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61.
Qinsong Xu Han Qiu Weiyue Chu Yongyang Fu Sanjuan Cai Haili Min Sha Sha 《Environmental science and pollution research international》2013,20(12):8672-8679
Laboratory experiments were conducted to investigate copper (Cu) subcellular distribution and toxicity in Hydrilla verticillata. Fronds were subjected to different concentrations (15, 75, and 150 μM) of Cu for 7 days. Cu grains were found in cell walls, plasmodesmata, and within the nuclei and chloroplasts using the autometallographic technique. Subcellular fractionation of Cu-containing tissues indicated that in leaves subjected to high Cu concentrations, 59–65 % of the element was located in the cell wall fraction, followed by cell organelles (21–30 %) and the soluble fraction (10–14 %). The levels of K, P, Zn, and Mg declined under all Cu concentrations, but Ca, Mn, and Fe contents reached their peak at 15 μM Cu and decreased thereafter. F v/F m, F 0, and F m fell significantly in line with the decrease in pigment content. Cu exposure also caused significant damage to the chloroplasts, mitochondria, and nuclei, including disintegration of the chloroplasts and vacuolization of the mitochondria and nuclei, all of which suggested that Cu hastened plant senescence. The Cu maximum permissible concentration for H. verticillata was 10 μM, which was less than the existing general water quality standard. This suggested that H. verticillata could be used to assess Cu phytotoxicity. 相似文献
62.
Lin CJ Ho TC Chu HW Yang H Mojica MJ Krishnarajanagar N Chiou P Hopper JR 《Journal of environmental management》2005,75(4):303-313
Emission inventory is one of the required inputs to air quality models. To assist in the urban and regional modeling efforts, United States Environmental Protection Agency (EPA) has compiled a National Emission Inventory (NEI) for criterion pollutants, and the precursors of ozone and particulate matter (PM). In December 2002, EPA released the 1999 NEI estimates (NEI99), which represent the most recent national emission data. However, the data sets are not in model-ready format for air quality simulations. This present work converts the NEI99 Final Version 2 data sets into Inventory Data Analyzer (IDA) format and processes the data using the Sparse Matrix Operator Kernel Emissions (SMOKE) modeling system to generate a gridded emission inventory in a domain covering the west Gulf Coast Region, USA. The spatial and diurnal emission characteristics of the gridded emission inventories are then assessed and compared with those of the National Emission Trend 1996 (NET96). The NEI99 database contains more complete emission records in both area and point sources. It is also found that NEI99 data exhibit greater emissions with respect to point and mobile sources but smaller emissions with respect to area sources when compared to the corresponding gridded NET96 data in the same study domain. The most distinct differences between the NEI99 and NET96 databases are CO emission of mobile sources, SO2 emissions of point sources, and VOC/PM/NH3/NOx emissions of area and non-road sources. The gridded NEI99 data show low VOC/NOx ratios (<2-5) in the urban areas of the study domain. 相似文献
63.
我国粮食安全保障中改善农业环境的途径 总被引:3,自引:0,他引:3
本文分析了我国粮食安全及粮食持续生产所依托的农业环境状况。从我国粮食生产状况与经济发展水平看,全国粮食生产处于结构性过剩与低水平安全中,区域性粮食安全与不安全并存;耕地资源、水资源以及农民的经济收入状况等均不容乐观,加之自然灾害加重,粮食生产的环境成本将随之增加,这将影响我国未来粮食安全。为此,本文提出了走农业集约化道路是解决我国粮食安全与改善环境的基本途径。 相似文献
64.
Xia Xuewen Li Junqi Chen Chaoyi Lan Yuan-Pei Mao Xisong Chu Zhiyao Ning Deyang Zhang Junshan Liu Fengyuan 《Environmental science and pollution research international》2022,29(59):88866-88881
Environmental Science and Pollution Research - Tuning morphology and doping additional rare earth (RE) cations are potential techniques to promote the photocatalytic performance of ceria (CeO2),... 相似文献
65.
Xie Huiming Wang Xiaopeng Shen Manhong Wei Chu 《Environment, Development and Sustainability》2022,24(9):10752-10767
Environment, Development and Sustainability - Industrial water pollution has become one of the largest threats to China's sustainable development and human welfare. Although China has... 相似文献
66.
Fallah-Mehdipour Elahe Bozorg-Haddad Omid Chu Xuefeng 《Environment, Development and Sustainability》2021,23(9):13165-13181
Environment, Development and Sustainability - Reservoir is a hydraulic structure that regulates river water to supply different sectors’ demands such as municipal, agricultural, and... 相似文献
67.
Luo Yang Wu Yinghong Ma Shuhua Zheng Shili Zhang Yi Chu Paul K. 《Environmental science and pollution research international》2021,28(15):18727-18740
Environmental Science and Pollution Research - The rapid economic development in China places a large demand for energy, and as a result, thermal power plants in China are producing an enormous... 相似文献
68.
Observations of 2,4,6-trichlorophenol degradation by ozone 总被引:7,自引:0,他引:7
The aqueous reactivity of 2,4,6-trichlorophenol (TCP) with ozone has been studied at laboratory-scale using a simple gas bubble/liquid contacting system. Degradation rate constants were measured directly and found to be 7.6 and 77.2 M(-1)s(-1) at pH 2 and 7.5, respectively. At pH 7.5, 10 min of ozonation ( identical with 15 mM ozone consumption) achieved a 90% degradation of TCP, which corresponded to the release of approximately 2 mol Cl(-) per mol TCP. The presence of hydrogen peroxide in solution did not significantly increase the TCP degradation but increased the overall dechlorination to 2.7 mol Cl(-) per mol TCP. The presence of humic acid (HA) in solution was found to enhance the degradation rate of TCP at low relative HA concentrations (<0.6 g/g HA:TCP), but to reduce the rate at higher HA concentrations. 相似文献
69.
70.
催化光度法测定水中痕量亚硝酸根 总被引:5,自引:0,他引:5
基于亚硝酸根对溴酸钾氧化结果紫而使其褪色的催化作用,建立了灵敏的催化光度测定痕量亚硝酸根的新方法,测定范围为0.02-0.16μg/mL,用于水样中亚硝酸根的测定,获得了满意结果。 相似文献