浮游植物叶绿素a测定方法研究进展

叶绿素a作为评价水体富营养化水平及水生态健康的重要指标,其监测方式目前越来越受到环境监管部门及相关科研机构的重视。综述了目前常用的几种监测方法,并对每种方法的优劣进行了系统分析,发现每种监测方法都存在一定的限制条件。因此,环保部门进行例行监测或者科研机构进行长期跟踪监测时要根据监测对象的不同选择合适的方法,甚至选择几种监测方法结合的方式来进行叶绿素a的测定,以为水环境管理和科研工作提供可靠的数据支撑。     

制冷剂R134a生产技术

由西安金珠近代化工有限责任公司开发、陕西省环保局推荐的制冷剂R134a生产技术适用于汽车空调、家用电冰箱和商业制冷工质;PU及PS塑料发泡剂及医药、化妆品气溶胶喷剂等.     

Animal Rearing as a Contract?

Can animals, and especially cattle, be the subject ofmoral concern? Should we care about their well-being?Two competing ethical theories have addressed suchissues so far. A utilitarian theory which, inBentham's wake, extends moral consideration to everysentient being, and a theory of the rights orinterests of animals which follows Feinberg'sconceptions. This includes various positions rangingfrom the most radical (about animal liberation) tomore moderate ones (concerned with the well-being ofanimals). Notwithstanding their diversity, theseconceptions share some common flaws. First, as anextension of primarily anthropocentric theories (aboututility or rights) they still participate in the flawsof the original setting. Second, extending them tonon-human beings raises the problem of the borderwhich is to be drawn between what can be included inthe purview of moral consideration and what is leftoutside. Third, such theories are not able to distinguishbetween an ethics of wildlife and an ethics ofdomestic life, which too often leads to preposterousstatements. We would like to argue (i) that we should distinguishbetween environmental ethics (concerned withpopulations, species, biotic communities) and animalethics (where animals are taken into consideration individually);(ii) that individualist animal ethics are not relevantfor animal rearing; (iii) that animal rearing is a hierarchicalrelationship which rules are to be found in the fiction of a domesticcontract. Hence, we would like to construct a new conception ofthe ethics of the relation between men and the cattlethey breed based on the idea of a domestic contract.Our main assumption is Mary Midgleys's anthropologicalassumption, according to which human communities,since the Neolithic age, have always included variousanimals, so that relations of sociability have alwaysexisted between human beings and animals within thedomestic community (a mixed community). In order tospecify the hierarchical and non-egalitarian, butinclusive reciprocal obligations and relations insidesuch a community, we will elaborate on the notion ofa ``domestic contract'', an implicitly assumedidea traced back to Lucretius and whichwe will follow up to the physiocrats and Adam Smith.We will show that such an idea relies upon theassumption of communication between cattle farmer andanimals, of shared experience and exchanges betweenthe two parties. We will then show how modern factory,or battery animal farming, can be seen as unilaterallybreaking this domestic contract, forsaking ourduties towards domestic animals.     

Perceived landscape values and public participation in a road-planning process – a case study in Sweden

The European Landscape Convention indicates that assessment of different dimensions that exist in landscapes should be taken into account in planning. In this study, we first investigated ecological, cultural and social values as perceived by the local people in a highway-planning process in Sweden. Next, we explored which factors influenced the local people's participation in the road-planning process. We used questionnaires, planning documents and the Theory of Planned Behavior to investigate the relations between different factors and local people's participation in the planning process. The results showed that people presumed the ecological values in the landscape to be adversely affected by the new road, while the social values would remain the same. Landowners had heard of the participatory-process, but few participated. Those who lived within 300 m of the road were more active in the planning process than people living further away. The findings suggest that people living within a few hundred metres of the road should be treated as key stakeholders in the planning process. The involvement of other stakeholders, and when in the public participation process stakeholders should be involved, is also discussed.     

Is Eating Locally a Moral Obligation?

