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悬浮态TiO_2光催化降解苯系物的方法研究 总被引:6,自引:1,他引:6
以高压汞灯为光源 ,在TiO2 粉末悬浮体系内 ,系统地研究了光照时间、光照距离、催化剂用量、苯系物浓度和溶液pH、空气流量、H2 O2 浓度、Fe3+ 浓度等因素对模拟水样中苯系物的光催化降解效率的影响。研究结果表明 ,当光照时间为 2 0min、光照距离为 6cm ,TiO2 用量为 4 0 0mg L、pH =7、苯系物浓度为 10 0mg L ,空气流量为 4 0 0mL min,苯系物降解率可达 93% ,添加H2 O2 与Fe3+ 能增加苯系物的降解率 ,当H2 O2 浓度为 6mmol L ,Fe3+ 浓度为 0 2mmol L ,苯系物可完全降解。实验测定精密度RSD为 0 5 %。 相似文献
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Changpeng Zhang Hua Zhao Lifeng Ping Xiaoming Cai Min Wu Hongmei He 《Journal of environmental science and health. Part. B》2013,48(5):319-323
This study investigated the degradation of rizazole in water-sediment systems (West Lake system, WL; Beijing–Hangzhou Grand Canal system, BG) with two different types of sediments under aerobic and anaerobic conditions. The half-lives of rizazole in the WL water phase (14.59–15.13 d) were similar to those in the BG water phase (15.90–16.46 d). Within 3–7 d, the rizazole concentration in the sediments reached the maximum values, i.e., equilibrium. Rizazole dissipation was faster in the WL sediment phase with higher organic matter content (T1/2 = 18.99–19.09 d) compared with the BG sediment phase (T1/2 = 31.08–33.32 d). Rizazole degradation was slightly faster in the West Lake water-sediment system (WL system) (T1/2 = 17.11–18.05 d) than in the Beijing–Hangzhou Grand Canal water—sediment system (BG system) (T1/2 = 20.51–25.02 d). The aerobic degradation of rizazole was similar to its anaerobic degradation in the water-sediment system. The findings are useful to understand the behavior of pesticide in environment. 相似文献
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采用石墨电极对含α-氯代环己基苯基甲酮的氯化清洗水进行电化学降解。结果表明,电化学降解对COD的去除效果非常明显,并且随着电流密度增加,COD的去除效率逐渐升高,电流密度由15 mA/cm2增加至100 mA/cm2, COD的去除率从39.7%升高到72.3%;电化学降解作用下,水样可生化性显著提高,降解2 h后,(BOD5)/(COD)由原水的0.22提高到0.46;电化学降解过程中,COD的降解遵循零级反应动力学方程;此外,还对电化学降解过程中α-氯代环己基苯基甲酮的降解途径进行了推测。 相似文献
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苯基周位酸生产废水处理试验研究 总被引:7,自引:0,他引:7
采用CHA-111大孔吸附树脂对苯基周位酸生产过程排放的汽提苯胺盐析废水和苯基周位酸酸析母液进行处理试验,效果良好。汽提苯胺盐析废水苯胺质量浓度>1600mg/L,经树脂吸附处理后苯胺质量浓度<2mg/L,苯胺去除率>99.9%,COD去除率>97%,树脂工作吸附量达120g/L,脱附率>98%;苯基周位酸酸析母液经树脂吸附、混凝沉淀处理后,苯基周位酸质量浓度<190mg/L,苯基周位酸去除率为94.8%,COD去除率为94.3%,氨基值去除率为80%,脱附率>99%。 相似文献
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荆国芳 《生态与农村环境学报》1995,(2)
在小区试验条件下,对胺苯黄隆的除草效果进行了观察,并对其在移栽油菜上的药害和对后茬水稻的残留危害作了描述。结果表明,胺苯黄隆有较高的除草效果。在使用剂量超过15g每公顷(有效成份计,下同)时,对当季油菜的药害和后茬水稻的二次药害非常明显,可造成油菜籽产量下降30.96%~57.81%,并可使下茬水稻减产9.34%~23.20%。 相似文献
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异烟酸-吡唑啉酮光度法测定氰化物的方法研究 总被引:1,自引:0,他引:1
研究了用次氯酸钠代替氯胺 T为活性氯试剂进行测定的方法 ,比较了这两种试剂对测定条件、结果的影响 ,且对蒸馏预处理方法进行了改进 ,并提出了在蒸馏预处理及异烟酸 -吡唑啉酮分光光度法测定过程中的注意事项 相似文献
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meso-四(3-氯-4-甲氧基苯基)卟啉二阶导数分光光度法测定废水中痕量汞(Ⅱ) 总被引:4,自引:0,他引:4
本文基于Hg(Ⅱ)meso四(3氯4甲氧基苯基)卟啉(T(3Cl4MOP)P)Twen80显色体系,提出一种高灵敏度二阶导数分光光度法测定工业废水中的痕量汞(Ⅱ),研究了汞配合物的形成条件。在pH72~79的中性介质中和Tween80的存在下,沸水浴加热6min,反应进行完全。汞(Ⅱ)量在18~104μg/L范围内符合比尔定律,二阶导数分光光度法测定汞(Ⅱ)的表观摩尔吸光系数ε4526,4616=988×106L·mol-1cm-1,检出限为18ng/ml。方法用于工业废水中痕量Hg(Ⅱ)的测定,结果满意。 相似文献
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高效液相色谱-电感耦合等离子体质谱联用测水中有机汞 总被引:1,自引:1,他引:0
建立了高效液相色谱-电感耦合等离子体质谱联用技术(HPLC-ICP-MS)测定水样中甲基汞、乙基汞、苯基汞等3种有机汞的分析方法。采用醋酸铵-L-半胱氨酸缓冲盐及甲醇体系组成的流动相按一定比例进行梯度洗脱,Agilent Zorbax Plus C18柱分离,经前处理的水样在液相色谱中分离后,进入电感耦合等离子体质谱检测其甲基汞、乙基汞、苯基汞的浓度。3种有机汞化合物均在0.50~50.0μg/L范围内呈良好的线性关系,线性相关系数均大于0.999 5。仪器检出限为0.09~0.12μg/L,方法检出限为0.4×10-6~0.6×10-6mg/L,3种有机汞样品加标的RSD均小于11.3%,2个水平的加标回收率为74.4%~83.2%。 相似文献
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Clarence Madhosingh Winson Orr 《Journal of environmental science and health. Part. B》2013,48(5):587-604
Abstract The biological effects of clofibrate (ethyl p‐chlorophenoxy‐isobutyric acid) on the growth and metabolism of the soil‐borne wheat pathogen Fusarium culmorum, were examined. In mid log phase (16 hr) cultures both phenylalanine uptake and secondary spore production were stimulated at 0.1 μM concentration; the net sterol content was reduced 50% at 0.35 μM; oxygen uptake was stimulated at 0.1 mM; growth was inhibited 50% at 0.1 mM concentration. Both phenylalanine and oxygen uptake were inhibited at 1.0 mM and pyruvate dehydrogenase activity was reduced 50% at 50 mM concentration of clofibrate. The data indicate that clofibrate affects a number of biological and enzyme systems. The inhibitory effect on the growth of the pathogen suggest a potential use of hypolipidemic agents like clofibrate as an antifungal agent for seed protection. 相似文献
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