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排序方式: 共有909条查询结果,搜索用时 15 毫秒
851.
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853.
Shan Dan Wei Wang Jinghui Ren Yali Li Hua Hu Zhengfeng Xu Tze Kin Lau Jianhong Xie Weihua Zhao Hefeng Huang Jiansheng Xie Luming Sun Xiaohong Zhang Weipeng Wang Shixiu Liao Rong Qiang Jiangxia Cao Qiufang Zhang Yulin Zhou Haiyan Zhu Mei Zhong Yi Guo Linhua Lin Zhiying Gao Hong Yao Hongyun Zhang Lijian Zhao Fuman Jiang Fang Chen Hui Jiang Songgang Li Yingrui Li Jun Wang Jian Wang Tao Duan Yue Su Xiuqing Zhang 《黑龙江环境通报》2012,32(13):1225-1232
854.
855.
Fang Liu Chunyang Liao Jianjie Fu Jungang Lv Qinzhao Xue Guibin Jiang 《Environmental geochemistry and health》2014,36(1):65-77
The residue levels of 16 US EPA priority polycyclic aromatic hydrocarbons (PAHs) and 16 selected organochlorine pesticides (OCPs) in rice and rice hull collected from a typical e-waste recycling area in southeast China were investigated from 2005 to 2007. PAHs and OCPs also were measured in ten mollusk species (soft tissues) collected in an adjacent bay in 2007. Individual PAHs were frequently found in the entire sample set (including the rice, hull, and mollusk samples) with a detection rate of 73 %. The total concentrations of 16 PAHs (ΣPAHs) and 16 OCPs (ΣOCPs) were in the range of 40.8–432 ng/g dry weight (mean: 171 ng/g) and 2.35–925 ng/g (122 ng/g), respectively, which were comparable or higher than those reported in some polluted areas. Statistical comparisons suggested that the concentrations of contaminants in hull gradually decreased from 2005 to 2007 and the residue levels were generally in the order of mollusk, hull, and rice, on a dry weight basis. Principal component analysis in combination with diagnostic ratios implied that combustion of coal, wood, and plastic wastes that are closely associated with crude e-waste recycling activities is the main source of PAHs. The finding of decreasing trend of concentrations of PAHs in this area is consistent with the efforts of local authorities to strengthen regulations on illegal e-waste recycling activities. Composition analysis suggested that there is a recent usage or discharge of hexachlorocyclohexane and dichlorodiphenyltrichloroethane into the tested area. The estimated daily intake (EDI) of ΣPAHs and ΣOCPs (calculated from mean concentrations) through rice and mollusk consumption was 0.411 and 0.921 μg/kg body weight (bw)/day, respectively. 相似文献
856.
为研究增塑剂邻苯二甲酸二异壬酯(diisononyl phthalate,DINP)对小鼠肺组织的氧化损伤作用,以昆明小鼠为受试动物,随机分为5组,包括1个阴性对照组(生理盐水)和4个DINP染毒组(0.2、2、20和200 mg·kg~(-1)),灌胃14 d。光镜下发现小鼠肺组织形态随染毒剂量的增加,小鼠肺细胞的病理损伤越严重。随着DINP染毒剂量的增加,肺组织匀浆活性氧(reactive oxygen species,ROS)、丙二醛(malondialdehyde,MDA)含量和肺组织细胞DNA-蛋白质交联(DNA-protein crosslink,DPC)系数逐渐上升,还原型谷胱甘肽(glutathione,GSH)含量逐渐降低,各指标呈一定的剂量-效应关系。染毒剂量为20 mg·kg~(-1)时,ROS和MDA含量差异有统计学意义(P0.05,P0.01);染毒剂量为200 mg·kg~(-1)时,上述指标差异均有统计学意义(P0.01)。结果表明,较高剂量(≥20 mg·kg~(-1))的DINP能造成小鼠肺组织的氧化损伤和病理损伤。 相似文献
857.
光化学降解是药品及个人护理用品(PPCPs)在环境中转化归趋的重要途径之一,同时光解过程对该类化合物的生态毒性产生重要影响。本研究以抗菌药物三氯生为模型化合物,研究在紫外光照射下,三氯生初始浓度、腐殖酸含量、pH、光强对其光降解动力学的复合影响。采用发光细菌、羊角月牙藻2个不同营养级生物的毒性响应变化评价三氯生母体化合物及光降解过程中毒性变化。研究表明:三氯生光降解遵循准一级反应动力学。初始浓度为10μmol·L~(-1)、腐殖酸含量为0 mg·L~(-1),初始p H值为11、光强为0.44 m W·cm-2时,该光化学降解反应体系三氯生有最高的反应速率和降解效率。三氯生光降解过程中产生了对受试生物有较高抑制作用的中间产物,随着光降解时间的延长,光降解中间产物的毒性逐渐降低,在光降解30 min后无显著毒性。 相似文献
858.
Xiaoyan Guo Chunyu Li Chenghao Li Tingting Wei Lin Tong Huaiqi Shao Qixing Zhou Lan Wang Yuan Liao 《Frontiers of Environmental Science & Engineering》2019,13(6):81
859.
兽药抗生素对土壤微生物群落的影响 总被引:1,自引:0,他引:1
兽药抗生素广泛应用于畜禽养殖业,用于预防、治疗动物疾病及促进动物生长。然而,养殖过程中使用的抗生素不能被动物完全吸收,其中40%~90%以母体或其代谢物的形式排出动物体外并随畜禽粪便进入土壤环境,对土壤微生物群落结构和功能产生影响。在汇总了畜禽粪便和土壤中兽药抗生素的残留特征之后,概述了抗生素对土壤微生物群落结构和功能的影响以及微生物产生的污染诱导群落耐性。重点探讨了抗生素微生物毒性的影响因素和近年来对微生物共耐性方面的研究,并对未来的研究方向及目标提出了建议。 相似文献
860.
Longli BO Jianbo LIAO Yucai ZHANG Xiaohui WANG Quan YANG 《Frontiers of Environmental Science & Engineering》2013,7(3):395-402
The development of a combined process of catalytic oxidation and microwave heating for treatment of toluene waste gas was described in this work. Toluene, a typical toxic volatile organic compound, was oxidized through a fixed bed reaction chamber containing zeolite-supported copper oxide (CuO/zeolite) catalyst mixed with silicon carbide (SiC), an excellent microwave-absorbing material. The target compound was efficiently degraded on the surface of the catalyst at high reaction temperature achieved by microwave-heated SiC. A set of experimental parameters, such as microwave power, air flow and the loading size of CuO etc., were investigated, respectively. The study demonstrated these parameters had critical impact on toluene degradation. Under optimal condition, 92% toluene was removed by this combined process, corresponding to an 80%–90% TOC removal rate. Furthermore, the catalyst was highly stable even after eight consecutive 6-h runs. At last, a hypothetical degradation pathway of toluene was proposed based on the experimental data obtained from gas chromatography-mass spectrum and Fourier transform infrared spectroscopy analyses. 相似文献