detection limit of the proposed method is 2. lng/mL in the original solution （3σ, n=9）. Determination of copper in standard ions showed that the proposed method has good accuracy （recovery was more than 95%）. The method was successfully applied for recovery and determination of copper in cereals food samples展开更多
A new kind of inorganic composite adsorbent based on chitin whiskers（CHW） and potassium tetratitanate whiskers（PTW） was synthesized via the thermal deposition to remove Cu2＋ and Pb2＋ from wastewater. CHW could b...A new kind of inorganic composite adsorbent based on chitin whiskers（CHW） and potassium tetratitanate whiskers（PTW） was synthesized via the thermal deposition to remove Cu2＋ and Pb2＋ from wastewater. CHW could be successfully coated on the surface of PTW when thermal treated 8 times. The adsorption process was better fitted with the Langmuir and Freundlich models. The adsorption process was more conformed to the Pseudo-second-order model. The results from XPS（X-ray photoelectron spectrum） further show that the adsorption mechanism between CHW-PTW and Cu2＋, Pb2＋ are both ion exchange and chemical adsorption. Thermodynamic parameters suggest that the adsorption processes are nonspontaneous. The adsorption of Cu2＋ and Pb2＋ is endothermic and exothermic, respectively.展开更多
基金Imburse Fund of Science and Technology Office (05C26213100474)
文摘A simple and reliable method has been developed for separation and preconcentration of trace amounts of copper ions in cereals food for subsequent measurement by flame atomic absorption spectrometry （FAAS）. The Cu^2＋ ions are adsorbed selectively and quantitatively during the passage. The retained copper ions were desorbed from the potassium tetratitanate whisker with 10.0mL of 2mol/L sulphuric acid solutions as eluent and were determined by FAAS. The linear range was 0.05μg/mL-0.20μg/mL in the original solution with a correlation coefficient of 0.9998. The detection limit of the proposed method is 2. lng/mL in the original solution （3σ, n=9）. Determination of copper in standard ions showed that the proposed method has good accuracy （recovery was more than 95%）. The method was successfully applied for recovery and determination of copper in cereals food samples
基金Supported by the National Natural Science Foundation of China（No.51308314）.
文摘A new kind of inorganic composite adsorbent based on chitin whiskers（CHW） and potassium tetratitanate whiskers（PTW） was synthesized via the thermal deposition to remove Cu2＋ and Pb2＋ from wastewater. CHW could be successfully coated on the surface of PTW when thermal treated 8 times. The adsorption process was better fitted with the Langmuir and Freundlich models. The adsorption process was more conformed to the Pseudo-second-order model. The results from XPS（X-ray photoelectron spectrum） further show that the adsorption mechanism between CHW-PTW and Cu2＋, Pb2＋ are both ion exchange and chemical adsorption. Thermodynamic parameters suggest that the adsorption processes are nonspontaneous. The adsorption of Cu2＋ and Pb2＋ is endothermic and exothermic, respectively.
