排序方式: 共有14条查询结果,搜索用时 15 毫秒
1.
Min Xu Zirui Liu Bo Hu Guangxuan Yan Jianan Zou Shuman Zhao Jingxiang Zhou Xianhui Liu Xueping Zheng Xiaoyan Zhang Jing Cao Mengshuang Guan Yirong Lv Yanyun Zhang 《环境科学学报(英文版)》2022,34(5):265-276
Luoyang is a typical heavy industrial city in China, with a coal-dominated energy structure and serious air pollution. Following the implementation of the clean air actions, the physicochemical characteristics and sources of PM2.5 have changed. A comprehensive study of PM2.5 was conducted from October 16, 2019 to January 23, 2020 to evaluate the effectiveness of previous control measures and further to provide theory basis for more effective policies in the future. Results showed that the aerosol pollution in Luoyang in autumn and winter is still serious with the average concentration of 91.1 μg/m3, although a large reduction (46.9%) since 2014. With the contribution of nitrate increased from 12.5% to 25.1% and sulfate decreased from 16.7% to 11.2%, aerosol pollution has changed from sulfate-dominate to nitrate-dominate. High NO3−/SO42− ratio and the increasing of NO3−/SO42− ratio with the aggravation of pollution indicating vehicle exhaust playing an increasingly important role in PM2.5 pollution in Luoyang, especially in the haze processes. Secondary inorganic ions contributed significantly to the enhancement of PM2.5 during the pollution period. The high value of Cl−/Na+ and EC concentration indicate coal combustion in Luoyang is still serious. The top three contributor sources were secondary inorganic aerosols (33.3%), coal combustion (13.6%), and industrial emissions (13.4%). Close-range transport from the western and northeastern directions were more important factors in air pollution in Luoyang during the sampling period. It is necessary to strengthen the control of coal combustion and reduce vehicle emissions in future policies. 相似文献
2.
3.
以洛阳市为例,分析了工业区、商业区、居民区、城乡结合处、城市绿地和城市主干道等不同功能区地表灰尘颗粒组成及重金属(Cu、Zn、Pb、Cd)粒级效应。结果表明:洛阳市不同功能区地表灰尘粒径分布具多峰性,分别在850~250、150~96及〈75μm出现分布峰值。不同功能区地表灰尘粒径差异显著,居民区和城市绿地细颗粒比重较大,工业区和城市主干道粗颗粒相对较多。各金属元素的质量分数粒级效应不一,Pb在工业区各粒级中质量分数最高,具粒级效应,其它功能区粒级效应不明显,Cd、Cu粒级效应明显,Cd富集更趋向于细粒(96~75和〈75μm),Cu在180~150μm粒径质量分数迅速升高,并随着粒径减小,基本呈上升趋势,除工业区和城乡结合部外,其它功能区均在〈75μm粒径达到峰值。除居民区和城乡结合部各粒径Zn分布较平均外,Zn主要富集于180~150μm粒径颗粒,且质量分数明显高于其它各粒级,粒级效应基本呈现正态分布。 相似文献
4.
矿化度是地下水化学成份测定的重要指标,在环境监测中,用重量法测定矿化度是目前普遍采用的方法。其缺点主要为费时,繁琐,耗电。本文通过测定洛阳市地下水的电导率,分析对比电导率与矿化度的关联,并进一步用回归方程确定电导率与矿化度之间的数量关系,探索出用电导率法间接测定地下水矿化度,具有快速,经济,准确的优点。 相似文献
5.
浅层地下水矿化度测定方法的探讨 总被引:2,自引:0,他引:2
矿化度是地下水化学成分测定的重要指标 ,在环境监测中 ,用重量法测定矿化度是目前普遍采用的方法。其缺点主要是费时、繁琐、耗电。本研究通过测定洛阳市地下水的电导率 ,分析对比电导率与矿化度的关联 ,并进一步用回归方程确定电导率与矿化度之间的数量关系 ,探索出用电导率法间接测定地下水矿化度 ,具有快速、经济、准确的优点 相似文献
6.
洛阳市饮用水源地水质安全研究 总被引:5,自引:2,他引:5
饮用水源安全是城市安全的基础,对城市的可持续发展起着决定性作用。采用单因子评价和综合评价相结合的方法对洛阳市2005年饮用水源水质24个指标进行评价,结果表明洛阳市地下水水质属于3类。污染较重的因子排序依次为总硬度、硝酸盐、溶解性总固体、铜、镉、阴离子合成洗涤剂、硫酸盐、亚硝酸盐、氰化物、铅。笔者认为,洛阳市只有通过水源地污染防治、生态恢复和建设、应急能力建设、预警监控体系建设、管理能力建设等具体工程方案的制定和实施,加强污染源控制、生态环境保护,提升环境监督管理能力,才能确保饮用水水源地安全。 相似文献
7.
洛阳市空气微生物污染初步调查 总被引:2,自引:0,他引:2
采用平皿沉降法对洛阳市空气微生物浓度进行了初步测定。结果表明:空气细菌、真菌和总菌的浓度分别为7448CFU/m^3、782CFU/m^3和9063CFU/m^3,真菌与总菌的浓度比值为8.64%,空气质量处于微污染水平;空气微牛物浓度空间差异显著,可分为中度污染、轻度污染、微污染和较清洁4个等级;从功能区划看,商业交通混合区污染最重,生活区和工业区空气质量最好;空气污染微生物主要为G^+球菌和交链孢,其次还有少量芽孢杆菌和青霉、曲霉、毛霉等。 相似文献
8.
洛阳盆地浅层地下水化学特征及其演化特征分析 总被引:2,自引:0,他引:2
在系统采集并分析洛阳盆地浅层地下水样品的基础上,综合描述性统计、相关性分析、运用Piper三线图、Gibbs模型以及离子比例系数等方法,对洛阳盆地浅层地下水化学特征及其形成机理进行了分析和探讨。结果表明:HCO~-_3和Ca~(2+)分别是研究区浅层地下水中优势的阴、阳离子;HCO_3-Ca和HCO_3-Ca·Mg型为主要地下水化学类型;浅层地下水TDS和总硬度的平均浓度相对较低,平均值分别为450.5 mg/L和329.3 mg/L。本区浅层地下水化学特征的形成主要受到岩石风化作用的影响,地下水水质成分主要来自于碳酸盐岩和硅酸盐岩等矿物的长期风化溶解。同时,逆向阳离子交换作用也在一定程度上影响着浅层地下水化学的形成。 相似文献
9.
10.
Wang Fazeng Wang Shengnan 《中国人口.资源与环境(英文版)》2007,5(3):85-92
The construction of an ecological city has two foundational platforms: the small platform, namely urban district or simply called as "city ecosystem"; and the big platform, namely around city district in certain region scope or also referred to as "city-region ecosystem". The construction of an ecological city must be launched in the dual spatial criteria: in city (urban district) criterion--optimizing the city ecosystem; in city-region (city territory) criterion-optimizing the city-region ecosystem. Luoyang has the bright characteristic and the typical image within cities Of China, and even in the world. The construction of an ecological city in dual spatial criteria--the city and the cityregion has the vital significance to urbanization advancement and sustainable development in Luoyang. In city-region criterion, the primary mission of Luoyang's ecological city construction is to create a fine ecological environment platform in its city territory. In city criterion, the basic duty of Luoyang's ecologic city construction is to enhance the ecological capacity and benefit of the central city. 相似文献