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.

在整个时间和空间尺度上，生物活性在世界海洋中的分布在很大程度上是通过向地表水的养分通量控制的。这些营养素（在很大程度上是硝酸盐，磷酸盐，有机硅，减少的氮形式和铁）支持浮游植物的主要形成有机物的主要形成，而浮游植物又构成了整个海洋食品网的基础。因此，这些营养物质的速度从根本上限制了生物产生的速度。在稳态的假设下，无机养分的净供应通过溶解或特定形式的有机物损失来平衡。该出口称为“新生产”；它导致表面和深海之间的碳重新分布，并且以复杂的方式可以影响大气与海洋之间的碳交换。因此，养分供应速率具有气候的影响。同样，在沿海地区，陆地来源的大量养分供应可能导致所谓的富营养化。由于这种养分输入，这表现在藻类过度和氧气的耗竭中。这些藻类越来越多地有毒，毒素在贝类中的积累是人类健康危害。由于上述原因，对海水中无机养分浓度的准确测量是海洋学研究的广泛横截面的基础。   我们要求资金购买可以满足这些目标的自动营养分析仪。该设备采用流量分段的方法，并通常测量硝酸盐，硅酮，磷酸盐​​和铵的浓度。该请求是要替换我们目前拥有的单元，该单元已有30年的历史（比我们所有的研究生，技术人员和PDF！）替换，并且不再起作用。结果将是我们处理目前正在研究的大量样品，全球沿海海洋研究中正在采集的大量样品的能力，以及对加拿大沿海胚胎的物理和生物学动态的深入研究。