Nutrient autoanalyzer

营养成分自动分析仪

• 批准号: 341299-2007
• 负责人: Lewis, Marlon
• 金额: $ 6.91万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=325737
• 关键词: Nutrient; autoanalyzer

Distributions of biological activity in the world's oceans over a range of time and space scales are controlled, in large part, by the flux of nutrients to the surface waters. These nutrients (largely nitrate, phosphate, silicate, reduced nitrogen forms, and iron) support the primary formation of organic matter by the phytoplankton, which in turn form the base of the entire marine food web. The rate at which these nutrients are supplied to the upper ocean therefore fundamentally constrains the rate of biological production. Under an assumption of steady-state, the net supply of inorganic nutrients is balanced by losses of organic matter, in either dissolved or particulate form. This export is referred to as "new production"; it results in a redistribution of carbon between the surface and deep ocean, and in a complex fashion, can also influence the exchange of carbon between atmosphere and ocean. The rate of nutrient supply therefore has climate implications. As well, in the coastal region, abundant supply of nutrients from terrestrial sources can result in what is termed eutrophication. This is manifested in an overabundance of algae and a depletion of oxygen as a consequence of this nutrient input; increasingly often, these algae are toxic and the accumulation of toxins in shellfish is a human health hazard. For the reasons above, the accurate and precise measurement of the concentration of inorganic  nutrients in seawater is fundamental to a broad cross-section of oceanographic study.      We request funds to purchase an automated nutrient analyzer which can meet these objectives. The device takes a flow-segmented  approach,and routinely measures the concentrations of nitrate, silicate,phosphate and ammonium. The request is to replace a unit that we currently have which is >30 years old (older than all of our graduate students, techs, and pdf's!), and which no longer functions. The result will be a large step in our ability to handle the large number of samples that are currently being taken in our studies of the open ocean, coastal oceans on a global basis, and   intensive studies of the physical and biological dynamics of Canadian coastal embayments.

世界各海洋生物活动在不同时间和空间尺度上的分布，在很大程度上受流向表层沃茨的营养物质的控制。这些营养物质（主要是硝酸盐，磷酸盐，硅酸盐，还原氮形式和铁）支持浮游植物有机物质的初级形成，而浮游植物又形成了整个海洋食物网的基础。因此，这些营养物质供应到上层海洋的速度从根本上限制了生物生产的速度。在稳定状态的假设下，无机营养素的净供应被溶解或颗粒形式的有机物质的损失所平衡。这种输出被称为“新生产”;它导致碳在表层和深海之间的重新分配，并以复杂的方式影响大气和海洋之间的碳交换。因此，养分供应的速度具有气候影响。同样，在沿海地区，来自陆地来源的大量营养物质可导致所谓的富营养化。这表现在藻类过多和这种营养物质输入造成的氧气耗尽;这些藻类越来越多地有毒，贝类毒素的积累对人类健康构成危害。由于上述原因，海水中无机营养盐浓度的准确和精确测量对于广泛的海洋学研究至关重要。 我们要求提供资金，以购买一台能够满足这些目标的自动营养分析仪。该设备采用流动分段方法，并定期测量硝酸盐，硅酸盐，磷酸盐和铵的浓度。要求是更换一个单位，我们目前有这是>30岁（比我们所有的研究生，技术人员，和pdf的！），而它已经不起作用了其结果将是一个很大的进步，我们有能力处理大量的样本，目前正在采取我们的研究开放的海洋，沿海海洋在全球范围内， 加拿大沿海海湾的物理和生物动力学的深入研究。