H2O浓度对强电离放电等离子体脱硫影响研究

脱除SO2过程中,H2O起着重要作用,采用强电场电离、分解H2O,生成的强氧化剂OH·将SO2直接氧化成H2SO4。就H2O浓度对强电离放电脱硫的影响进行了实验研究。结果表明,H2O浓度的越高则SO2脱除率越高;改变H2O浓度可以在不同流量下取得相同的脱硫效果;也可以根据H2O浓度来控制等离子体反应时间从而提高脱硫效果;SO2脱除率最高可达100%。     

全自动消解-电感耦合等离子体质谱法测定土壤中16种元素

采用HNO_3-HF-HClO_4消解体系,建立了全自动消解-电感耦合等离子体质谱仪测定土壤中~(75)As、~9Be、~(51)V、~(55)Mn、~(59)Co、~(60)Ni、~(63)Cu、~(66)Zn、~(98)Mo、~(111)Cd、~(138)Ba、~(205)Tl、~(208)Pb、~(107)Ag、~(52)Cr、~(121)Sb等16种元素的新方法。通过碰撞池技术和编辑干扰元素校正方程有效校正了质谱干扰,并用内标校正了土壤基体干扰。用土壤标准物质GSS-13验证该方法,其校准曲线相关系数大于0.999 9,方法检出限在0.005~0.5μg/g之间,RSD为0.22%~2.35%,加标回收率为92%~114%。采用该方法测定实际土壤样品,加标回收率为93%~123%。     

Decomposition of gaseous CF2CIBr by cold plasma method

The paper presented the results regarding the decomposition of gaseous CF₂ClBr by cold plasma method.After two minutes discharge,the maximum decomposition rate of 2660 Pa CF₂ClBr pure and 2660 Pa CF₂ClBr plus 7980 Pa O₂ reached 60% and 80%,respectively.The paper also studied the cold plasma gas phase chemistry reaction mechanism of CF₂ClBr at low pressure,and the pressure effects of CF₂ClBr and added gas(He,N₂,O₂ and dry air)on the CF₂ClBr decomposition respectively by cold plasma method.These studies will be helpful to application of cold plasma method in the treatment of hazardous gaseous wastes.     

Prenatal diagnosis of Hunter syndrome using fetal plasma

The X-linked Hunter syndrome or mucopolysaccharidosis II was diagnosed in a male fetus by demonstrating a severe deficiency of iduronate 2-sulphate sulphatase activity in fetal plasma obtained by umbilical fetal blood sampling at 23 weeks of pregnancy. The diagnosis was confirmed after termination of pregnancy.     

Pregnancy-associated plasma protein A: A possible marker in the classification and prenatal diagnosis of Cornelia de Lange syndrome

The concentration of human placental lactogen (hPL), pregnancy specific beta-1 glycoprotein (SP-1) and pregnancy-associated plasma protein A (PAPP-A) were analysed in consecutive serum samples from a patient who gave birth to a child with Cornelia de Lange syndrome. HPL and SP-1 were present in normal concentrations from week 20 to week 35 of gestation whereas PAPP-A could not be detected in any of the samples examined. Immunohisto-chemical examination of two placentae from Cornelia de Lange syndrome revealed normal localization of hPL and SP-1 but the absence of PAPP-A from the syncytiotrophoblast. The significance of association between Cornelia de Lange syndrome and compromised synthesis of PAPP-A is discussed.     

Effects of salinity on activities of H+-ATPase, H+-PPase and membrane lipid composition in plasma membrane and tonoplast vesicles isolated from soybean (Glycine max L.) seedlings

The effects of NaCI stress on the H^＋-ATPase, H^＋-PPase activity and lipid composition of plasma membrane(PM) and tonoplast(TP) vesicles isolated from roots and leaves of two soybean cultivars( Glycine max L. ) differing in salt tolerance(Wenfeng^7,salt-tolerant; Union, salt-sensitive) were investigated. When Wenfeng^7 was treated with 0.3% (W/V) NaCI for 3 d, the H^＋ -ATP aseactivities in PM and TP from roots and leaves exhibited a reduction and an enhancement, respectively. The H^＋ -PPase activity in TP from roots also increased. Similar effects were not observed in roots of Union. In addition, the increases of phospholipid content and ratios of phospholipid to galactolipid in PM and TP from roots and leaves of Wenfeng^7 may also change membrane permeability and hence affect salt tolerance.     

等离子体降解水相中有机污染物的机理研究

研究了等离子体在内电极通氧条件下降解水相中甲基紫的机理。研究表明，甲基紫的降解率与等离子体的电压和处理时间呈线性关系、与甲基紫溶液的浓度呈指数关系，溶液的pH随着处理时间的增加而下降：100mg/L甲基紫经等离子体外理3s，其降解率可达95%以上，COD下降50%左右；在等离子体条件下，甲基紫溶液的降解是氧原子、电子、活性自由基和离子等共同的作用的结果。     

内燃机尾气电离放电脱除NOX研究

论及强电离放电非平衡等离子体技术应用于净化内燃机尾气中NOX的研究.分析了强电离放电产生等离子体净化内燃机尾气原理,主要讨论了折合电场强度对NOX脱除率的影响.当折合电场强度达到6.24×104 V/cm时,NO的脱除率达到91%;当折合电场强度达到6.76×104 V/cm时,NOX的总体脱除率达到49.3%的最高水平.     

高压脉冲电晕放电等离子体降解废水中苯酚

考察了多种因素对高压脉冲电晕放电低温等离子体法降解水中苯酚效果的影响 .提高脉冲电压峰值和放电频率、延长放电时间等均可大大提高降解效果 .自由基清除剂如正丁醇和缓冲剂如硼酸盐的存在均会显著降低降解效果 .1 0 0mg·L- 1苯酚废水溶液放电处理 1 80min ,最高降解率达 67 3 % .当放电处理 42 0min时 ,废水的TOC下降 83 8% .     

等离子体与光催化复合技术净化污水处理泵站臭气

用一种等离子体-光催化复合技术净化污水处理泵站臭气,研究表明该复合技术具有较显著的协同促进效应,通过改变等离子体发生单元与光催化单元的距离以及在两者之间放置去静电网,可消除等离子体单元产生的负电荷对光催化单元的不利影响,进一步提高其复合效应.同时还对这一复合技术产生协同效应的机理进行了分析,并在污水处理泵站实地考查了这种复合技术对臭气的净化效果.该技术对臭气中NH3的降解率可达46.1%,对H2S的降解率可达67.3%.