An optimized selective sequential extraction(SSE)procedure was developed to assess the arsenic(As)partitioning in copper slag.The potential As species in copper slag are partitioned into the readily soluble As,dissolv...An optimized selective sequential extraction(SSE)procedure was developed to assess the arsenic(As)partitioning in copper slag.The potential As species in copper slag are partitioned into the readily soluble As,dissolvable arsenates,sparingly soluble arsenates,As residing in sulfides,arsenopyrite and metal As,as well as As incorporated into glassy silicates.The inductively coupled plasma atomic emission spectrometry(ICP-AES),scanning electronic microscopy(SEM),transmission electron microscope(TEM),X-ray diffractometry(XRD)and Fourier transform infrared spectroscopy(FTIR)were used to characterize the leachates and residues produced from the operation scheme.The selectivity and recovery of extractants were evaluated through single-phase extraction procedures.Partitioning data of As in slag samples show good agreement with the reported works and the total As recovery of each operation is over 90%.This suggests that the optimized SEE scheme can be reliably employed for As partitioning in As-bearing byproducts from copper smelting.展开更多
Copper electrolyte was purified by copper arsenite that was prepared with As2O3.And electrolysis experiments of purified electrolyte were carried out at 235 and 305 A/m2,respectively.The results show that the yield of...Copper electrolyte was purified by copper arsenite that was prepared with As2O3.And electrolysis experiments of purified electrolyte were carried out at 235 and 305 A/m2,respectively.The results show that the yield of copper arsenite is up to 98.64% when the molar ratio of Cu to As is 1.5 in the preparation of copper arsenite.The removal rates of Sb and Bi reach 74.11% and 65.60% respectively after copper arsenite is added in electrolyte.The concentrations of As,Sb and Bi in electrolyte nearly remain constant during electrolysis of 13 d.The appearances of cathode copper obtained at 235 and 305 A/m2 are slippery and even,and the qualification rate is 100% according to the Chinese standard of high-pure cathode copper(GB/T467-97).展开更多
Cherry regeneration via somatic embryogenesis is a powerful tool to breeding. In this way, the embryogenic capacity of Prunus incisa specie has been tested from leaves under different interactions of picloram concentr...Cherry regeneration via somatic embryogenesis is a powerful tool to breeding. In this way, the embryogenic capacity of Prunus incisa specie has been tested from leaves under different interactions of picloram concentrations and darkness exposures. Induction culture was achieved on MS medium supplemented with picloram concentrations at 0.5, 1 and 1.5 mg.L1 and submitted to 10, 20, 30 and 40 days of darkness. The best rate of embryogenic leaves was obtained with the interaction of 30 days darkness exposure＊ 1 mg.L^-1 picloram. According to their age, leaves were differently reacted to somatic embryogenesis; indeed, the 2nd expanded leaf from the apex was the most embryogenic one. Concerning the effect of additional auxin to picloram （1 mg·L^-1）, IAA at 0.1 mg·L^-1 and IBA at 0.1 mg·L^-1 gave significantly higher induction rates than all other concentrations, but regenerating somatic embryos showed some teratological abnormalities probably due to seconda;y embryogenesis. At the opposite, NAA at 0.5 mg·L^-1 didn＇t improve embryogenic rate but affected positively embryo development. Furthermore, embryogenesis preferentially took place on the basal part of leaf. Satisfactory rates of somatic embryogenesis are obtained but further improvement remains possible.展开更多
Solanum incanum, a shrubby herb, is widely distributed and used as analgesic, antitoxic, and antispasmodic in folk medicine. In the present study, the protective effects of aqueous extract of S. incanum against acetam...Solanum incanum, a shrubby herb, is widely distributed and used as analgesic, antitoxic, and antispasmodic in folk medicine. In the present study, the protective effects of aqueous extract of S. incanum against acetaminophen induced acute liver damage were evaluated in guinea pigs. Animals were orally administered with S. incanum extract （50 and 100 mg/ kg bw） and silymarin （ 100 mg / kg bw） respectively for 6 days followed by acetaminophen administration （2 g / kg bw） at the 7th day. The results showed that the treatment with S. incanum extract significantly lowered the acetaminophen-induced serum levels of hepatic marker enzymes （AST, ALT, and ALP）, Liver histopathology also showed that S. incanum extract reduced the incidence of liver lesions including the swelling of hepatic cells, lymphocytes infiltration, nucleus condensation, and hepatic necrosis induced by acetaminophen treatment in guinea pigs. The S. incanum extract at a dose of 100 mg / kg bw was more effective in suppressing the oxidative damage than the extract at a dose of 50 mg / kg bw. Therefore, the results of this study suggest that S. incanum extract could protect liver against the acetaminophen-induced oxidative damage.展开更多
基金Projects(51874257,51374185,51801183)supported by the National Natural Science Foundation of China。
文摘An optimized selective sequential extraction(SSE)procedure was developed to assess the arsenic(As)partitioning in copper slag.The potential As species in copper slag are partitioned into the readily soluble As,dissolvable arsenates,sparingly soluble arsenates,As residing in sulfides,arsenopyrite and metal As,as well as As incorporated into glassy silicates.The inductively coupled plasma atomic emission spectrometry(ICP-AES),scanning electronic microscopy(SEM),transmission electron microscope(TEM),X-ray diffractometry(XRD)and Fourier transform infrared spectroscopy(FTIR)were used to characterize the leachates and residues produced from the operation scheme.The selectivity and recovery of extractants were evaluated through single-phase extraction procedures.Partitioning data of As in slag samples show good agreement with the reported works and the total As recovery of each operation is over 90%.This suggests that the optimized SEE scheme can be reliably employed for As partitioning in As-bearing byproducts from copper smelting.
