Freeze-induced acceleration of I–oxidation and the consequent iodination of dissolved organic matter(DOM)contribute to the formation of organoiodine compounds(OICs)in cold regions.The formed OICs may be a potentially...Freeze-induced acceleration of I–oxidation and the consequent iodination of dissolved organic matter(DOM)contribute to the formation of organoiodine compounds(OICs)in cold regions.The formed OICs may be a potentially important source of risk and are very closely with the environment and human health.Herein,we investigated the acceleration effects of the freeze process on I–oxidation and the formation of OICs.In comparison to reactive iodine species(RIS)formed in aqueous solutions,I–oxidation and RIS formation were greatly enhanced in frozen solution and were affected by pH,and the content of I–and O_(2).Freeze-thaw process further promoted I–oxidation and the concentration of RIS reached 45.7μmol/L after 6 freeze-thaw cycles.The consequent products of DOM iodination were greatly promoted in terms of both concentration and number.The total content of OICs ranged from 0.02 to 2.83μmol/L under various conditions.About 183–1197 OICs were detected by Fourier transform ion cyclotron resonance mass spectrometry,and more than 96.2%contained one or two iodine atoms.Most OICs had aromatic structures and were formed via substitution and addition reactions.Our findings reveal an important formation pathway for OICs and shed light on the biogeochemical cycling of iodine in the natural aquatic environment.展开更多
在液晶面板及半导体等制造、加工过程中需要持续监控搬送距离的可优化性,减少搬送距离,节省动力用力;持续监控动态搬送路径,及时发现路径设置的不合理之处,优化搬送路径,提高搬送效率;应对工厂对产品在S T K内暂存时间履历调查的需求。...在液晶面板及半导体等制造、加工过程中需要持续监控搬送距离的可优化性,减少搬送距离,节省动力用力;持续监控动态搬送路径,及时发现路径设置的不合理之处,优化搬送路径,提高搬送效率;应对工厂对产品在S T K内暂存时间履历调查的需求。本文介绍了计算产品在工序间搬送距离的一种方法,为工厂提供批次产品搬送数据,方便优化搬送路径,节省用力。展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.22176199,21806173,and 42192571)the Jinan University and Institute Innovation Team Project(No.2021GXRC061).
文摘Freeze-induced acceleration of I–oxidation and the consequent iodination of dissolved organic matter(DOM)contribute to the formation of organoiodine compounds(OICs)in cold regions.The formed OICs may be a potentially important source of risk and are very closely with the environment and human health.Herein,we investigated the acceleration effects of the freeze process on I–oxidation and the formation of OICs.In comparison to reactive iodine species(RIS)formed in aqueous solutions,I–oxidation and RIS formation were greatly enhanced in frozen solution and were affected by pH,and the content of I–and O_(2).Freeze-thaw process further promoted I–oxidation and the concentration of RIS reached 45.7μmol/L after 6 freeze-thaw cycles.The consequent products of DOM iodination were greatly promoted in terms of both concentration and number.The total content of OICs ranged from 0.02 to 2.83μmol/L under various conditions.About 183–1197 OICs were detected by Fourier transform ion cyclotron resonance mass spectrometry,and more than 96.2%contained one or two iodine atoms.Most OICs had aromatic structures and were formed via substitution and addition reactions.Our findings reveal an important formation pathway for OICs and shed light on the biogeochemical cycling of iodine in the natural aquatic environment.
文摘在液晶面板及半导体等制造、加工过程中需要持续监控搬送距离的可优化性,减少搬送距离,节省动力用力;持续监控动态搬送路径,及时发现路径设置的不合理之处,优化搬送路径,提高搬送效率;应对工厂对产品在S T K内暂存时间履历调查的需求。本文介绍了计算产品在工序间搬送距离的一种方法,为工厂提供批次产品搬送数据,方便优化搬送路径,节省用力。
