According to the principles of simultaneous equilibrium and electronic charge ne utrality,the thermodynamics of Sn（IV）-NH4+-Cl--H2O system under no rmal condition was calculated. Relation between all sorts of comple...According to the principles of simultaneous equilibrium and electronic charge ne utrality,the thermodynamics of Sn（IV）-NH4+-Cl--H2O system under no rmal condition was calculated. Relation between all sorts of complex of Sn4+ and pH was plotted. Based on thermodynamics analysis and calculation,some e xperiments were done to validate the relation between the total concentration of tin ion and pH in this system. The results suggest that the total concentration of ammonium and pH are the most important factors which determine whether （NH 4）2SnCl6 or （Sn（OH）4） exists in this system. Results further suggest whe n contnet of HCl is more than 6 mol/L,Sn4+ in this system will be also p recipitated in the form of （NH4）2SnCl6. These results lay the solid theory foundation to prepare pure （NH4）2SnCl6,a promising substitution for SnCl 4·5H2O to prepare antimony doped tin oxide（ATO） and indium tin oxide（ITO）,from the tinny material.展开更多
The influence of different NH 4 +/NO 3 - ratios on nitrogen metabolism of cotton was studied under controlled hydroponics.The results showed that compared with single nitrate nutrition,solutions with 25/75,50/50,75/25...The influence of different NH 4 +/NO 3 - ratios on nitrogen metabolism of cotton was studied under controlled hydroponics.The results showed that compared with single nitrate nutrition,solutions with 25/75,50/50,75/25 and 100/0 of NH 4 +/NO 3 - significantly increased the soluble protein accumulation in leaves and roots of cotton,and the maximum content of soluble protein in leaves and roots appeared respectively in the solution with 50/50 and 75/25 of NH 4 +/NO 3 -.The soluble protein content in roots was increased with the increase of NH + 4 percentage,but was slightly less in the solution of 100/0 than 75/25,which was probably related to the excess NH + 4 limiting boot metabolism.With the increase of NH + 4 percentage,the nitrate content in petiole and the nitrate reductase activity in functional blade declined,but ammoniac nitrogen content increased in every organ of cotton.These results showed that foreign nitrogen affected the nitrogen metabolism of cotton in a different way,and the nitrogen absorption by cotton was probably related to different forms of foreign nitrogen.展开更多
文摘According to the principles of simultaneous equilibrium and electronic charge ne utrality,the thermodynamics of Sn（IV）-NH4+-Cl--H2O system under no rmal condition was calculated. Relation between all sorts of complex of Sn4+ and pH was plotted. Based on thermodynamics analysis and calculation,some e xperiments were done to validate the relation between the total concentration of tin ion and pH in this system. The results suggest that the total concentration of ammonium and pH are the most important factors which determine whether （NH 4）2SnCl6 or （Sn（OH）4） exists in this system. Results further suggest whe n contnet of HCl is more than 6 mol/L,Sn4+ in this system will be also p recipitated in the form of （NH4）2SnCl6. These results lay the solid theory foundation to prepare pure （NH4）2SnCl6,a promising substitution for SnCl 4·5H2O to prepare antimony doped tin oxide（ATO） and indium tin oxide（ITO）,from the tinny material.
文摘The influence of different NH 4 +/NO 3 - ratios on nitrogen metabolism of cotton was studied under controlled hydroponics.The results showed that compared with single nitrate nutrition,solutions with 25/75,50/50,75/25 and 100/0 of NH 4 +/NO 3 - significantly increased the soluble protein accumulation in leaves and roots of cotton,and the maximum content of soluble protein in leaves and roots appeared respectively in the solution with 50/50 and 75/25 of NH 4 +/NO 3 -.The soluble protein content in roots was increased with the increase of NH + 4 percentage,but was slightly less in the solution of 100/0 than 75/25,which was probably related to the excess NH + 4 limiting boot metabolism.With the increase of NH + 4 percentage,the nitrate content in petiole and the nitrate reductase activity in functional blade declined,but ammoniac nitrogen content increased in every organ of cotton.These results showed that foreign nitrogen affected the nitrogen metabolism of cotton in a different way,and the nitrogen absorption by cotton was probably related to different forms of foreign nitrogen.
