共查询到20条相似文献，搜索用时 578 毫秒
1.
一、有机类污染和无机类污染
（1）有机类污染：污染物为有机物,如未经处理的食品厂、化工厂有机废水．不太严重的有机营养类污染一般通过生态系统的自动调节能力,一段时间可恢复,其一般过程是：营养物质增多→水体耗氧细菌繁殖→溶解氧减少, 相似文献
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高校化工实训室对环境的污染及其控制 总被引：1，自引：0，他引：1
分析了高校化工实训室的污染及危害．高校化工实训室污染环境的原因在于：缺乏规章制度和对实训室的监管,化工实训的特殊性及设计不合理,污染处理技术相对落后等．控制高校化工实训室污染应加强立法、执法和实验室管理;增强环保意识;改变实验模式;提高实训室防治污染的能力． 相似文献
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目的：评价日立7600—110自动生化分析仪电解质模块测定钾钠氯离子的精密度、线性和携带污染率。方法：采用日立公司配套试剂和病人血清,用该仪器测定钾钠氯离子,根据有关公式计算相关数据。结果：批内及批间的变异系数均小于1％,其回归系数R均大于0．9995,携带污染率均小于1％。结论：日立7600—110电解质模块测定样本快速准确,具有测定线性好、携带污染率低的优点,适于医院检验科及实验室使用。 相似文献
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蔬菜污染与防治对策研究 总被引：1，自引：0，他引：1
我国是一个蔬菜生产大国,蔬菜的污染主要来自两个方面：一是生产基地生态环境受到污染,如土壤、水质、大气遭受＂三废＂或重金属等污染;二是蔬菜生产过程中化学农药、化肥的大量施用、残留与转化等,本文在收集资料的基础上对蔬菜污染现状进行了调查,着重分析了残留农药对蔬菜的污染,并提出相应的防治措施即：农业防治措施、生物防治措施、科学合理的施用农药,制定相关管理的措施。 相似文献
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山东蔬菜种植区农村环境污染现状及对策初探 总被引：4，自引：0，他引：4
本文对山东蔬菜种植区农村的环境污染现状进行了简要分析,认为污染因素主要有五个方面：农药、养殖、肥料、生活垃圾和蔬菜废弃物。并为防治农村污染提出了相应的对策。 相似文献
7.
教材分析本课主要分为三部分。第一部分：大气污染问题。空气与我们的生活密切相关,随着社会的发展,空气的质量状况越来越差,大气的污染严重影响着人们的健康。教材中图片显示了工业废气、废物排放和汽车尾气排放对大气的污染,人们已经意识到了大气污染的严重性,开始制定法律法规保护大气不受污染。第二部分：白色污染。白色污染是人类自己创造的垃圾,白色污染因其污染范围广、持续时间长而成为破坏环境的恶魔。人们应对白色污染的办法是减少使用一次性塑料袋,另一个重要的方法是使用可降解塑料代替普通塑料。 相似文献
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现代生活离不开化学物质，而许多化学物质是污染源。本文从以下几方面讨论了化学物质的污染以及对人体健康的影响：食品化学性污染；建筑装璜装饰材料污染；厨卫和吸烟污染；日用化学品污染；日用化妆品污染等。 相似文献
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纳米材料与农作物之间的相互作用：食品安全与启示 总被引：2，自引：0，他引：2
研究目的：通过综述作物对纳米材料的吸收途径和积累,以及纳米材料对农作物生长和营养的影响,为纳米污染在农业中的风险提供理论分析和启示。 创新要点：归纳了纳米材料被作物吸收的路径和对作物生理、遗传、营养各水平上产生的胁迫。重要结论：当前纳米与作物的研究应集中在食品安全相关的问题上,考虑农业实际情况和环境因素,分析纳米材料通过食物链富集和传递的可能性,探讨纳米材料与其他土壤有机污染物可能产生的复合污染。 相似文献
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孙艳梅 《中学课程辅导(初三版)》2006,(7):49-49
1．空气
组成：氮气、氧气、稀有气体、二氧化碳、其他气体和杂质
重要性 生物赖以生存的必需物质 重要的自然资源（用途）
污染及防治 污染物 污染的危害 防治方法 相似文献
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Achilleas Mandrikas Dimitrios Stavrou Constantine Skordoulis 《Journal of Science Education and Technology》2017,26(2):238-251
This paper describes a teaching-learning sequence (TLS) about air pollution and the findings resulting from its implementation by pre-service elementary teachers (PET) currently undergraduate students of the Department of Primary Education in the National and Kapodistrian University of Athens, Greece. The TLS focused on the relation of air pollution with wind and topography in local conditions. An authentic context was provided to the students based on daily up-to-date meteorological data via the Internet in order to estimate air pollution. The results are encouraging given that PET can correlate wind and concentration of air pollutants through reading specialized angular diagrams and weather maps, can recognize the correlation of topography in the concentration of air pollutants, and can describe temperature inversion. However, the PET demonstrated clear difficulties in ability of orientation, in wind naming, and in interpretation of symbols on weather map. Finally, the implications on teaching air pollution are discussed. 相似文献
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遂宁市大气主要污染物污染水平及变化规律 总被引：2，自引：0，他引：2
根据遂宁市2006年1月1日至2010年12月31日的环境监测数据,采用API指数法分析和评价了遂宁市大气中污染物变化规律.结果表明：各功能区的PM10的日平均浓度为0.077－0.123 mg/m^3,二氧化硫为0.030－0.043 mg/m^3,二氧化氮为0.022－0.025 mg/m^3,空气污染指数小于100.在时间变化规律上,各功能区PM10污染总体表现为第一季度污染相对稍重,其次为第二季度,再次为第四季度,第三季度污染较轻.在空间变化规律性上,以城南（群康印染厂）工业区污染稍重,次之为城西（监测站）片区,河东新区（市行政中心）环境质量最好.提示遂宁市可吸入颗粒物为空气中的主要污染物. 相似文献
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三台县城区大气环境质量分析与评价 总被引：1，自引：0，他引：1
根据2006～2007年三台县城区SO2、NO2、PM10浓度的监测数据,综合运用大气环境质量指数评价法和污染负荷分析法对三台县城区的大气质量进行分析与评价。结果表明：三台县城区主要大气污染物依次为PM10、SO2和NO2,污染程度相对较低,2007年较之2006年大气质量总体上有较大改善。SO2和PM10在2006～2007年间污染负荷均呈下降趋势,而NO2则呈现上升趋势,说明三台县城区大气污染正由煤烟型逐步向燃气型的趋势过渡。 相似文献