基金Project(200501045) supported by Innovation Fund of Hubei Daye Nonferrous Metal Limited Company of China
文摘Copper electrolyte was purified by copper arsenite that was prepared with As2O3.And electrolysis experiments of purified electrolyte were carried out at 235 and 305 A/m2,respectively.The results show that the yield of copper arsenite is up to 98.64% when the molar ratio of Cu to As is 1.5 in the preparation of copper arsenite.The removal rates of Sb and Bi reach 74.11% and 65.60% respectively after copper arsenite is added in electrolyte.The concentrations of As,Sb and Bi in electrolyte nearly remain constant during electrolysis of 13 d.The appearances of cathode copper obtained at 235 and 305 A/m2 are slippery and even,and the qualification rate is 100% according to the Chinese standard of high-pure cathode copper(GB/T467-97).
文摘Cherry regeneration via somatic embryogenesis is a powerful tool to breeding. In this way, the embryogenic capacity of Prunus incisa specie has been tested from leaves under different interactions of picloram concentrations and darkness exposures. Induction culture was achieved on MS medium supplemented with picloram concentrations at 0.5, 1 and 1.5 mg.L1 and submitted to 10, 20, 30 and 40 days of darkness. The best rate of embryogenic leaves was obtained with the interaction of 30 days darkness exposure＊ 1 mg.L^-1 picloram. According to their age, leaves were differently reacted to somatic embryogenesis; indeed, the 2nd expanded leaf from the apex was the most embryogenic one. Concerning the effect of additional auxin to picloram （1 mg·L^-1）, IAA at 0.1 mg·L^-1 and IBA at 0.1 mg·L^-1 gave significantly higher induction rates than all other concentrations, but regenerating somatic embryos showed some teratological abnormalities probably due to seconda;y embryogenesis. At the opposite, NAA at 0.5 mg·L^-1 didn＇t improve embryogenic rate but affected positively embryo development. Furthermore, embryogenesis preferentially took place on the basal part of leaf. Satisfactory rates of somatic embryogenesis are obtained but further improvement remains possible.
文摘Solanum incanum, a shrubby herb, is widely distributed and used as analgesic, antitoxic, and antispasmodic in folk medicine. In the present study, the protective effects of aqueous extract of S. incanum against acetaminophen induced acute liver damage were evaluated in guinea pigs. Animals were orally administered with S. incanum extract （50 and 100 mg/ kg bw） and silymarin （ 100 mg / kg bw） respectively for 6 days followed by acetaminophen administration （2 g / kg bw） at the 7th day. The results showed that the treatment with S. incanum extract significantly lowered the acetaminophen-induced serum levels of hepatic marker enzymes （AST, ALT, and ALP）, Liver histopathology also showed that S. incanum extract reduced the incidence of liver lesions including the swelling of hepatic cells, lymphocytes infiltration, nucleus condensation, and hepatic necrosis induced by acetaminophen treatment in guinea pigs. The S. incanum extract at a dose of 100 mg / kg bw was more effective in suppressing the oxidative damage than the extract at a dose of 50 mg / kg bw. Therefore, the results of this study suggest that S. incanum extract could protect liver against the acetaminophen-induced oxidative damage.
