多道检测-激光诱导荧光光谱分析装置研究

采用Nd∶YAG激光器为激发光源,与CCD光学多道分析系统联用建立了多 道检测-激光诱导荧光光谱分析装置,并对该装置的设计进行了优化,荧光光谱测量范围35 0～1 000 nm,波长精度0.3 nm,探测器光谱响应灵敏度0.1 LX。采集和检测了若丹明6G乙 醇溶液的高信噪比荧光谱,最低检出限达到10-8 mol/L。线性范围为10-6～10-8 mol/L。将所建立的装置用于若丹明B荧光淬灭法测定水中硒的含量,获得了满意 的结果。方法的线性范围为1～10 μg/L,检出限为0.5 μg/L,加标回收率为81.3%～112.5 %。     

在线还原富集火焰原子吸收光谱法测定环境水样中Cr(Ⅲ)和Cr(Ⅵ)的形态

采用单阀双阳离子交换树脂微柱并联，设计了双路采样逆向洗脱在线分离富集系统，该系统与原子吸收测量技术相结合，实现了在线分离富集-火焰原子吸收光谱法同时测定水中Cr(Ⅲ)和Cr(Ⅵ)，富集1min时，分析速度为60样/h，测定Cr(Ⅲ)和Cr(Ⅵ)的特征浓度分别为6．08μg/L和11．58μg/L(相当于1％吸收)，线性范围分别为0～1．0μg/mL和0～2．0μg/mL，对质量浓度为100μg/L的Cr(Ⅲ)和Cr(Ⅵ)测定的相对标准偏差分别为2．9％和3．0％、检出限分别为8．70和10．8μg/L。该法对实际水样加标回收率在94．5％～104．3％之间。     

APPLICATION OF SURFACE GRAFTED POLY N-ISOPROPYL ACRYLAMIDE BY RADIATION TECHNOLOGY FOR PROTEIN SOLUTION CONCENTRATION

Poly N-isopropyl acrylamide (abbreviated as PNIPA) as a kind of thermally sensitive hydrogel is utilized to concentrate Bovin Serum Albumin (BSA) solution. In order to decrease its surface adsorption to BSA in aqueous solution, surface layer grafting of the gels by radiation technology was carried out. The results showed that hydroxyl propyl methacrylate (HPMA) grained gel exhibited a low level of BSA adsorption and still kept the original thermally sensitive properties of PNIPA hydrogels.     

聚丙烯酸酯改性水性聚氨酯的制备

在回顾聚丙烯酸酯改性水性聚氨酯的研究历史基础上，系统地介绍了聚丙烯酸酯改性水性聚氨酯乳液（PUA）的制备方法，其中包括聚氨酯（PU）和聚丙烯酯（PA）的直接掺混法、PU和PA的乳液共聚法，接枝法，互穿网络法，核壳聚合法，对这些方法做了简单的评述，对其应用范围及前景进行了初步探讨。     

STUDIES ON IPE OF POLYACRYLAMIDE INVERSE EMULSION AND MODIFIDE UREA-FORMALDEHYDE RESIN

The selective water plugging agent was prepared by heating the blends of the polyacry-lamide inverse latex, modified urea formaldehyde resin, crosslinking agent and catalysts.The results show that using different types of polymers and additives or changing in theirproportion of the blends, the gelling viscosity, starting point of gelling and other propertiesof the IPN can be controlled.     

建筑用单组分湿固化聚氨酯密封胶的发展概况

综述了国内外建筑用单组分湿气固化聚氨酯密封胶的发展状况,并针对其面临的主要问题指出了今后发展的主要趋势。     

Study of ψ(4415) in the QPC model

Some authors consider the ψ(4415) to be the 4S or 5S excited state of a c-c pair.Starting from this assumption,we study the decays of the ψ(4415) to DD,D*D-*,DsD-s,D*SD*S~,and get the corresponding branching ratios in terms of the Quark-Pair-Creation (QPC) model.Compared with the experimental data,we find that the results of 4S state agree much better than those of the 5S state.Therefore,it is more reasonable to assume the ψ(4415) to be a 4S state.     

Pasting Muckenhoupt weights through a contact point between sets of different dimensions

We extend the result in [11] to the spaces of homogeneous type built in [2] starting from two sets of different dimensions with a unique point of contact.     

~(12)C~(6+)离子辐照对苜蓿M1代低温胁迫存活率、过氧化氢酶及过氧化物酶活性的影响

研究了不同剂量12C6+离子辐照对中兰1号、BC-04-477、塔城3种苜蓿M1代个体在低温胁迫下存活率、过氧化氢酶(CAT)及过氧化物酶(POD)活性的影响。在辐照剂量为400 Gy时,中兰1号低温胁迫组存活率、CAT活性比未辐照的对照分别提高了33.3%,56.3%,POD活性与未辐照的对照无差异;在辐照剂量为400 Gy时,BC-04-477低温胁迫组存活率、CAT及POD活性比未辐照的对照组分别提高了33.3%,69.2%,5.1%;塔城在辐照剂量为800 Gy时,低温胁迫组的存活率、CAT及POD活性比未辐照的对照组分别提高了25%,26%,22.8%。以上结果表明,12C6+离子辐照可以提高中兰1号、BC-04-477、塔城的低温环境的存活能力,提高苜蓿抗寒性能。