ASSIGNMENT代写

邦德代写Assignment:污染

2017-02-15 13:02

等土壤污染有许多不同的来源,从垃圾填埋场渗漏,排放工业废水进入土壤,污染的水泄漏到土壤、地下储油罐泄漏,过度应用杀虫剂、除草剂、化肥和固体废物渗流[6]。然而,最常见的化学物质,导致土壤污染有:石油碳氢化合物、重金属、农药、有机溶剂、多环芳烃(多环芳烃)、多氯联苯(pcb)、氯代芳香族化合物,无机化合物,如硝酸盐、磷酸盐、无机酸和放射性物质[7]。土壤对人类是非常重要的资源,不仅因为它直接影响我们的农业,而且还因为它影响国内动物对我们的生存至关重要。正如人们预期的那样,好的土壤健康改善农作物的生产效率。根据定义,土壤健康土壤功能的能力是一种重要的生命系统,在一个生态系统和土地利用边界,维持生物生产力,促进空气和水环境的质量,并保持植物,动物,和人类健康[6 - 7]。 土壤的重要性进一步凸显了一个事实:土壤是环保过滤去除各种有毒物质[7]。同样值得指出,由于再生的土壤化学和生物过程需要很长时间,土壤被认为是一个非常宝贵的、不可再生的资源。相信一个组件的土壤最易受土壤污染的微生物存在于土壤.

邦德代写Assignment:污染

There are many different sources for soil pollution such as, seepage from a landfill, discharge of industrial waste into the soil, leakage of contaminated water into the soil, leakage of underground storage tanks, excess application of pesticides, herbicides or fertilizer and solid waste seepage [6]. However, the most common chemicals that cause soil pollution are: petroleum hydrocarbons, heavy metals, pesticides, organic solvents, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), chlorinated aromatic compounds, as well as inorganic compounds, such as nitrates, phosphates, inorganic acids and radioactive substances [7]. Soil is an extremely important resource for human beings, not only because it impacts our agriculture directly, but also since it affects domestic animals that are crucial to our survival. As would be expected, good soil health improves the productivity of agricultural crops. By definition, soil health is the capacity of soil to function as a vital living system, within an ecosystem and land use boundaries, to sustain biological productivity, promote the quality of air and water environment, and maintain plant, animal, and human health [6-7].The importance of soil is further highlighted by the fact that soil works as an environmental filter to remove various toxic substances [7]. It is also worth pointing out that since regeneration of soil by chemical and biological processes takes a very long time, soil is considered to be a very precious, non-renewable resource. it is believed that one components of soil that is most susceptible to soil pollution are the microorganisms that are present in soil 
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