Collaborative Research: Exploring the role of exogenous polyphosphate in the precipitation of calcium phosphate minerals in the marine environment

合作研究：探索外源聚磷酸盐在海洋环境中磷酸钙矿物质沉淀中的作用

• 批准号: 1559087
• 负责人: Yuanzhi Tang
• 金额: $ 35.97万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-02-01 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1559087&HistoricalAwards=false
• 关键词: Collaborative; Research; Exploring; role; exogenous

Phosphorous is an important nutrient sustaining all forms of life. In particular, in the ocean, phosphorous is a key limiting nutrient, controlling levels of primary productivity across large swaths of the ocean. Removal of phosphorous occurs largely via formation of stable apatite minerals in ocean sediments. However, average ocean conditions generally inhibit the formation of apatite, thus the abundance of apatite minerals in marine sediments is a mystery. This research aims to determine the mechanisms of apatite formation in the ocean to answer this century-old question. Evaluating these mechanisms will greatly advance current understanding of phosphorous cycling in the ocean. A more detailed understanding of phosphorous cycling can be applied across the disciplines of ocean science, and because of the importance of phosphorous as a nutrient and an element with a variety of interactions with other elements, it will be applicable to a variety of other research questions. The researchers are dedicated to promoting diversity in ocean science and plan to include undergraduate students from underrepresented groups in the study. They will also mentor a postdoc and communicate their science to the public and K-12 teachers via a blog entitled ?Britannica Blog?, the Atlanta Science Festival, a rock show, and educational material, the latter two to be developed as part of this work. Marine phosphorous burial via authigenic stable apatite formation in sediments is a major pathway for phosphorous removal in the ocean. However, in most marine environments, under natural conditions, this process is kinetically inhibited. It has been a mystery for more than a century as to how it is therefore possible for apatite to be oversaturated in large areas of marine sediments. A possible mechanism that could explain 95% of the apatite burial flux is that apatite minerals are precipitated as fine-grained particles from exogenous polyphosphate intermediates. Exogenous polyphosphates have been understudied, despite this possible importance as a mechanism for phosphorous removal. As a consequence this research could revolutionize current understanding of phosphorous cycling in the ocean for the major aim is to make a thorough and detailed study of the mechanisms behind marine apatite formation, focusing on the role of exogenous polyphosphate particles. Phosphorous is an element with widespread importance in ocean sciences, and more clearly understanding its burial will have applications across the disciplines.

磷是维持所有生命形式的重要营养素。特别是在海洋中，磷是一种关键的限制性营养素，控制着大片海洋的初级生产力水平。磷的去除主要是通过在海洋沉积物中形成稳定的磷灰石矿物来进行的。然而，平均海洋条件通常抑制磷灰石的形成，因此海洋沉积物中磷灰石矿物的丰度是一个谜。这项研究旨在确定海洋中磷灰石形成的机制，以回答这个百年问题。评估这些机制将大大推进目前对海洋中磷循环的理解。对磷循环的更详细了解可以应用于海洋科学的各个学科，由于磷作为一种营养素和一种与其他元素有各种相互作用的元素的重要性，它将适用于各种其他研究问题。研究人员致力于促进海洋科学的多样性，并计划将来自代表性不足群体的本科生纳入研究。他们还将指导博士后，并通过一个名为？大英百科全书博客？，亚特兰大科学节、摇滚表演和教育材料，后两者将作为这项工作的一部分开发。 沉积物中自生稳定磷灰石的形成是海洋磷去除的主要途径。然而，在大多数海洋环境中，在自然条件下，这一过程在动力学上受到抑制。世纪以来，磷灰石如何在大面积的海洋沉积物中过饱和一直是个谜。一个可能的机制，可以解释95%的磷灰石埋藏通量是，磷灰石矿物沉淀为细粒颗粒从外源聚磷酸盐中间体。外源性多聚磷酸盐一直研究不足，尽管这可能是一种重要的除磷机制。因此，这项研究可能会彻底改变目前对海洋中磷循环的理解，因为主要目的是对海洋磷灰石形成背后的机制进行深入和详细的研究，重点是外源聚磷酸盐颗粒的作用。磷是海洋科学中具有广泛重要性的元素，更清楚地了解其埋藏将在各个学科中应用。

项目成果

Manganese Oxide Catalyzed Hydrolysis of Polyphosphates

• DOI: 10.1021/acsearthspacechem.9b00220
• 发表时间: 2019-10
• 期刊: ACS Earth and Space Chemistry
• 影响因子: 3.4
• 作者: B. Wan;Rixiang Huang;J. Diaz;Yuanzhi Tang

Phosphate removal using aluminum-doped magnetic nanoparticles

• DOI: 10.5004/dwt.2017.0356
• 发表时间: 2017-01-01
• 期刊: DESALINATION AND WATER TREATMENT
• 影响因子: 1.1
• 作者: Xu, Jie;Luu, Letitia;Tang, Yuanzhi
• 通讯作者: Tang, Yuanzhi