A new ion-selective pH electrode of PVC membrane used formeasuring pH of the upper digestive tract is reported in this paper, which wasprepared with tri-n-octylamine or tris-(2-ehtylhexy)amine sensitive materials,and ...A new ion-selective pH electrode of PVC membrane used formeasuring pH of the upper digestive tract is reported in this paper, which wasprepared with tri-n-octylamine or tris-(2-ehtylhexy)amine sensitive materials,and polyvinylchloride (PVC) as a base. It was shown that the electrode has widelinearity (0.5-8, 3-12), good reproducibility, proper responsible time (【30s),longer life span (15 days). And the measurement was carried out in 50 cases bythe electrode.展开更多
The construction principle of the system for determination of xanthate concentration,which consists of an Ionselective electrode(ISE) and a microprocessor based SDI analyzer,was described in the paper.The performances...The construction principle of the system for determination of xanthate concentration,which consists of an Ionselective electrode(ISE) and a microprocessor based SDI analyzer,was described in the paper.The performances of the developed system were discussed in details.The results both detected in solutions and in sulfide mineral flotation system were given; also the results by ultraviolet spectrometry were compared with those by the developed system.展开更多
电控离子交换技术(electrochemically switched ion exchange,ESIX)是将电活性离子交换材料(EXIMs)沉积或涂覆在导电基底上,通过电化学控制导电基底上活性材料氧化还原状态实现目标离子置入与释放,从而实现离子的分离。该技术具有痕量...电控离子交换技术(electrochemically switched ion exchange,ESIX)是将电活性离子交换材料(EXIMs)沉积或涂覆在导电基底上,通过电化学控制导电基底上活性材料氧化还原状态实现目标离子置入与释放,从而实现离子的分离。该技术具有痕量提取、无二次污染、速率可控、高选择性等优点。通过共沉淀法制备Ni Fe Mn LDH,并将其与碳纳米管(CNTs)、聚偏二氟乙烯(PVDF)混合涂覆到石墨板上,制得NiFeMn LDH/CNTs/PVDF膜电极。NiFeMn LDH层板上具有丰富的羟基官能团,可与W(Ⅵ)发生羟基配位;层间的阴离子与W(Ⅵ)进行离子交换,可为W(Ⅵ)提供丰富的活性位点。在ESIX系统中,膜电极对W(Ⅵ)的吸附容量可达122.10 mg·g^(-1),且W(Ⅵ)与Mo(Ⅵ)、Cl^(-)、■分离因子(■)分别为1.25、19.60、35.80,实现了W(Ⅵ)选择性分离。此外,该膜电极具有优异的循环稳定性,为钨的高效分离提供了新的方向。展开更多
Fast detection of soil nitrate has an important significance for variable rate fertilization.As NO-3ion selective electrode is easily affected by chloride ion and temperature interference in its practical application ...Fast detection of soil nitrate has an important significance for variable rate fertilization.As NO-3ion selective electrode is easily affected by chloride ion and temperature interference in its practical application for soil nutrient test,a three-layer artificial neural network model optimized by response surface methodology(RSM)was designed to reduce the interference of Cl-on NO-3ion selectivity electrode(ISE)in soil nitrate detection.The output of the model was NO-3-N concentration and three input parameters were temperature,response potential of ISE-NO-3and of ISE-Cl-.A multi-layer feed-forward(MLFF)network with one hidden layer and using gradient descent with momentum(GDM)as learning algorithm was used to develop the error correct model.By response surface methodology,a multivariate quadratic equation was developed to quantitatively describe the relationship between mean absolute error(MAE)and topological parameters of the artificial neuron network(ANN)model,then the optimum number of hidden neurons,momentum coefficient,training epoch,step size,and training runs were found.In range of 10 to 40℃,the best ANN model can correct interference of Cl-within 250 mg/kg while the primary ion concentration ranging from 5 to 250 mg/kg.For practical soil nutrient detection,the MAE could reach 8.6 mg/kg and relative standard deviation was lower than 6.5%compared with16%of no model correction.展开更多
文摘A new ion-selective pH electrode of PVC membrane used formeasuring pH of the upper digestive tract is reported in this paper, which wasprepared with tri-n-octylamine or tris-(2-ehtylhexy)amine sensitive materials,and polyvinylchloride (PVC) as a base. It was shown that the electrode has widelinearity (0.5-8, 3-12), good reproducibility, proper responsible time (【30s),longer life span (15 days). And the measurement was carried out in 50 cases bythe electrode.
文摘The construction principle of the system for determination of xanthate concentration,which consists of an Ionselective electrode(ISE) and a microprocessor based SDI analyzer,was described in the paper.The performances of the developed system were discussed in details.The results both detected in solutions and in sulfide mineral flotation system were given; also the results by ultraviolet spectrometry were compared with those by the developed system.
文摘电控离子交换技术(electrochemically switched ion exchange,ESIX)是将电活性离子交换材料(EXIMs)沉积或涂覆在导电基底上,通过电化学控制导电基底上活性材料氧化还原状态实现目标离子置入与释放,从而实现离子的分离。该技术具有痕量提取、无二次污染、速率可控、高选择性等优点。通过共沉淀法制备Ni Fe Mn LDH,并将其与碳纳米管(CNTs)、聚偏二氟乙烯(PVDF)混合涂覆到石墨板上,制得NiFeMn LDH/CNTs/PVDF膜电极。NiFeMn LDH层板上具有丰富的羟基官能团,可与W(Ⅵ)发生羟基配位;层间的阴离子与W(Ⅵ)进行离子交换,可为W(Ⅵ)提供丰富的活性位点。在ESIX系统中,膜电极对W(Ⅵ)的吸附容量可达122.10 mg·g^(-1),且W(Ⅵ)与Mo(Ⅵ)、Cl^(-)、■分离因子(■)分别为1.25、19.60、35.80,实现了W(Ⅵ)选择性分离。此外,该膜电极具有优异的循环稳定性,为钨的高效分离提供了新的方向。
文摘Fast detection of soil nitrate has an important significance for variable rate fertilization.As NO-3ion selective electrode is easily affected by chloride ion and temperature interference in its practical application for soil nutrient test,a three-layer artificial neural network model optimized by response surface methodology(RSM)was designed to reduce the interference of Cl-on NO-3ion selectivity electrode(ISE)in soil nitrate detection.The output of the model was NO-3-N concentration and three input parameters were temperature,response potential of ISE-NO-3and of ISE-Cl-.A multi-layer feed-forward(MLFF)network with one hidden layer and using gradient descent with momentum(GDM)as learning algorithm was used to develop the error correct model.By response surface methodology,a multivariate quadratic equation was developed to quantitatively describe the relationship between mean absolute error(MAE)and topological parameters of the artificial neuron network(ANN)model,then the optimum number of hidden neurons,momentum coefficient,training epoch,step size,and training runs were found.In range of 10 to 40℃,the best ANN model can correct interference of Cl-within 250 mg/kg while the primary ion concentration ranging from 5 to 250 mg/kg.For practical soil nutrient detection,the MAE could reach 8.6 mg/kg and relative standard deviation was lower than 6.5%compared with16%of no model correction.
