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51.
Progress in the research on aquatic environmental nonpoint source pollution in China 总被引:1,自引:0,他引:1
ProgresintheresearchonaquaticenvironmentalnonpointsourcepolutioninChinaBaoQuansheng,MaoXianqiang,WangHuadongInstituteofEnviro... 相似文献
52.
Zhuang Dehui 《环境科学学报(英文版)》1995,7(1):31-35
EffectsoflowpHonzooplanktoninsomesuburbanwaterbodiesofChongqingCityZhuangDehui(InstituteofHydrobiology,ChineseAcademyofScienc... 相似文献
53.
Zhao Zongci 《环境科学学报(英文版)》1993,5(1):23-29
Climatic change and urbanization effect in China during the last 39 years were investigated. It is found that a warming of about 0.23℃ for the annual temperature has been noticed from 1951 to 1989. The warmings of about 0.78 ℃ in winter and 0.34 3℃ in spring have been shown. It is also presented that a cooling of about -0.27℃ in summer has been indicated. The bigger cities are warmer than smaller cities in China. The dried trends in the annual precipitation during the last 39 years were presented. The precipitation decreased obviously in summer all over China. The bigger cities were drier than smaller cities. 相似文献
54.
Two strains of bacteria were isolated from nitrile polluted soils, and identified as Corynebacterium boffmanii and Arthrobacter flavescens. Acetonitrile, propionitrile, butyronitrile and acrylonitrile were degraded by these bacteria to yield corresponding amides, carboxylic acids and ammonia. The nitrile-degrading abilities of these strains were investigated. The removal rates for the nitrile were nearly 100%, after these bacteria were grown in medium containing 10000 ppm of aceto-, propio-, or butyronitrile at 28 ℃ for 24h. When the reaction mkture consisting of 5000 ppm of above mentioned nitriles or acrylonitrile and 20g (dry cell) /L resting cells of the two strains in 0.06mol/L phosphate buffer (pH7.5) was incubated separately at 25 ℃ with moderate shaking for 15 or 45 min, the nitrile could be degraded completely. The optimum growth conditions for C.hoffmanii and A.flavescens were studied as well. 相似文献
55.
通过连续提取法对电镀废水污染区和对照区农田土壤中的重金属元素Cu、Cr、Ni、Pb和Mn形态进行了研究.结果显示,污染区土壤中多种形态的Cu、Cr和Ni含量都显著高于对照区,尤其以它们的有机结合态差异最为显著.污染区较对照区土壤中Mn的总量虽无显著差异,但可交换态Mn的含量显著增加(分别为98.68mg/kg和40.75mg/kg).污染区与对照区土壤中的Pb的交换态、碳酸盐结合态、Fe-Mn氧化物结合态、有机结合态和残留态均无显著差异.电镀废水的污染使得农田土壤中Cu、Cr和Ni含量和生物有效性显著升高,Mn的化学形态改变,移动性和生物有效性增加. 相似文献
56.
Tan Zhiqun 《环境科学学报(英文版)》1996,8(2):191-195
plane decaying leaves have been found capable of removing chromium and nickel ions from aqueous solutions. The removal efficiency depends upon the pH conditions, ions components and concentrations, and concentrations of leaves in media. The maximum removal for unique Cr6+ is about 7.5-8.0g/kg leaves at pH 4. 0, for unique Ni2+ about 2. 6g/kg at the region of PH5. 0-5.5. Under the described conditions nickel increases chromium uptake by plane decaying leaves from solution. 相似文献
57.
Wu Zhenbin Xia Yicheng Zhang Yongyuan Deng Jiaqi Chen Xitao Zhan Facui Wang Deming 《环境科学学报(英文版)》1994,6(1):13-20
PurificationandreclamationofwastewaterbyanintegratedbiologicalpondsystemWuZhenbin;XiaYicheng;ZhangYongyuan;DengJiaqi;ChenXita... 相似文献
58.
Theresearchofbelow-cloudscavengingofrainwaterinGuilinCityBaiYuhua;YaoRongkui;LiXin;TangXiaoyan(TheDepartmentofTechnicalPhysie... 相似文献
59.
Mao Meizhou Liu Zihui Dong Huiru Liu Jingyi Kathe K. Bertines Minoru Koide Edward D. Goldberg 《环境科学学报(英文版)》1991,3(1):109-116
The fluxes of heavy metals and magnetite, a fly-ash component, from coal burning, to sediments of the Kunming Lake in Beijing have increased measurably over the last fifty years. Ages were introduced to the sediment strata through Pb-210 geochronologies. Even with a doubling of coal usage by the year 2000, the anthropogenic metal fluxes will still be less than those recorded in metropolitan Tokyo and U.S. lakes. 相似文献
60.
Dunaliella tertiolecta has an ability to biodegrade dimethyl phthalate(DMP) was found in this study, and the average of the biodegradation rates were 11.3 mg/(L·d) and 30.5 mg/(L·d), and the average of the phthalic acid (PA) production rates were 1.5 mg/(L·d) and 3.6 mg/(L·d), for initial 100 mg/L and 300 mg/L DMP, respectively. The larger amount of accumulation by D. tertiolecta under higher DMP concentration may be responsible for the increase of biodegradation rate, and one of products of DMP biodegradation by D. tertiolecta may be PA. By fitting the process of DMP biodegradation by D. tertiolecta with a kinetic equation newly suggested, the standard deviations between calculated and observed values were 2.5 mg/L and 5.7 mg/L, respectively. 相似文献