Simultaneous determination of malachite green, enrofloxacin and ciprofloxacin in fish farming water and fish feed by liquid chromatography with solid-phase extraction

An effective and sensitive method for simultaneous analysis of malachite green (MG), enrofloxacin (ENFLX) and ciprofloxacin (CPFLX) by liquid chromatography-diode array detection with solid-phase extraction (SPE) is developed. The conditions of SPE and LC were investigated and optimised. The effective separation of these compounds was achieved using a ZY1104 C18 column (250 × 4.6 mm, 5 μm) with 20 mM tetrabutyl ammonium bromide (pH 3.0)-acetonitrile as mobile phase and gradient elution. The diode array detection was used at 278 nm for ENFLX and CPFLX and at 613 nm for MG. Under the optimal conditions, the method LOD values of MG, ENFLX and CPFLX were 0.01, 0.07 and 0.10 μg L(?-1) for fish farming water samples and 1.5, 10.5 and 15 μg kg(?-1) for fish feed samples, respectively. The relative recoveries of the three analytes were achieved to be 76.7-82.3% with the RSDs (n = 5) of 3.2-4.6% for spiked fish farming water samples and 78.8-93.7% with the RSDs (n = 5) of 3.1-4.8% for spiked fish feed samples.     

油田含油污泥综合利用污染控制标准研究

通过国内外油田含油污泥处理和综合利用的调研,确定了黑龙江省油田含油污泥的处理和综合利用途径主要有填埋处理、农用、垫井场和通井路、公路路基土方。DB23/T 1413-2010《油田含油污泥综合利用污染控制标准》最终将油田含油污泥中的石油类等11项指标,作为油田含油污泥用于垫井场和通井路或农用综合利用的污染控制指标。     

铁铬合金在塑性变形时温度对强化的影响

对当前在化工、石油等行业中广泛使用的耐蚀铁铬合金,在塑性成形中的主要工艺参数做了实验研究。在不同成形温度和变形程度下,其制件所得的机械性能相差较大,生产中可根据制件的要求,选择合理的工艺参数。     

欧洲污染物排放与转移登记制度简介

污染物排放与转移登记制度（简称PRTR制度）,是发达国家为了对化学污染物质进行更严格的管理而实行的一种管理制度。该制度起源于1984年,最早实行的是荷兰,其后美国、欧盟、澳大利亚、加拿大、韩国、日本等国家也相继实施了PRTR制度。本文着重介绍了欧盟污染物排放与转移登记制度的发展历史,并就EPER和E—PRTR进行了简单的比较。     

A/O工艺污水处理厂FCASM3-Hydro耦合模型及现场校验

在全耦合活性污泥模型(FCASM3)基础上,考虑生物场与水力流场的相互作用,建立了A/O工艺污水处理厂FCASM3-Hydro耦合模型.通过Matlab/Simulink软件平台进行数值模拟,将A/O工艺污水处理厂FCASM3-Hydro耦合模型分别与已报道的生物场一水力场耦合模型(Lee -Hydro)以及FCASM2-Hydro耦合模型进行数值模拟对比研究.结果表明,FCASM3-Hydro耦合模型对出水中COD、NH4+-N、Nox--N、PO43--P等污染物质变化趋势的动态模拟比Lee-Hydro耦合模型更符合实际.在对出水COD的模拟上,FCASM3-Hydro与FCASM2一Hydro耦合模型的模拟值完全一致;在对出水NH4+-N和PO43--P的模拟上,FCASM3-Hydro耦合模型的动态模拟结果比FCASM2-Hydro耦合模型更贴近实测变化趋势.     

辽宁省海城市西荒地地热资源及其医疗价值初探

本文对辽宁省海城市西荒地地热田的区域地质构造、地热水的赋存状况进行了分析,在对地下热水化学组份分析的基础上,探讨了本区地下热水在医疗及医疗旅游方面的价值,以及在此方面开发利用的前景.     

生物去除H2S废气装置中EPS的提取和分析方法

为了研究生物滴滤塔去除H2S的生物膜降解机理,采用超声波法剥落滴滤塔内填料上的生物膜,在超声25 min时可以获得较好的提取效果;采用苯酚硫酸法测定胞外聚合物多糖时回收率为98.1%,具有较好地稳定性,简单、方便。     

生态理念在社会主义新农村建设规划的应用——以乌川湖村清洁田园工程为例

在结合湖南省长沙县乌川湖村社会主义新农村环保“四洁”示范村建设背景下,对鸟川湖村田园污染现状及存在的问题进行了全面地调查和系统地剖析的基础上,利用生态学原理和方法探究了治理田园污染的有效措施,进一步对乌川湖村清洁田园工程建设规划进行了研究,其中主要有：化肥、农药减控工程;白色污染防治工程;废弃物回收利用工程;土壤污染治理工程以及绿色、有机食品工程,探讨社会主义新农村建设的生态化之路。     

三苯基锡对紫萍生长及酶活性的毒性作用

以紫萍作为实验生物,通过研究不同浓度的三苯基锡对紫萍（Spirodela polyrrhiza L．）根叶生长、多酚氧化酶（PPO）活性、过氧化氢酶（CAT）活性和过氧化物酶（POD）的影响,为及时发现和排除三苯基锡的污染提供理论和直观依据。结论表明：培养4d后,三苯基锡处理对紫萍叶片生长量的IC50为0．71mg／L。相同培养液条件下,PPO、CAT和POD均随着三苯基锡处理浓度的升高呈现先升高后下降的趋势。从中可以说明三苯基锡对紫萍有明显的毒性作用。     

Photocatalytic degradation of methyl orange using ZnO/TiO2 composites

ZnO/TiO₂ composites were synthesized by using the solvothermal method and ultrasonic precipitation followed by heat treatment in order to investigate their photocatalytic degradation of methyl orange (MO) in aqueous suspension under UV irradiation. The composition and surface structure of the catalyst were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and transmission electron microscopy (TEM). The degradation efficiencies of MO at various pH values were obtained. The highest degradation efficiencies were obtained before 30 min and after 60 min at pH 11.0 and pH 2.0, respectively. A sample analysis was conducted using liquid chromatography coupled with electrospray ionization ion-trap mass spectrometry. Six intermediates were found during the photocatalytic degradation process of quinonoid MO. The degradation pathway of quinonoid MO was also proposed.