A simple method for the determination of chlorine, phosphorus and sulfur in Fuzi by ion chromatography has been proposed. The sample was ashed at 600℃ in the presence of Na 2CO 3 and extracted with boiling water. Sep...A simple method for the determination of chlorine, phosphorus and sulfur in Fuzi by ion chromatography has been proposed. The sample was ashed at 600℃ in the presence of Na 2CO 3 and extracted with boiling water. Separation of chlorine, phosphorus and sulfur in the form of Cl -, HPO 4 2- and SO 4 2- was carried out on an anion exchange resin column with a solution of 1 0×10 -3 mo1/L Na 2CO 3 4 0×10 -3 mo1/L NaHCO 3 as mobile phase. The linear ranges for the determination of Cl -,HPO 4 2- and SO 4 2- are (0 2～15 0)×10 -6 g/mL, (0 9～25 0)×10 -6 g/mL and (3 0～25 0)×10 -6 g/mL with correlation coefficients of 0 9998, 0 9981 and 0 9979, respectively; The RSDs are 4 2%, 3 9% and 3 2% respectively; The ranges of recovery are 95 0%～105%, 92 0%～107% and 91 0%～100%, respectively.展开更多
A direct spectrophotometric method for the determination of micro copper in aluminum alloy using PAN as chromogenic reagent has been proposed. In the presence of CTMAB,a stable red complex between Cu(Ⅱ) and PAN is fo...A direct spectrophotometric method for the determination of micro copper in aluminum alloy using PAN as chromogenic reagent has been proposed. In the presence of CTMAB,a stable red complex between Cu(Ⅱ) and PAN is formed in the buffer solution of pH1.3～4.5.The apparent molar absorptivity is 2.09×10 4L·mol -1 ·cm -1 at 558nm.The RSD is 0.8%(n=4).Beer’s law is obeyed for 0～80μg/25ml of Cu(Ⅱ).The linear correlation coefficient is 0.9998.展开更多
A spectrophotometric method is suggested in order to determine the metals leached with HNO 3 on the polystyrene filter, on which air borne dust are collected with a low volume sampler.The method, which gives parallel ...A spectrophotometric method is suggested in order to determine the metals leached with HNO 3 on the polystyrene filter, on which air borne dust are collected with a low volume sampler.The method, which gives parallel results similar to AAS method and with the same accuracy, can reasonably be applied to routine analysis of Ni, Cu and Co in air borne dust in the workshop.展开更多
In the acid medium,nitrite can diazotize with p-nitroaniline（PNA）and then couple with diethyl malonate（DM） in basic medium to produce an azo compound,which has the maximum absorption at 496 nm and a molar absorpti...In the acid medium,nitrite can diazotize with p-nitroaniline（PNA）and then couple with diethyl malonate（DM） in basic medium to produce an azo compound,which has the maximum absorption at 496 nm and a molar absorptivity(ε496) of 1.7×104L·mol-1·cm-1.A new spectrophotometric approach for nitrite determination was established on such basis with a detection limit of 1.7×10-7 mol/L.Beer’s law was obeyed in the concentration range of 0.05μg/mL-0.80 μg/mL for sodium nitrite.The proposed method has been applied for the determination of nitrite in vegetables,and the results are satisfactory.展开更多
文摘A simple method for the determination of chlorine, phosphorus and sulfur in Fuzi by ion chromatography has been proposed. The sample was ashed at 600℃ in the presence of Na 2CO 3 and extracted with boiling water. Separation of chlorine, phosphorus and sulfur in the form of Cl -, HPO 4 2- and SO 4 2- was carried out on an anion exchange resin column with a solution of 1 0×10 -3 mo1/L Na 2CO 3 4 0×10 -3 mo1/L NaHCO 3 as mobile phase. The linear ranges for the determination of Cl -,HPO 4 2- and SO 4 2- are (0 2～15 0)×10 -6 g/mL, (0 9～25 0)×10 -6 g/mL and (3 0～25 0)×10 -6 g/mL with correlation coefficients of 0 9998, 0 9981 and 0 9979, respectively; The RSDs are 4 2%, 3 9% and 3 2% respectively; The ranges of recovery are 95 0%～105%, 92 0%～107% and 91 0%～100%, respectively.
文摘A direct spectrophotometric method for the determination of micro copper in aluminum alloy using PAN as chromogenic reagent has been proposed. In the presence of CTMAB,a stable red complex between Cu(Ⅱ) and PAN is formed in the buffer solution of pH1.3～4.5.The apparent molar absorptivity is 2.09×10 4L·mol -1 ·cm -1 at 558nm.The RSD is 0.8%(n=4).Beer’s law is obeyed for 0～80μg/25ml of Cu(Ⅱ).The linear correlation coefficient is 0.9998.
文摘A spectrophotometric method is suggested in order to determine the metals leached with HNO 3 on the polystyrene filter, on which air borne dust are collected with a low volume sampler.The method, which gives parallel results similar to AAS method and with the same accuracy, can reasonably be applied to routine analysis of Ni, Cu and Co in air borne dust in the workshop.
文摘In the acid medium,nitrite can diazotize with p-nitroaniline（PNA）and then couple with diethyl malonate（DM） in basic medium to produce an azo compound,which has the maximum absorption at 496 nm and a molar absorptivity(ε496) of 1.7×104L·mol-1·cm-1.A new spectrophotometric approach for nitrite determination was established on such basis with a detection limit of 1.7×10-7 mol/L.Beer’s law was obeyed in the concentration range of 0.05μg/mL-0.80 μg/mL for sodium nitrite.The proposed method has been applied for the determination of nitrite in vegetables,and the results are satisfactory.
