脉冲电晕低温等离子体提高一氧化氮氧化效率的实验研究

提高一氧化氮（NO）的氧化效率对于提高生物法处理该类废气的净化效率具有重要意义。实验研究了低温等离子体在脉冲电晕条件下氧化废气中NO的过程,考察了不同峰值电压、氧气含量、气体停留时间和添加有机物等因素对提高NO氧化效率的影响。结果表明：低温等离子法可有效地提高NO的氧化效率,主要产物为NO₂;室温条件下,当进气NO浓度590 mg/m³、脉冲频率50 Hz时,增大峰值电压、气体停留时间和进气中的氧气含量可提高NO的氧化效率;在最适峰值电压15 kV,气体停留时间5 s时,NO氧化效率为20%;在进气NO中添加甲苯、乙醇后,NO氧化效率可增加至30%以上,甲苯的效果要好于乙醇。     

高效液相色谱-电感耦合等离子体质谱法测水中不同形态砷

采用高效液相色谱(HPLC)分离水中两种常见的砷形态As(III)、As(V),电感耦合等离子体质谱系统进行检测鉴定,利用C8色谱柱,探讨了甲醇含量、磷酸二氢钾浓度、四丁基氢氧化铵浓度、p H等测试条件,由此建立了水中砷形态的分析方法。结果表明,以1.5 mmol/L磷酸二氢钾、2 mmol/L四丁基氢氧化铵(TBAOH)、5%甲醇作为流动相,调节流动相为p H 5.5,流速为1.4 m L/min,上述两种不同形态的砷可在5.5 min内得以有效分离,As(III)、As(V)检出限分别为0.001、0.01μg/L,定量下限分别为0.005、0.03μg/L。该方法实现了对水中常见的不同形态砷(As(III)、As(V))的同时分析,具有灵敏度高、选择性好、检测速度快的特点,在水质分析领域具有重要意义与应用价值。     

氨基化有机-无机杂化整体柱分离富集环境水中五价砷

将四乙氧基硅烷(TEOS)和N-(β-氨乙基)-γ-氨丙基三乙氧基硅烷(AEAPTES)作为共聚前体,采用在毛细管内原位聚合的方式制备得到氨基功能化的有机-无机杂化整体柱,将其作为针式固相微萃取(SPME)介质,建立了现场分离富集环境水中As(V)的SPME方法,优化了有机-无机杂化整体柱富集As(V)的实验条件,并研究了整体柱对As(V)的吸附/洗脱性能和富集能力,实现了环境水样中As(V)的高效、快速、高选择性检测。     

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% .