流动注射分光光度法测定水中硫化物

采用流动注射分光光度法测定水中的硫化物，在酸化条件下，通过在线蒸馏释放出H：S气体，在酸性介质中与对氨基二甲基苯胺和三氯化铁反应，形成亚甲基蓝，于660nm处比色测定。方法检出限为0．004mg／L，精密度和准确度均较好，操作简便，能满足大批量水样及时准确分析的需求。     

流动注射微波在线消解分光光度法测定水中总磷

利用微波在线消解水样,将流动注射分析技术与分光光度法检测相结合,建立一种在线测定水中总磷的快速分析方法。通过对实验条件的优化,分析速率达36个/小时,检出限0.015mg/L,线性范围为0~2.0mg/L,对0.634mg/L总磷标准溶液测定11次的相对标准偏差为1.0%。应用于环境水样的测定,结果令人满意。     

流动注射氯化亚锡还原光度法测定水中总磷

建立了流动注射氯化亚锡还原光度法测定水中总磷的方法.改进了氯化亚锡的配制方法,优化了试验条件,方法检出限为0.02 mg/L,精密度与准确度均符合要求.应用该方法测定天然水样,分析速度加快,结果令人满意.     

综放采空区防灭火注氮数值模拟与参数确定

用有限元数值方法 ,求解了综放开采采空区注氮情况下的漏风渗流方程和氧浓度渗流耗散方程 ;结合计算机图形技术 ,直观展示了注氮前后采空区流场、流态和氧浓度分布动态变化 ;模拟了在不同注氮量下注氮控制区边界的变化过程 ,得到控制区边界位置与注氮流量呈负指数关系 ;重点探讨了用数值模拟方法确定合理注氮参数 (注氮流量、注氮位置和注氮时间 )的新方法。     

Combustion performance and emission characteristics on HCCI engine of waste plastic pyrolysis oil biodiesel blends with external PFI and vaporiser

ABSTRACT

Analysis of plastic oil obtained from waste plastic through pyrolysis process, as an alternative to biodiesel is presented in this paper. The HCCI engine is considered for experimental validation of combustion performance and emission characteristics. To accumulate pyrolysis oil as fuel, the design modifications were made in external mixture formation on the existing computerised 4-stroke, single cylinder, water cooled, direct injection kirloskar diesel engine connected with eddy current dynamometer to satisfy HCCI conditions. HCCI engine can be worked on wide assortment of fuels beginning from diesel to different blends (WPPO 5%,10%,15% and 20% by volume) of biodiesel .The designed additional device connected to the engine is utilised for fuel vaporisation and mixture arrangement. In the experimental study, the combustion results were initiate to be of 39.69 % higher Rate of Heat Release (RoHR) for biodiesel HCCI as compared with diesel HCCI. Higher brake thermal efficiency (BTE) was found 37 % without exhaust gas recirculation (EGR) at WPPO 20 % biodiesel blend. And also found 50 % and 65 % reduction in NOx emission and 18 % and 28 % reduction in smoke opacity are obtained for biodiesel vapour induction without EGR and biodiesel vapour induction with 15 % EGR as compared with diesel fuel. The CO (0.34 %), and UHC (2.15 %) emissions are increases with 15 % EGR, but the emissions are within the standard limits specified by the emissions standards.     

注水采油对中原油田生态环境的影响分析

随着近30年来中原油田高强度、大面积的石油开采，高强度注水采油和超采地下水造成的负面效应日益凸现。通过地下水位下降，地下漏斗面积增大，地面沉降，地裂缝，土壤、水体污染五个方面阐述了注水采油带来的生态环境问题，以及由此导致的对公共设施和建筑物的破坏、水土污染等严重后果。     

流动注射-氢化物发生-原子吸收法测定土壤中微量砷

用混酸消解土壤试样，用体积分数为20％的盐酸作酸介质，质量分数为1．5％的硼氢化钾作还原剂，体积分数为1％的盐酸作载液，采用流动注射-氢化物发生三-原子吸收法定量测定土壤中的微劈砷。通过实验确定，在原子化温度为920℃、土壤中共存元素含量低于5mg／kg时对测定无干扰。该方法的榆出限为0．5μg/L，线性范嘲为5～100μg/L．相对标准偏差为0．89％，平均回收率达98．99％：     

含硫低浊度采油污水絮凝处理技术的研究

中原油田明二污属含硫低浊度污水,处理后水主要用于回注。文章通过pH调节剂的优选、除硫剂优选并与絮凝药剂联合,对明二污含硫低浊度污水进行了絮凝处理。结果表明:当pH值为7.5、2#絮凝剂加量为50mg/L、有机絮凝剂加量为0.5mg/L、除硫剂加量为20mg/L时,处理后水中的悬浮物、总铁和含油量分别达到1.9mg/L、0.43mg/L和0mg/L;SRB、TGB均为102个/mL;腐蚀速率及结垢量分别降到0.062mm/a和1.9mg/L;污泥产生量降低到0.23～0.26mg/L;在90℃时的结垢量由地层水的23.3mg/L降低到1.9mg/L,处理后的水达到中原油田回注水的水质标准,并且水质稳定。     

Injection Molded Biocomposites from Soy Protein Based Bioplastic and Short Industrial Hemp Fiber

Biocomposites from soy based bioplastic and chopped industrial hemp fiber were fabricated using twin-screw extrusion and injection molding process. Soy based bioplastics were prepared through cooking with plasticizer and blending with biodegradable poly(ester amide). Mechanical, thermal properties and fracture surface morphology of the “green”/biocomposites were evaluated with universal testing system (UTS), dynamic mechanical analysis (DMA), Environmental Scanning Electron Microscopy (ESEM). It was found that the tensile strength and modulus, flexural strength and modulus, impact strength and heat deflection temperature of industrial hemp fiber reinforced biocomposites significantly improved. The fracture surfaces showed no signs of matrix on the fiber surface suggesting poor interfacial adhesion.     

在线浓缩-流动注射分光光度法测定海水中痕量的镉

本文针对海水中镉含量低、海水基体干扰严重等特点，建立了在线浓缩一流动注射分光光度法测定海水中痕量镉的新方法。优化了Cd（Ⅱ）的显色条件、浓缩条件和解吸条件，在最佳检测条件下，Cd（Ⅱ）的检出限为0．02μg/L，线性范围为0．05～2μg/L，相对标准偏差RSD为2.74％（n=g，Ccd（Ⅱ）=1μg／L）。将该方法应用于实际海水中Cd（Ⅱ）的测定。结果满意。