超高效除草剂氟噻乙草酯

氟噻乙草酯是由日本组合化学公司研制,并与诺华公司(现为先正达公司)共同开发的酰亚胺类除草剂。以邻氟苯胺为起始原料,经酰化、氯化制得中间体4-氯-2-氟乙酰苯胺,再与氯磺酸反应后经还原、水解制得中间体取代的硫酚,经醚化,制成硫代异氰酸酯,最后与肼缩合,并与光气合环即得目的物。主要用于玉米田、大豆田防除阔叶杂草,使用剂量为5～10g a.i./hm2。     

氮肥工业与21世纪的生物能源

介绍近年来美国生物能源的开发进展情况及其先进的支撑系统，提出如何使我国氮肥工业在发展我国生物能源中起促进作用。     

Study on Effect of Compounding Sulfurized Isobutylene with Thisester

Oxygen is introduced into the sulfurized isobutylene by compounding the sulfurized isobutylene with thioester,This paper studies the synergistic effet of commingling the sulfurized isobutylene with thioester during testing in the four-ball maching and the hihg-speed Timken maching ,Tests in the four-ball machine and the high-speed Timken machine have revealed an improvement in EP perforance of sulfurized isobutylene in admixture with thiosester The interfacial tension test and electrochenical analysis of anodic polariztion have discovered increase of adsorptive force of the additive package on metal surface following compounding sulfrized isobutylene with thioester,The XPS and AES analyees indicate to the formation of FeS,Fe2O3 and FeSO4,on the metal surface.The sulfurized film formed by the additive package on the metal surface is thicker than that formed by simple sulfurized isobutylene.     

介绍一种戊二醛含量的测定方法

本文介绍了一种简单快速的戊二醛含量的分析方法，这是利用了戊二醛还原四唑蓝形成甲而显色的原理。戊二醛在碱性条件下加热还原四唑蓝成为有色的甲，用乙酸乙酯萃取甲，再以分光光度法测定其含量。作者用此方法测定了国产２５％戊二醛水溶液含量为１４．７％，与作者用气相色谱法测定同一批号试剂戊二醛所得含量１６．１％相接近，但前者具简便快速的特点，适用于电镜工作者及一般生物实验室使用。