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151.
152.
重庆市的可持续发展与生态环境建设 总被引:4,自引:0,他引:4
重庆市我国最大的直辖市,长江上游的经济中心,水陆交通枢纽,西部大开发战略的实施给它带来了升载难逢的发展机遇,它将成为开发西部的重要突破口和增长极,但目前严重的环境污染已成为制约重庆社会经济可持续发展的重要因素,本文首先从可持续发展的角度对重庆市生态环境的污染现状及原因进行剖析,分析了重庆市生态环境建设面临的各种机遇和挑战,最后指出了解决重庆市生态问题的主要对策措施。 相似文献
153.
154.
昆明盘龙江水质的突变性研究 总被引:3,自引:0,他引:3
应用紫露草微核技术对盘龙江水质进行监测,监测结果显示整条江水质呈现出轻重不一的污染段面,北仓、洪家村样点水质具有较高的微核率,微核率分别为6.85%,7.50%,城区河段致紫露草微核的潜在性污染物较轻,最低点为油管桥样点,微核率为4.35%,但从整体来看,由松花坝微核率3.20%至滇池的附近洪家村增至7.5%,水体的潜在性致突变物污染程度逐渐加重。这表明盘龙江水体可能存在致突变的危险性。 相似文献
155.
水中不同铅浓度(5—500μg/l)急性致毒使白鲢血液中δ-氨基乙酞丙酸脱水酶(ALA-D)活性随铅浓度的增加而呈线性关系下降.温度越高,铅对酶活性的抑制越明显。0.1ppm汞、镉、铜,0.008ppm滴滴涕和0.84ppm对硫磷急性致毒,除对硫磷外对草鱼血ALA-D活性皆没有显著性影响.锌、镉、铜分别与铅混合,降低铅对ALA-D酶的抑制作用,致毒四天,可恢复甚至刺激鱼血ALA-D酶活性.被重金属(包括铅)污染的S湖中白鲢血ALA-D酶表现出明显的抑制作用,但鲤鱼血ALA-D酶却测不出抑制作用 相似文献
156.
以激光诱导荧光法测定大气飘尘中的苯并[a]芘。方法的检测限为0.01μg·l~(-1),降低了常规荧光法的检测限。综合溶剂提取、柱色层及纸色层分离技术,测定了上海市某些地区大气飘尘样品中苯并[a]芘的含量。 相似文献
157.
158.
Zhengzheng Zhang Hong Li Hongyan Liu Runxiang Ni Jinjuan Li Liqun Deng Defeng Lu Xueli Cheng Pengli Duan Wenjun Li 《环境科学学报(英文版)》2016,28(9):71-81
Atmospheric aerosol particle samples were collected using an Ambient Eight Stage(Non-Viable) Cascade Impactor Sampler in a typical urban area of Beijing from 27 th Sep.to 5th Oct.,2009.The surface chemistry of these aerosol particles was analyzed using Static Time of Flight-Secondary Ion Mass Spectrometry(Static TOF-SIMS).The factors influencing surface compositions were evaluated in conjunction with the air pollution levels,meteorological factors,and air mass transport for the sampling period.The results show that a variety of organic ion groups and inorganic ions/ion groups were accumulated on the surfaces of aerosol particles in urban areas of Beijing;and hydrophobic organic compounds with short-or middle-chain alkyl as well as hydrophilic secondary inorganic compounds were observed.All these compounds have the potential to affect the atmospheric behavior of urban aerosol particles.PM1.1–2.1and PM3.3–4.7had similar elements on their surfaces,but some molecules and ionic groups demonstrated differences in Time of Flight-Secondary Ion Mass Spectrometry spectra.This suggests that the quantities of elements varied between PM1.1–2.1and PM3.3–4.7.In particular,more intense research efforts into fluoride pollution are required,because the fluorides on aerosol surfaces have the potential to harm human health.The levels of air pollution had the most significant influence on the surface compositions of aerosol particles in our study.Hence,heavier air pollution was associated with more complex surface compositions on aerosol particles.In addition,wind,rainfall,and air masses from the south also greatly influenced the surface compositions of these urban aerosol particles. 相似文献
159.
Polybrominated diphenyl ethers in background surface soils from the Yangtze River Delta (YRD), China: occurrence,sources, and inventory 总被引:1,自引:0,他引:1
Yan-Ping Duan Xiang-Zhou Meng Chao Yang Zhao-Yu Pan Ling Chen Ran Yu Feng-Ting Li 《Environmental science and pollution research international》2010,17(4):948-956
Purposes
Very few data for polybrominated diphenyl ethers (PBDEs) were available in the Yangtze River Delta (YRD), one of the most developed and urbanized region in China. In this study, Chongming Island, located at the estuary of the Yangtze River, was selected as background area to investigate the occurrence, sources, and inventory of PBDEs. 相似文献160.
Jin Ma Li-bo Pan Qin Wang Chun-ye Lin Xiao-li Duan Hong Hou 《Environmental geochemistry and health》2018,40(1):295-301
A total of 60 children (31 males and 29 females) between the ages of 3 and 12 years were randomly selected from Lanzhou City in Gansu Province, northwest China. Hand (soil/dust) SD samples from these children were collected using hand wipes. We determined the approximate amounts of hand SD and the concentrations of three tracer soil elements (Ce, Y, and V) in these samples. The approximate amounts of hand SD ranged from 42.28 to 173.76 mg, with a median value of 85.42 mg. In addition, the mean amounts of hand SD estimated using the concentrations of Ce, Y, and V in the samples were 4.63, 3.43, and 3.42 mg, respectively. The amount of hand SD varied greatly among the age groups: primary school children had more hand SD than kindergarten children, males had more hand SD than females, and children from rural areas had more hand SD than those from urban areas. The rates of daily ingestion of hand SD for kindergarten and primary school children were estimated to be 7.73 and 6.61 mg/day, respectively. 相似文献