[Objective] The paper was to establish a HPLC method for quantitative determination of 80% pymetrozine·nitenpyram WG. [Method] With the mixture of acetonitrile, water and phosphate buffer （volume ratio 10：80...[Objective] The paper was to establish a HPLC method for quantitative determination of 80% pymetrozine·nitenpyram WG. [Method] With the mixture of acetonitrile, water and phosphate buffer （volume ratio 10：80：10） as the mobile phase, pymetrozine and nitenpyram in samples were separated by ODS-2 reversed phase column, and detected by UV detector at 250 nm. In addition, the results were quantified by external standard method. [Result] The linear correlation coefficients of pymetrozine and nitenpyram were 0.9995 and 0.9998; the standard deviations were 0.29 and 0.22; the coefficients of variation were 0.51% and 1.21%; and the average recoveries were 100.7% and 99.1%, respectively. [Conclusion] The method is fast and simple, and can effectively separate pymetrozine and nitenpyram, with high precision and accuracy and good linear relation.展开更多
Residence time distributions （RTDs） in horizontal fluidised beds have a huge effect on solid product properties and are infuenced by the internal design of the apparatus, e.g. the separation into different compartme...Residence time distributions （RTDs） in horizontal fluidised beds have a huge effect on solid product properties and are infuenced by the internal design of the apparatus, e.g. the separation into different compartments by weirs. Weirs can be passed in or against the overall solid transport direction, with the back-flow resulting in axial dispersion, which is a measure of the spread of the RTD. Therefore, the ratio of exchange rates at weirs under different fluidisation conditions provides information on axial dispersion. In this work, a methodology based on particle tracking velocimetry is presented to obtain information on the exchange rates of particles at weirs in horizontal fluidised beds. The internal recirculation is studied for over-flow weirs with respect to different fluidisation conditions, providing a first step towards determining the effects of weirs and fluidisation conditions on axial dispersion and RTDs in horizontal fluidised beds.展开更多
文摘[Objective] The paper was to establish a HPLC method for quantitative determination of 80% pymetrozine·nitenpyram WG. [Method] With the mixture of acetonitrile, water and phosphate buffer （volume ratio 10：80：10） as the mobile phase, pymetrozine and nitenpyram in samples were separated by ODS-2 reversed phase column, and detected by UV detector at 250 nm. In addition, the results were quantified by external standard method. [Result] The linear correlation coefficients of pymetrozine and nitenpyram were 0.9995 and 0.9998; the standard deviations were 0.29 and 0.22; the coefficients of variation were 0.51% and 1.21%; and the average recoveries were 100.7% and 99.1%, respectively. [Conclusion] The method is fast and simple, and can effectively separate pymetrozine and nitenpyram, with high precision and accuracy and good linear relation.
文摘Residence time distributions （RTDs） in horizontal fluidised beds have a huge effect on solid product properties and are infuenced by the internal design of the apparatus, e.g. the separation into different compartments by weirs. Weirs can be passed in or against the overall solid transport direction, with the back-flow resulting in axial dispersion, which is a measure of the spread of the RTD. Therefore, the ratio of exchange rates at weirs under different fluidisation conditions provides information on axial dispersion. In this work, a methodology based on particle tracking velocimetry is presented to obtain information on the exchange rates of particles at weirs in horizontal fluidised beds. The internal recirculation is studied for over-flow weirs with respect to different fluidisation conditions, providing a first step towards determining the effects of weirs and fluidisation conditions on axial dispersion and RTDs in horizontal fluidised beds.