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Ifigenia Iliopoulou 《Education 3-13》2018,46(3):362-377
This paper reports on the thoughts 6-year-olds and 9-year-olds have related to the serious issue of air and sea pollution. More specifically, twenty seven 6-year-olds and thirty 9-year-olds attending two state schools in Volos, a small provincial town in Greece participated in the research which assessed the students’ competence to think systemically about dealing with pollution. The study sheds light on whether students are able to identify interrelations between the components of pollution, and clarifies the mental models they hold. Data was collected through drawings and interviews, subsequent analysis of which indicates that students appeared to hold two mental models related to pollution; pollution is connected both spatially and temporally with visible pollutants; and, pollution is connected indirectly with invisible pollutants. The students seemed to exhibit a kind of systemic thinking, which was done unconsciously to a certain degree. Thus it is a challenge for education to enhance students’ systemic thinking in an attempt to bring it to a more conscious level, which will assist them to reconstruct their mental models of pollution. 相似文献
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室内环境污染的危害与防治 总被引：1，自引：0，他引：1
本文通过对民用建筑室内环境污染物甲醛、苯、氡、TVOC的危害与防治的分析,阐述了提高全民室内环保意识的必要性和加强室内空气污染防治的重要性,并提出了几种防治有害污染物的措施和方法。 相似文献
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Thornber Jillian Stanisstreet Martin Boyes Edward 《Journal of Science Education and Technology》1999,8(1):67-73
School students are thought to have an insecure knowledge about the `science' of the air, yet the popular media often feature issues about air pollution, which may either confuse students further, or offer teaching opportunities. This study used a free-form questionnaire to explore 1011 year old students' ideas about the nature of air pollution, and its biological and physical effects. Many think that `gases' pollute the air, using the term in a general, non-scientific sense. However, some students can name individual pollutants (CFCs, carbon monoxide, sulphur dioxide), perhaps because they associate them with well-known environmental problems. Transport and industry were seen as the main sources of pollutants. Most students stated that air pollution will kill plants and animals. Although fewer thought this true of humans, many thought that people will become ill, with a quarter of the students raising the specific problem of asthma. Some students thought that buildings will be unaffected by air pollution, but many wrote that they would be damaged or become discolored. The view that students' ideas from out-of-school sources, coupled with their intrinsic concern for the environment, may offer starting-points for teaching curriculum science is discussed. 相似文献
18.
Taking public transit facilities (PTFs) is the major transport style in Hang Kong. Human exposure to indoor air pollutants may cause adverse health effects to the passengers. Exposure assessment on air pollutants is important for the control of human diseases caused by indoor air pollution. In this paper, the indoor PM10,CO and C02 levels in various PTFs, such as public bus, subway, railway and ferry in Hong Kong, were measured. Combining with the time budget survey of Hong Kong population, the human exposures were calculated through Monte-Carlo simulation. 相似文献
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研究分析多氯联苯近年来(1990-2005)在我国空气、土壤、水体、食品和人体中的残留水平及分布特征,提出应该亟待解决的问题和研究方向,为政府部门评价持久有机污染物多氯联苯在我国的污染状况及开展污染区域治理提供决策依据。 相似文献
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水污染问题是典型的市场失灵和政府失灵,目前为了解决这两个失灵问题,常用直接行政管制、排污削减补贴、排污收费和排污权交易这四种手段.在实施中,这四种治污手段各存不足之处,因此,从经济学的角度出发,提出了流域水污染治理的新思路:政府污染索取权与排污权交易制度结合. 相似文献