Advocates of eating locally offer a wide range of arguments in favor of the practice, but their ethical import is not always clear. Some locavore statements and arguments seem to imply a strong form of moral obligation; that eating locally is not merely instrumental to some other good, but has intrinsic value in its own right. This article examines standard arguments on behalf of eating locally, including arguments linked to the value of small farms and agrarianism, the environment, taste and health, trust, and relational markets. Most arguments put forward on behalf of eating locally value it instrumentally, the main exception being arguments based on relational markets. Although these arguments provide important motives for eating locally, the strength of obligation varies widely, and even the strongest arguments possess significant qualifications. While eating locally can play a role in reducing environmental impacts, this is not necessarily so, and once removed from instrumental considerations, eating locally is more likely at best an imperfect duty.     

Impact of unconfined sulphur-mine waste on a semi-arid environment (Almería, SE Spain)

Thirty-five soil samples were taken from unconfined mine waste, stream sediments, and surfaces unoccupied by mining and presumably unaffected by it, in a sulphur-mining zone surrounded by carbonate material and characterized by a semi-arid climate with short torrential storms. These samples were analysed and the results compared to estimate the spread of pollution in the landscape and to assess potential environmental risk. The mean concentrations of S, Zn, Cd, Pb, and As in mine waste were between 3.5-fold (As) and 50-fold (S) greater than unaffected soils. Oxidation of S led to a sharp drop in pH, strong weathering of minerals, and solubilisation of the constituent elements, forming a toxic acidic mine drainage with highly concentrated pollutants that were discharged into the drainage channels. Successive acid mine drainage into the soil on the valley floor spreads acidification and pollution downstream. The high carbonate content in surrounding soils played an important role in the increase of the pH and precipitation of S, Pb, and Al of the affected soils. Meanwhile, high mobility of Zn, Cd and As under basic conditions and a low Fe concentration explain the broad spread of these elements, as high concentrations were detected in soil more than 2000 m from the source. Only the soil solutions from near the waste dump (first 500 m) were highly phytotoxic, and moderately phytotoxic from 500 to 1500 m away. The concentration of pollutants in the leachates was clearly higher than in soil solutions, even in the soils located over 2000 m from the source, implying that the size of the polluted area will increase with time.     

Can ISO 14063 be a tool to plan the environmental communication strategy of a territorial area?

Over the past two decades, communication on environmental values, actions and performance has become an essential activity of organisations, because of the increased public concern and legislation related to the environment.

Stakeholders put pressure on companies to take environmental responsibility. In this framework, an effective environmental communication can generate value-added on companies' environmental work, and consequently, their competitiveness and profitability can benefit from communicating their environmental responsibility.

In 2006, the International Organization for Standardization (ISO) launched a standard for environmental communication, ISO 14063. ISO 14063 should not be used for third-party certification purposes. Instead, it is intended to be used as a guideline and support companies to ensure successful environmental communication. The aim of this paper is to prompt a discussion about the applicability of the standard ISO 14063 not only to single organisations but as a tool to plan the environmental communication strategy of a whole territorial area. This is achieved by performing a case study relating to the Interreg IVC-funded project “Progresland”. The project involved three Italian and one Spanish natural areas and demonstrated that ISO 14063 could be a valid support to define and implement an environmental communication plan for a territorial area.     

The Design of a New Energy-conservation Type Solar-powered Lighting System Using a High‐pressure Sodium Lamp

This study designs and applies a new energy-conservation type solar-powered lighting system using a high-pressure sodium lamp to areas not having any utility company's electricity. The proposed system uses a zero-voltage-switching (ZVS) DC/DC converter in the batteries’ charge circuit to reduce the switching loss for a higher charging efficiency. Said system also adopts the maximum power point tracking (MPPT) technique to maximize the solar panels’ photovoltaic conversion capability. When dark, the batteries in the proposed system will discharge, with a raised voltage, through a push-pull DC/DC converter; said voltage, as the input voltage of the series-parallel resonant inverter, will be regulated to dim the lamp. To enable the efficient usage of the batteries’ stored energy capacity, this control scheme of the proposed system may adjust the night-time discharge time lengths, according to season difference, and compute the usable capacity for the load, according to the batteries’ charged voltage, so as to select a suitable pre-scheduled light-dimming curve for the lamp to achieve energy conservation for the batteries and continuity in lighting when dark.     

