简介：Thevolatilizationkineticsofantimonytrisulfideinsteamatmospherewasstudiedwiththermogravimetryattemperaturesfrom923to1123K.Atheoreticalmodelwasdevelopedtocalculatetheoverallrateconstantandthemasstransfercoefficientingasphases.Theexperimentalresultsshowthatthevolatilizationrateisenhancedwithincreasingtemperatureandsteamflowrate.Thevolatilizationrateismainlycontrolledbythemasstransportingasphases.Theapparentactivationenergyfortheprocessisfoundtobe59.93kJ/mol.ItisdemonstratedthatSb2S3isdominantlyoxidizedintoSb2O3andH2Sbywatervaporinthevolatilizationprocess.Someantimonymetalisformed.Thereactionmechanismisdiscussedinaccordancewithexperimentaldata.

简介：我们进行了在沙的土壤和黏土变得在土壤侧面在表面水，通过来自稻地的挥发的氨的损失，大米生产，氮使用效率，和氮内容里在NH4+-N的集中上决定氮申请层次的效果的大米的地试用。表面水和通过挥发失去的氨的数量里的NH4+-N的集中与增加氮申请水平增加了，并且在氮申请以后在1-3d达到顶点。更少的氨比从沙的土壤从黏土经由挥发被失去。在氮申请不同取决于舞台以后，当它被使用时，氨的数量经由挥发输了，从最高的损失到最低：支持tillering的N申请>支持圆锥花序开始的第一N顶肥(在最后4叶阶段适用)>基础化肥>支持圆锥花序开始的第二N顶肥(在最后2叶阶段适用)。经由从黏土的挥发的氨的全部的损失是10.49-87.06kg/hm2，到氮的10.92%-21.76%的等价物适用。经由从沙的土壤的挥发的氨的全部的损失是11.32-102.43kg/hm2，到氮的11.32%-25.61%的等价物适用。在表面水里经由挥发和NH4+-N的集中失去的氨的数量在氮申请以后同时达到顶点；在tillering的两个都显示出的最大值与在他们之间的比率上演从23.76%～33.65%。随氮申请水平的增加，在植物的米饭生产和氮累积增加了，但是氮使用效率减少了。在植物的瑞斯生产和氮累积比在沙的土壤在黏土是稍微更高的。在土壤，氮内容在40-50厘米的深度是最低的。在任何特定的土壤层，土壤氮内容与增加氮申请增加了水平，和土壤氮内容比在沙的土壤在黏土是更高的。以氨挥发，当氮申请水平在种季节的米饭超过了250kg/hm2时，经由挥发失去的氨的数量显著地增加了。为米饭生产，然而，合适的氮申请水平是约300kg/hm2。因此，为高庄稼收益和环境保护考虑需要，适当的氮申请水平是处于这些条件的250-300kg/hm2。

简介：MicrometeorologicalandmicroplotexperimentswereconductedinthefieldoffreshlyharvestedgreencaneinQueensland,Australia.ResultsshowedthathighammonialossoffertilizerNcouldoccurunderrelativelydryconditionswhenureaorcommercialproductofmixtureofureaandmuriateofpotashwereappliedtothesurfaceofsugarcanetrash.ThemoisturecontentinthetrashandthepHoffertilizerweretwoimportantfactorscontrollingtheprocessesofureahydrolysisandammoniavolatilization.MostoftheNinthesoilwastransformedtothenitratel-nitritefromafter70daysoffertilizerapplication.Nosignificantleachingwasfound.Urea-freeNfertilizershadhigherNrecoveriescomparedtourea-containingfertilizers.

简介：ThisstudyinvestigatedthevolatilizationkineticsofleadinpelletsmadeofZn-Pb-bearingdustsmixedwithcoalpowder,inanitrogenatmosphereandinthetemperaturerangebetween1100℃-1300℃,andshowedthatthereductiontemperaturehasasignificanteffectonthevolatilizationrateofleadandthatneithertheparticlesizeofthecoalpowdernortheextracarboncontenthasanyeffectonthevolatilizationrate.Theobtainedactivationenergyforthevolatilizationofleadis88.74kJ/mol.Thevolatilizationrateofleadiscontrolledbyboththeleadevaporationreactionandthediffusionofgaseousleadthroughthegasboundarylayercoveringthesurfaceofthereducedliquidlead.