In an acetic acid–sodium acetate buffer solution of pH 3.6–6.8, a compound complex was formed between sodium hyaluronate (abbreviated as SH) and some basic bisphenylnaphthylmethane dyes, leading to a great enhanceme...In an acetic acid–sodium acetate buffer solution of pH 3.6–6.8, a compound complex was formed between sodium hyaluronate (abbreviated as SH) and some basic bisphenylnaphthylmethane dyes, leading to a great enhancement of the intensity of resonance Rayleigh scattering (RRS) and giving a new RRS spectrum, with its maximum scattering peak near 280 nm. It was also found that the intensity of RRS was directly proportional to the concentration of SH near the range between 0 and 3.0 mg/L. Based on these facts, a sensitive method for the determination of SH has been established. The method had good selectivity, and has been used for the determination of total amounts of SH in samples with satisfactory results. For the NB–SH system, the detection limit of SH was down to 13.7 ng/mL.展开更多
In this work, a sensitive, rapid and simple method for the determination of trace amounts of potassium ferrocyanide in salinized foods and table salt using EV as a RRS probe is established. The detection limit （3σ）...In this work, a sensitive, rapid and simple method for the determination of trace amounts of potassium ferrocyanide in salinized foods and table salt using EV as a RRS probe is established. The detection limit （3σ） of the EV system is 7.8 ng/mL. This new method is more suitable for the determination of the trace amounts of potassium ferrocyanide in colour salinized foods and it can not be disturbed by the color of salinized foods.展开更多
In pH 4.5-7.0 Britton-Robinson buffer solution,furosemide(FUR)reacted with Pd(II)to form a 1:1 anionic chelate.This chelate could further react with such basic triphenylmethane dyes(BTPMD)as ethyl violet(EV),crystal v...In pH 4.5-7.0 Britton-Robinson buffer solution,furosemide(FUR)reacted with Pd(II)to form a 1:1 anionic chelate.This chelate could further react with such basic triphenylmethane dyes(BTPMD)as ethyl violet(EV),crystal violet(CV),methyl violet(MV),methyl green(MeG)and brilliant green(BG)to form 1:1 ion-association complexes.This not only resulted in the change of absorption spectra,but also led to the significant enhancement of resonance Rayleigh scattering(RRS),second-order scattering(SOS)and frequency doubling scattering(FDS).The maximum RRS wavelengths were located at 324 nm for the EV,CV and MV system,and 340 nm for the BG and MeG system.The maximum SOS wavelengths were located at 550 nm for the EV,CV,BG and MeG system,and 530 nm for the MV system.The maximum scattering peaks of all the systems were at 392 nm for FDS.The enhanced RRS,SOS and FDS intensities were directly proportional to the concentration of FUR.The detection limits for the different dye systems were 0.3-4.9 ng mL-1 for the RRS method,3.2-33.1 ng mL-1 for the SOS method and 9.0-85.7 ng mL-1 for the FDS method.These methods could be used for the determination of trace amounts of FUR.The effects of the formation of ternary ion-association complexes on the spectral characteristics and intensities of absorption,RRS,SOS and FDS have been investigated.The optimum conditions of these reactions,the influencing factors and the analytical properties have been tested.The influences of coexisting substances were tested by RRS method and the results showed that this method exhibited a high sensitivity.Based on the aforementioned research,the highly sensitive,simple and rapid methods for the determination of trace amounts of FUR by resonance light scattering technique have been established,which could be applied to the determination of FUR in tablet,injection,human serum and urine samples.The composition and structure of the ternary ion-association complex and the reaction mechanism were discussed.展开更多
In the present work,novel dual-functionalized hollow polymer particles （DF-HPP） with high density of carboxylate and amino dual functional groups have been specially designed and fabricated to serve as high-performa...In the present work,novel dual-functionalized hollow polymer particles （DF-HPP） with high density of carboxylate and amino dual functional groups have been specially designed and fabricated to serve as high-performance adsorbent for selective removal of basic dye （methylene blue,b-MB,as a model dye）.Due to both the high surface area and the extremely high density of carboxylate and amino groups,the DF-HPPs exhibited excellent adsorption property for methylene blue （b-MB）,including high adsorption capacity,fast adsorption/desorption rates,unique pH-sensitivity and easy recovery.The equilibrium adsorption data of b-MB on the DF-HPPs were evaluated using Freundlich and Langmuir isotherm models,and the equilibrium isotherm was better fit with Langmuir model with a maximum adsorption capacity of 538.8 mg/g at pH 12.More interestingly,the DF-HPPs showed a significant pH-dependent equilibrium adsorption capacity,which decreased dramatically from 516.1 mg/g to 24 mg/g as the solution pH decreased from 12 to 3.The dye-adsorbed DF-HPPs can be facilely and rapidly regenerated under mild condition （under weak acidic solution,pH 3,in 30 min） to recover both b-MB and the DF-HPPs,and the regenerated DF-HPPs can be reused for dye removal with high efficiency,indicating the exceptional recyclability of the DF-HPPs.展开更多
