制药废液中氨基酸的分离与测定

为测定维生素 B12 制药厂排出的废液中氨基酸量,先在所取的废液样品中加入乙酸铅使其中蛋白质及其他大分子有机物产生沉淀并用离心法分离.上层澄清液中的氨基酸通过装有强酸性阳离子交换树脂的交换柱(25 cm×2.5 cm)予以分离,用1 mol·L-1 氨水将氨基酸从柱上洗脱.在所得洗脱液中用气相色谱-质谱及傅立叶变换红外光谱法对氨基酸进行定性及定量测定.     

Bridging the gap between membrane bio-reactor (MBR) pilot and plant studies

An integrated numerical approach was developed and implemented to study the hydrodynamic characteristics of pilot and plant systems of membrane bio-reactor (MBR). The approach incorporated Eulerian multiphase model, porous medium scheme, and also successfully took into account the vertically dependent filtration flux and the effect of mixed liquor suspended solids (MLSS) on mixed liquor viscosity. Utilizing this integrated numerical approach, a clear distinction of up-flow and down-flow regions within the pilot single module had been simulated. The simulated mixed liquor velocity and air hold-up agreed well with published experimental measurements and theoretical estimation, respectively. However, when a total of 160 modules were consolidated into an actual plant operation (i.e. Plant A), the average mixed liquor and air velocities of each module encountered a drop of approximately 50–80% lower compared to the pilot system. This implied that an approach applicable for the studies on both pilot and plant simulations was essential to identify and subsequently improve the problem. One example of optimization was by enlarging the tank size for the plant system (i.e. Plant B). With this minor design modification, the mixed liquor and air velocities were improved by 50% and noticeable up-flow and down-flow circulations were achieved.     

英平诸痹灵药酒中铜锰镍含量的分析

采用火争原子吸收分光度法测定了5种英平诸痹灵药酒中铜,锰,镍的含量,结果表明,该类药酒中镍,锰的含量较丰富,以锰的含量为最高,镍的含量次之,铜的含量相对最低。     

分光光度法测定益本昌类药酒中微量锗

用苯基荧光酮-溴化十六烷基三甲基铵分光光度法测定了益本昌药酒和益本昌风湿骨痛药酒中锗含量.结果显示,益本昌风湿骨痛药酒中锗含量(1.8512±0.0376 mg/L)比益本昌药酒(0.5481±0.0169 mg/L)丰富.探讨了该类药酒中锗与疗效的关系.     

ICP-AES手动扫描光电测定微量钪

用ICP -ABS手动扫描光电测定硫酸钛白母液中微量钪 ,考察了基体及硫酸的存在对钪发射强度的影响 ,并采用标准加入法扣除样品基体的影响。本法无需经过分离、富集等预处理 ,方法简便、快速。     

蒸煮液中的水分对纸浆卡伯值在线测量的影响分析

本文结合制浆造纸工业,对水分进行了光谱定性分析,探讨了在制浆蒸煮过程中水分对纸浆卡伯值在线分析系统的影响,确立了在蒸煮液中木素浓度在线测量的合适波长,避开了在蒸煮液中的水分对测量结果的影响,为后续的研究工作打下了基础     

芦苇浆黑液在流化床上的热解实验研究

为了掌握芦苇浆黑液的热解行为,利用流化床在530、580、630、680、730和780 ℃ 六个床温下对芦苇浆黑液在氮气氛围下的热解过程进行了实验研究,分析了床温对气相产物、碳的转化率、NO_x和SO₂的排放浓度、焦油成分和热解焦微观形貌的影响。结果表明,热解气中的主要成分为CO、CH₄、CO₂和H₂,床温的升高有利于H₂和CO的生成,而不利于CH₄和CO₂的生成;可燃气体积分数随着床温的升高而升高,其值从59.2%(530 ℃)升高到66.1%(780 ℃);床温较高时,热解产生的焦油量较少,其中,多环芳烃化合物的相对含量较多,该值在780 ℃时最高为46.88%。     

超声/PFS联合对造纸黑液处理的研究

对苇浆黑液进行超声与PFS/H2O2的协同预处理研究。结果表明：它们的联合处理与单独用PFS/H2O2处理相比较。CODcr的去除率提高12.49%-14.41%；可节约PFS14%，H2O250%-80%；实验也表明，处理效果与探头的辐射面积关系不大，同时一味增加电功率，效果也不明显，由此推断，这与黑液成分复杂有关。     

电化学法制备甘露醇阴极液中还原糖的测定

根据电化学制备甘露醇反应体系特征，研究了分光光度法测定阴极液中的还原糖，标准曲线回归方程为Y=0．2151ρ-0．0021，r=0．9999，25倍量的甘露醇和山梨醇对还原糖的测定基本无干扰，阴极液中的加标平均回收率为100．2％。     

Ion-selective electrodes in potentiometric titrations; a new method for processing and evaluating titration data

A new method to convert the potential of an ion-selective electrode to concentration or activity in potentiometric titration is proposed. The advantage of this method is that the electrode standard potential and the slope of the calibration curve do not have to be known. Instead two activities on the titration curve have to be estimated e.g. the starting activity before the titration begins and the activity at the end of the titration in the presence of large excess of titrant. This new method is beneficial when the analyte is in a complexed matrix or in a harsh environment which affects the properties of the electrode and the traditional calibration procedure with standard solutions cannot be used. The new method was implemented both in a method of linearization based on the Grans's plot and in determination of the stability constant of a complex and the concentration of the complexing ligand in the sample. The new method gave accurate results when using titrations data from experiments with samples of known composition and with real industrial harsh black liquor sample. A complexometric titration model was also developed.