差分脉冲极谱法测定苯胺中微量硝基苯

建立了测定苯胺中微量硝基苯的差式微分脉冲极谱法。试验发现硝基苯在-0.57V(vs.Ag/AgCl)处有一个良好的差分脉冲极谱峰。硝基苯质量浓度在1～600μg/mL的范围内,质量浓度与差分脉冲极谱峰的峰高呈线性关系。此法简便、快速、灵敏,结果准确。     

废水及空气中微量苯胺的极谱法分析

用极谱方法分析环境中的苯胺污染物的含量,苯胺重氮化反应产物再与亚硫酸钠、甲醛的反应物有一灵敏的二阶导数极谱波,峰电位-0.71V(vs、SCE)。研究了影响因素,优化了分析条件。线性范围在8.0×10-7～5.0×10-4mol/L,可用于废水与空气中微量苯胺的测定。     

气相色谱法测定MDI废水中微量苯胺及硝基苯

用标准萃取液萃取样品中苯胺及硝基苯，经气相色谱毛细管柱GC／FID测定样品中的苯胺及硝基苯，以保留时间定性，峰高定量。     

微量铬的极谱测定

1 前言粮食、食品、生物样品及头发、血、尿、工厂废水、废渣中微量铬的测定可采用极谱测定法。该法具有操作简便、灵敏度高、干扰少等优点。 2 原理在氨性介质中,联吡啶和亚硝酸根存在下,铬滴在汞电极上可产生一灵敏的催化波电流。据此可以对微量铬进行测定。 3 实验 3.1 仪器与试剂 3.1.1 仪器 BP-2型示波极谱仪(成都仪器厂)。实验采用三电极系统,甘汞电极为参比电极,铂电极为辅助电极,滴汞电极为工作电极。导数部分。     

含硝基苯、苯胺工艺废水的处理方法

含硝基苯、苯胺工艺废水毒性大稳定性强、生化性差,采用普通方法很难处理,本文采用铁碳预处理加生化处理工艺方法,达到排放标准。     

示波极谱法测定2—氰基—4硝基苯胺

本文采用单扫描示波极谱法测定２－氰基－４－硝基苯胺。最佳底液条件为０．１ｍｏｌ／Ｌ ＮａＯＨ，５％乙醇。导数峰电位－０．７６Ｖ（ｖｓ．ＳＣＥ）。检出下限为５μｇ／Ｌ，工作曲线至少在０～６０ｍｇ／Ｌ浓度范围内可用于实际样品的测定。常见的离子对环产生干扰。用本法测定了多种样品和生产过程中的中间产品，效果良好。     

废水中苯胺测定方法的对比验证

对测定废水中苯胺的几个方法作了对比验证 ,试验表明 ,改进后的方法能达到与原来苯胺测定方法相类似的结果 ,误差在允许范围内。认为改进后的苯胺测定方法是可行的、适用的。     

硝基苯还原生产苯胺安全性评价

苯胺是一种重要的有机化工原料,目前国内生产均采用硝基苯气相加氢还原工艺.本文对苯胺生产安全性进行了评价分析,存在物质危险性和生产工艺危险性.     

树脂吸附苯胺废水的研究

用树脂吸附法处理苯胺污水 ,通过正交实验对影响树脂吸附量的因素进行了研究 ,同时对树脂吸附循环次数进行了探索。研究表明 ,在一定条件下 ,采用树脂吸附的方法可以处理苯胺污水 ,处理后的污水 ,能达到国家排放标准     

Preparation of Ni/bentonite catalyst and its applications in the catalytic hydrogenation of nitrobenzene to aniline

Ni supported on bentonite was prepared by the impregnation method with different nickel contents, applied to the hydrogenation of nitrobenzene to aniline in a fixed-bed reactor, and it was characterized by X-ray diffraction(XRD), H_2-temperature programmed reduction(H_2-TPR), and X-ray photoelectron spectrometry(XPS). The results showed that Ni/bentonite catalyst with 20 wt% nickel content provided a higher conversion of nitrobenzene and selectivity of aniline compared to other catalysts. Ni O was the precursor of the active component of the catalyst, and the small crystallite size as well as the highly dispersed Ni O on the Ni/bentonite-20 catalyst, contributed to the catalytic performance. The hydrogenation of nitrobenzene was carried out at 300 °C with a H_2 gaseous hourly space velocity of 4800 ml·(g cat)~(-1)·h~(-1)and a nitrobenzene liquid hourly space velocity of4.8 ml·(g cat)~(-1)·h~(-1)over Ni/bentonite-20. A 95.7% nitrobenzene conversion and 98.8% aniline selectivity were obtained. While the nitrobenzene liquid hourly space velocity was 4.8 ml·(g cat)~(-1)·h~(-1), the yield of aniline was more than 95.0% during a 10-hour reaction.     

HSB／A^2-O2工艺在苯胺和硝基苯混合废水处理中的应用

采用HSB生物菌剂,适用的微生物固定化技术和A^2-O2工艺治理苯胺、硝基苯混合废水,处理后的废水各项指标达到排放标准。由于无剩余污泥产生,不仅简化了流程,运行成本也降低。     

硝基苯、苯胺混合废水的生化处理实践

硝基苯（NB）、苯胺（An）废水均属难降解废水。针对这一特性,采用生化法进行综合处理,根据调试数据显示,发现效果比较理想,处理后的出水水质达到国家规定的一级排放标准（GB8978—1996）：An〈1 mg／L,NB〈2mg／L．COD〈100mg／L,此工艺方法是可行性。     

毛细管色谱法测定试剂苯胺中的有机残留物质

建立一种毛细管气相色谱法测定苯胺中的硝基苯等残留量,用于替代原有的示波极谱法.用Restek的SE-52毛细管气相色谱柱、FID检测器,以硝基苯、环己胺、环己酮为内标进行测定.结果:硝基苯、环己胺、环己酮的线性范围分别为5～1 000 μg/mL、8～1 000 μg/mL、7.5～1 000 μg/mL,检出限分别为...     

The electrocatalytic oxidative polymerizations of aniline and aniline derivatives by graphene

Graphene oxide (GO) on a glassy carbon (GC) electrode was directly reduced at −1.0 V in a phosphate buffer (pH 4.15) to form graphene/GC electrode, which was used for the electrocatalytic oxidative polymerizations of aniline, o-aminophenol, and m-aminophenol in the acidic solutions using cyclic voltammetry, amperometric and potentiometric methods. Cyclic voltammograms demonstrate that the oxidation peak of aniline on the first cycle shifts from 1.13 V on the bare GC electrode to 0.76 V on the graphene/GC electrode. In addition, both amperometric and potentiometric methods also demonstrate that graphene can effectively catalyze the electrochemical oxidative polymerization of aniline. Cyclic voltammetry confirmed that graphene can pronouncedly catalyze the electrochemical oxidative polymerizations of o-aminophenol and m-aminophenol, but graphene oxide hardly catalyzes the electrochemical oxidative polymerizations of aniline and its derivatives. The ESR spectrum of graphene is quite different from that of graphene oxide.     

硝基苯精制再沸器爆炸事故的探讨

分析了硝基苯精制再沸器爆炸的原因,探讨了如何防止硝基苯精制再沸器的爆炸事故,并提出硝基苯生产安全运行的预防措施。