In a pH 4.2-6.0 HAc-NaAc buffer medium,the resonance Rayleigh scattering intensities of separate basic triphenylmethane dyes,such as methyl violet(MV),ethyl violet(EV),crystal violet(CV),methyl green(MeG),iodine green...In a pH 4.2-6.0 HAc-NaAc buffer medium,the resonance Rayleigh scattering intensities of separate basic triphenylmethane dyes,such as methyl violet(MV),ethyl violet(EV),crystal violet(CV),methyl green(MeG),iodine green(IG),malachite green(MG),light green(LG),and tungstate ion solution,are very weak,but when these cationic dyes react with the tungstate ion(WO 42-)to form ion-association complexes,their RRS are enhanced sharply and new RRS spectra appear.The reaction products of methyl violet,ethyl violet,and crystal violet with WO 42-have similar spectral characteristics and there are two strong RRS peaks at 330 nm and 560 nm.The reaction products of methyl green,iodine green,malachite green,light green with WO 42-have similar spectral characteristics and there are three RRS peaks at about 335 nm,450 nm and 580 nm.The sensitivities of seven kinds of reaction products show a sequence of malachite green>light green>crystal violet>ethyl violet>methyl green>iodine green>methyl violet.The linear ranges and detection limits of the above seven systems are 0.06-2.78μg mL-1 and 18.1 ng mL-1(MG),0.08-4.83μg mL-1 and 22.6 ng mL-1(BG),0.10-4.90μg mL-1 and 31.4 ng mL-1(CV),0.14-2.95μg mL-1 and 40.5 ng mL-1(EV),0.17-3.70μg mL-1 and 50.2 ng mL-1(MeG),0.22-5.70μg mL-1 and 67.1 ng mL-1(IG),and 0.25-7.30μg mL-1 and 76.3 ng mL-1(MV).A sensitive,simple and fast RRS method for the determination of basic triphenylmethane dyes using the tungstate ion as the probe has been developed.The method is applicable to the determination of malachite green residues in fish flesh.展开更多
The ion transfer of the basic dye rhodamine B at the interface between water and nitro- benzene,water and 1,2-dichloroethane,as well as water and nitrobenzene-chlorobenzene mixtures has been studied by cyclic voltamme...The ion transfer of the basic dye rhodamine B at the interface between water and nitro- benzene,water and 1,2-dichloroethane,as well as water and nitrobenzene-chlorobenzene mixtures has been studied by cyclic voltammetry and chronopotentiometry with linear current scanning.A transfer mechanism of rhodamine B is proposed in terms of its electrochemical behavior,dissociation and distribution equilibria,and is ascribed as diffusion-controlled reversible process of rhodamine B.The ex- perimental data obtained for the relationship between interfacial half-wave potential ° and pH are in agreement with the theoretical equation based on the mechanism,and the standard interracial potential differences °and standard Gibbs energies G°are calculated by extrapolation.The effect of the nature of solvent on the transfer behavior and the stability of the interface have been dis- cussed.展开更多
文摘In an acetic acid–sodium acetate buffer solution of pH 3.6–6.8, a compound complex was formed between sodium hyaluronate (abbreviated as SH) and some basic bisphenylnaphthylmethane dyes, leading to a great enhancement of the intensity of resonance Rayleigh scattering (RRS) and giving a new RRS spectrum, with its maximum scattering peak near 280 nm. It was also found that the intensity of RRS was directly proportional to the concentration of SH near the range between 0 and 3.0 mg/L. Based on these facts, a sensitive method for the determination of SH has been established. The method had good selectivity, and has been used for the determination of total amounts of SH in samples with satisfactory results. For the NB–SH system, the detection limit of SH was down to 13.7 ng/mL.
基金supported by the National Natural Science Foundation of China(No.20475045)Scientific Research Foundation of Bureau of Quality and Technical Supervision of China(No.2005 J0095).
文摘In this work, a sensitive, rapid and simple method for the determination of trace amounts of potassium ferrocyanide in salinized foods and table salt using EV as a RRS probe is established. The detection limit （3σ） of the EV system is 7.8 ng/mL. This new method is more suitable for the determination of the trace amounts of potassium ferrocyanide in colour salinized foods and it can not be disturbed by the color of salinized foods.