地表水中浮游植物叶绿素a测定方法的探讨

探讨了分光光度法测定叶绿素a的影响因素。采用玻璃纤维滤膜抽滤水样,以90%丙酮为提取剂研磨后浸泡提取地表水浮游植物中的叶绿素a,研究滤膜种类、样品保存条件、浸提时间对叶绿素a测定的影响。实验结果表明,丙酮研磨法提取效率、实验精密度及准确度良好。     

关于叶绿素a测定萃取时间的探讨

在叶绿素a的测定过程中，萃取时间长短对测定结果产生影响，得出了萃取时间5小时可满足叶绿素a测定要求的结论。     

叶绿素a含量与大气污染评价的研究

当绿色植物受到污染大气的侵害后,叶片中叶绿素a的含量就会下降。因此,通过测定生长于一个城市上风向(大气清洁区),侧风向(轻污区),下风向(重污区)大叶黄杨(Buxaceae buxus sp.)生长功能叶片中叶绿素a含量(c),并以Ci/C上风=A作为相对评价标准,即可在排除了采样差异的前提下,较为客观地揭示城市各区污染的宏观状况。     

吐曼河近5a水质变化浅析

通过单因子评价法对吐曼河水质现状及近期变化趋势进行了分析,揭示了近几年来吐曼河水质年内及年际变化的特点,以期对吐曼河水污染治理提供参考。     

What Climate Policy Can a Utilitarian Justify?

This essay sketches out what a utilitarian should support when considering global warming along with what measures can be recommended to political leaders for utilitarian reasons. If we estimate the utility of the great advantages that any ambitious climate policy might create in the name of poverty reduction in the present, I will show how a decision can be made in favor of a vigorous climate policy based on such estimates. My argument is independent of the truth of the claims of climate sceptics. Until now, the debate has neglected the double effects of a vigorous climate policy that not only avoids risks of damages but also creates utility. In conclusion, three strategies of a climate policy legitimized by utilitarianism will be introduced: (1) Utilitarianism favors global emissions trading in comparison with a global CO₂ tax. (2) Utilitarianism calls for this trade to be introduced while, at the same time, investments in renewable energies should be increased. (3) Furthermore, utilitarianism favors a policy that aims to slow down the rate of population growth.     

Policy context as a factor of bias in the valuation of environmental goods – a dual-process theories perspective

When ecosystem services value estimates are applied in the economic assessment of environmental policies, high accuracy of these estimates is required. One of the directions in the scientific discussion on biases in stated preference (SP) valuation surveys builds on dual-process theories of judgment. The paper contributes to this literature by presenting an experiment where two types of judgment were induced via separate versus joint valuation of environmental goods. The results demonstrated that policy relevance of environmental issues, e.g. the need for conservation measures increases emotional response, causing a larger bias in the separate design as it involves ‘valuation by feeling.’ This finding suggests that the context of a specific policy, which is often the reason for conducting SP surveys, influences the answers, thereby making the results less reliable for use in cost–benefit analysis.     

Can you tell a green field from a cold steel rail? Examining the “green” of Green Infrastructure development

The rapid development of Green Infrastructure as an approach to planning has enabled landscape practitioners to implement a range of projects utilising its principles. Discussions though exist examining what Green Infrastructure is, how it should be planned, and whether it can be identified as only those elements of the landscape that are green. A further element of this argument examines the use of water within this process. Therefore, as planners, we can ask: can we tell a green field from a cold steel rail? Both may have a green or sustainable function with only the visual appearance differing. Debates, however, focus on practitioner selectivity of the interpretation of “green” infrastructure planning exploring whether physical landscape characteristics or the function of an investment is the main focus of discussion. Using the grey–green continuum developed by Davies et al. [2006. Green infrastructure planning guide project: Final report. Annfield Plain: NECF], this paper examines whether geographical differences exist in the application of the Green Infrastructure and examine how practitioners use the ambiguity of Green Infrastructure planning to guide investment. Drawing on academic and practitioner literature provides this paper with a balance of conceptual and process-based assessments evaluations of global Green Infrastructure focusing on the design and implementation of terrestrial and marine resources. This paper also examines whether the dominant landscape planning framework in each region could be considered contradictory to the wider application of Green Infrastructure principles.     

