A novel chemiluminescence system for the determination of catechol in water was first described in this paper.It was based on the chemiluminescence reaction of catechol and hydroxyl radical that was the product of the...A novel chemiluminescence system for the determination of catechol in water was first described in this paper.It was based on the chemiluminescence reaction of catechol and hydroxyl radical that was the product of the reaction of Fe3+and H2O2.Rh6G could enhance the chemiluminescence intensity.The linear range was 10-2000μg/L with a detection limit of 5μg/L（3σ）.The relative standard deviation was 3.1% for 200μg/L of catechol（n=11）.The proposed method was successfully applied to the determination of catechol in water.展开更多
A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ) 2-BBSTA] as neutral carrier is reported, which displays an anti-Hof...A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ) 2-BBSTA] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence. The electrode exhibits Nernstian potential linear range to thiocyanate from 1.0×10 -1 to 1.0×10 -6 mol/L with a detection limit 8.0×10 -7 mol/L and a slope of -52.0 mV/dec in phosphorate buffer solution of pH=5.0 at 25 ℃. The response mechanism is discussed in view of the a.c. impedance technique and the UV spectroscopy technique. The electrode based on binuclear cobalt(Ⅱ) compound was used to determine the thiocyanate content in waste water with satisfactory results.展开更多
A new spectrophotometric method for the determination of trace heparin has been studied. The method was based on the discoloration reaction between heparin and bisphenylnaphthylmethane dyes such as victoria blue 4R(VB...A new spectrophotometric method for the determination of trace heparin has been studied. The method was based on the discoloration reaction between heparin and bisphenylnaphthylmethane dyes such as victoria blue 4R(VB4R), victoria blue B(VBB) and night blue(NB) in weak acid medium. The reduction in absorbance was directly proportional to the concentration of heparin. The linear ranges of heparin were from 0 to 2.4 μg/mL for all systems. The molar absorptivities( ε ) of the three systems were between 2.11×10 6 and 2.66×10 6 L·mol -1 ·cm -1 and the sensitivity of VB4R system was the highest. Taking VB4R system for an example, the effects of some coexisting substances on the determination of heparin have been investigated and the results showed that the method had a good selectivity. The method has been applied to determination of the heparin samples with satisfactory results.展开更多
In a thin HCl medium,RRS intensities of an alone CS or acidic triphenylmethane dye (TPMD) are very week. However,when TPMD reacts with a CS to form an ion-associate,the RRS intensity is enhanced greatly and a new RRS ...In a thin HCl medium,RRS intensities of an alone CS or acidic triphenylmethane dye (TPMD) are very week. However,when TPMD reacts with a CS to form an ion-associate,the RRS intensity is enhanced greatly and a new RRS spectrum appears. The spectral characteristics of the RRS for the ion-associates and the optimum conditions for the reactions are investigated. The intensity of RRS is directly proportional to the mass concentration of CS in the range of 0—3.5 or 0—5.0 μg/mL. The method has a high sensitivity for the determination of CS,their detection limits are between 3.1 and 9.8 ng/mL depending on the different CS. In this case,most metal and non-metal ions do not interfere,so that the method has a good selectivity. Therefore,a sensitive,selective,simple and rapid method for the determination of CS by RRS is developed. [WT5HZ]展开更多
文摘A novel chemiluminescence system for the determination of catechol in water was first described in this paper.It was based on the chemiluminescence reaction of catechol and hydroxyl radical that was the product of the reaction of Fe3+and H2O2.Rh6G could enhance the chemiluminescence intensity.The linear range was 10-2000μg/L with a detection limit of 5μg/L（3σ）.The relative standard deviation was 3.1% for 200μg/L of catechol（n=11）.The proposed method was successfully applied to the determination of catechol in water.
文摘A new highly selective thiocyanate PVC membrane electrode based on bisbebzoin-semitriethylenetetraamine binuclear cobalt(Ⅱ) metallic complex [Co(Ⅱ) 2-BBSTA] as neutral carrier is reported, which displays an anti-Hofmeister selectivity sequence. The electrode exhibits Nernstian potential linear range to thiocyanate from 1.0×10 -1 to 1.0×10 -6 mol/L with a detection limit 8.0×10 -7 mol/L and a slope of -52.0 mV/dec in phosphorate buffer solution of pH=5.0 at 25 ℃. The response mechanism is discussed in view of the a.c. impedance technique and the UV spectroscopy technique. The electrode based on binuclear cobalt(Ⅱ) compound was used to determine the thiocyanate content in waste water with satisfactory results.
文摘A new spectrophotometric method for the determination of trace heparin has been studied. The method was based on the discoloration reaction between heparin and bisphenylnaphthylmethane dyes such as victoria blue 4R(VB4R), victoria blue B(VBB) and night blue(NB) in weak acid medium. The reduction in absorbance was directly proportional to the concentration of heparin. The linear ranges of heparin were from 0 to 2.4 μg/mL for all systems. The molar absorptivities( ε ) of the three systems were between 2.11×10 6 and 2.66×10 6 L·mol -1 ·cm -1 and the sensitivity of VB4R system was the highest. Taking VB4R system for an example, the effects of some coexisting substances on the determination of heparin have been investigated and the results showed that the method had a good selectivity. The method has been applied to determination of the heparin samples with satisfactory results.
文摘In a thin HCl medium,RRS intensities of an alone CS or acidic triphenylmethane dye (TPMD) are very week. However,when TPMD reacts with a CS to form an ion-associate,the RRS intensity is enhanced greatly and a new RRS spectrum appears. The spectral characteristics of the RRS for the ion-associates and the optimum conditions for the reactions are investigated. The intensity of RRS is directly proportional to the mass concentration of CS in the range of 0—3.5 or 0—5.0 μg/mL. The method has a high sensitivity for the determination of CS,their detection limits are between 3.1 and 9.8 ng/mL depending on the different CS. In this case,most metal and non-metal ions do not interfere,so that the method has a good selectivity. Therefore,a sensitive,selective,simple and rapid method for the determination of CS by RRS is developed. [WT5HZ]