文摘In pH 4.5-7.0 Britton-Robinson buffer solution,furosemide(FUR)reacted with Pd(II)to form a 1:1 anionic chelate.This chelate could further react with such basic triphenylmethane dyes(BTPMD)as ethyl violet(EV),crystal violet(CV),methyl violet(MV),methyl green(MeG)and brilliant green(BG)to form 1:1 ion-association complexes.This not only resulted in the change of absorption spectra,but also led to the significant enhancement of resonance Rayleigh scattering(RRS),second-order scattering(SOS)and frequency doubling scattering(FDS).The maximum RRS wavelengths were located at 324 nm for the EV,CV and MV system,and 340 nm for the BG and MeG system.The maximum SOS wavelengths were located at 550 nm for the EV,CV,BG and MeG system,and 530 nm for the MV system.The maximum scattering peaks of all the systems were at 392 nm for FDS.The enhanced RRS,SOS and FDS intensities were directly proportional to the concentration of FUR.The detection limits for the different dye systems were 0.3-4.9 ng mL-1 for the RRS method,3.2-33.1 ng mL-1 for the SOS method and 9.0-85.7 ng mL-1 for the FDS method.These methods could be used for the determination of trace amounts of FUR.The effects of the formation of ternary ion-association complexes on the spectral characteristics and intensities of absorption,RRS,SOS and FDS have been investigated.The optimum conditions of these reactions,the influencing factors and the analytical properties have been tested.The influences of coexisting substances were tested by RRS method and the results showed that this method exhibited a high sensitivity.Based on the aforementioned research,the highly sensitive,simple and rapid methods for the determination of trace amounts of FUR by resonance light scattering technique have been established,which could be applied to the determination of FUR in tablet,injection,human serum and urine samples.The composition and structure of the ternary ion-association complex and the reaction mechanism were discussed.
文摘In the present work,novel dual-functionalized hollow polymer particles （DF-HPP） with high density of carboxylate and amino dual functional groups have been specially designed and fabricated to serve as high-performance adsorbent for selective removal of basic dye （methylene blue,b-MB,as a model dye）.Due to both the high surface area and the extremely high density of carboxylate and amino groups,the DF-HPPs exhibited excellent adsorption property for methylene blue （b-MB）,including high adsorption capacity,fast adsorption/desorption rates,unique pH-sensitivity and easy recovery.The equilibrium adsorption data of b-MB on the DF-HPPs were evaluated using Freundlich and Langmuir isotherm models,and the equilibrium isotherm was better fit with Langmuir model with a maximum adsorption capacity of 538.8 mg/g at pH 12.More interestingly,the DF-HPPs showed a significant pH-dependent equilibrium adsorption capacity,which decreased dramatically from 516.1 mg/g to 24 mg/g as the solution pH decreased from 12 to 3.The dye-adsorbed DF-HPPs can be facilely and rapidly regenerated under mild condition （under weak acidic solution,pH 3,in 30 min） to recover both b-MB and the DF-HPPs,and the regenerated DF-HPPs can be reused for dye removal with high efficiency,indicating the exceptional recyclability of the DF-HPPs.
基金supported by the National Natural Science Foundation of China(Grant No.20875078)Chongqing Natural Science Foundation(CSTC,2007BB1359)Key Laboratory on Luminescence and Real-Time Analysis,Ministry of Education(Southwest University)(CSTC,2006CA8006)
文摘In a pH 4.2-6.0 HAc-NaAc buffer medium,the resonance Rayleigh scattering intensities of separate basic triphenylmethane dyes,such as methyl violet(MV),ethyl violet(EV),crystal violet(CV),methyl green(MeG),iodine green(IG),malachite green(MG),light green(LG),and tungstate ion solution,are very weak,but when these cationic dyes react with the tungstate ion(WO 42-)to form ion-association complexes,their RRS are enhanced sharply and new RRS spectra appear.The reaction products of methyl violet,ethyl violet,and crystal violet with WO 42-have similar spectral characteristics and there are two strong RRS peaks at 330 nm and 560 nm.The reaction products of methyl green,iodine green,malachite green,light green with WO 42-have similar spectral characteristics and there are three RRS peaks at about 335 nm,450 nm and 580 nm.The sensitivities of seven kinds of reaction products show a sequence of malachite green>light green>crystal violet>ethyl violet>methyl green>iodine green>methyl violet.The linear ranges and detection limits of the above seven systems are 0.06-2.78μg mL-1 and 18.1 ng mL-1(MG),0.08-4.83μg mL-1 and 22.6 ng mL-1(BG),0.10-4.90μg mL-1 and 31.4 ng mL-1(CV),0.14-2.95μg mL-1 and 40.5 ng mL-1(EV),0.17-3.70μg mL-1 and 50.2 ng mL-1(MeG),0.22-5.70μg mL-1 and 67.1 ng mL-1(IG),and 0.25-7.30μg mL-1 and 76.3 ng mL-1(MV).A sensitive,simple and fast RRS method for the determination of basic triphenylmethane dyes using the tungstate ion as the probe has been developed.The method is applicable to the determination of malachite green residues in fish flesh.
基金The support of the National Natural Science Foundation of China is gratefully acknowledged.
文摘The ion transfer of the basic dye rhodamine B at the interface between water and nitro- benzene,water and 1,2-dichloroethane,as well as water and nitrobenzene-chlorobenzene mixtures has been studied by cyclic voltammetry and chronopotentiometry with linear current scanning.A transfer mechanism of rhodamine B is proposed in terms of its electrochemical behavior,dissociation and distribution equilibria,and is ascribed as diffusion-controlled reversible process of rhodamine B.The ex- perimental data obtained for the relationship between interfacial half-wave potential ° and pH are in agreement with the theoretical equation based on the mechanism,and the standard interracial potential differences °and standard Gibbs energies G°are calculated by extrapolation.The effect of the nature of solvent on the transfer behavior and the stability of the interface have been dis- cussed.