苯并[a]蓖方法试验研究

有关苯并[a]蓖的测定方法,文献上已报道较多。这些方法,实际上都基于同一原理。归纳起来,可分为四个步骤,采样、提取、分离、定性和定量。只是每个步骤中所用手段不一,从而出现多种多样的测定方法。各地区、各单位的具体条件不同,选择的方法也有所不同。到底那种方法对苯并     

Calibrating a model to 30 years of data to capture the accumulation of chloride from winter deicers in a shallow aquifer

Winter deicers are a major source of chloride contamination to shallow aquifers in northern latitudes. In the greater Chicago area of northeast Illinois, chloride has been accumulating for decades and in many places now exceeds the United States Environmental Protection Agency secondary standard of 250 mg/L. MODFLOW-NWT and MT3D-USGS were used to simulate the accumulation of chloride with 30 years of data in the shallow aquifer of Will County in northeast Illinois. This aquifer is composed of unconsolidated sediments, largely from glacial deposits, overlying a fractured dolomite bedrock. To calibrate to observed heads and chloride, the model needed refined geologic features, higher chloride concentrations on cells representing commercial or industrial lands, lower chloride concentrations on cells representing roads, and point source areas to speed chloride's emergence in the aquifer. These point sources are locally significant and could represent different anthropogenic or geologic features, such as municipal stormwater infrastructure. Future simulations indicate that chloride is not at steady state in the shallow aquifer and wells are at risk of exceeding the secondary standard if winter deicing applications are not reduced. It may take decades for the full impacts of reduced deicing rates to be observed in wells, owing to the long residence time of water in the aquifer. This transient model calibration was possible because of the 30-year dataset collected by communities and government agencies.     

Food Security: One of a Number of ‘Securities’ We Need for a Full Life: An Australian Perspective

Although agriculture in Australia is very productive, the current food supply systems in Australia fail to deliver healthy diets to all Australians and fail to protect the natural resources on which they depend. The operation of the food systems creates ‘collateral damage’ to the natural environment including biodiversity loss. In coming decades, Australia’s food supply systems will be increasingly challenged by resource price inflation and climate change. Australia exports more than half of its current agricultural production. Government and business are aiming to substantially increase production to bolster exports. This will increase pressure on agricultural resources and exacerbate ‘collateral’ damage to the environment. The Australian public have a deep and ongoing interest in a very wide range of issues associated with the food systems including the environment, health and sustainability. Food is something we require in order to live and a good diet is something we have to have to be healthy. For health over a life-time we need food security. However, we also require a range of other material goods and social arrangements in order to develop and flourish as human beings. And we need these other things to be secure over a life-time. Food is therefore one security among a range of other securities we need in order to flourish. The paper outlines a number of approaches, as examples, that help to identify what these other goods and arrangements might be. The approaches mentioned in this paper include human rights, national securities, human needs, authentic happiness, capabilities, sustainability and environmental ethics. The different approaches provide a way of evaluating the current situation and indicating a direction for change within the food systems that will address the problems. However, changing large systems such as those involved in food supply is difficult because inertias and vested interests make the current food supply systems resilient to change. The paper suggests that one of the first and ongoing tasks is to develop an understanding of the situation from a comprehensive social–ecological systems perspective. The paper also suggests that a practical leverage point for system change is restructuring the flow of information on the health, natural resources and biodiversity loss issues related to the food supply systems.     

Who can be morally obligated to be a vegetarian?

Kathryn Paxton George has recently argued that vegetarianism cannot be a moral obligation for most human beings, even if Tom Regan is correct in arguing that humans and certain nonhuman animals are equally inherently valuable. She holds that Regan's liberty principle permits humans to kill and eat innocent others who have a right to life, provided that doing so prevents humans from being made worse off. George maintains that obstaining from meat and dairy products would in fact make most humans worse off. I argue that Regan's liberty principle either contradicts his equal rights view or does not permit the slaughter of another for food. I show that a different view recognizing the moral rights of nonhumans but according them less value than normal adult humans, the unequal rights view, would permit such action if human survival or health depended upon it. However, it would also permit the slaughter of innocent humans in the same circumstances. Finally, I argue that current nutritional research does not support George's contention that most humans would suffer if they ceased eating other animals and their products.