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首页> 外文学位 >Determination of trace elements in marine suspended particulate material using inductively coupled plasma mass spectrometry.
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Determination of trace elements in marine suspended particulate material using inductively coupled plasma mass spectrometry.

机译：使用电感耦合等离子体质谱法测定海洋悬浮颗粒物质中的痕量元素。

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摘要

The importance of trace metals to primary productivity in the ocean, and the ability of plankton to decrease inorganic carbon concentrations in the ocean's surface thereby facilitating diffusion of CO2 into the ocean, is extremely important to investigate. Studies of trace metals in the ocean are complicated by generally low concentrations (typically picomolar to nanomolar), a high potential for contamination, and interactions between dissolved species and suspended particulate matter (SPM), which influence the distribution and concentration of trace elements. Research using inductively coupled plasma mass spectrometry combined with trace metal 'clean' techniques has introduced opportunities to advance our knowledge of the trace metal content of SPM. This research was focused on determining Al, P, S, Cr, Mn, Fe, Co, Ni, Cu, and Zn in planktonic material and SPM using ICP-MS. This was done by sampling the Equatorial Pacific. Water samples from this region were filtered and digested in order to be introduced into a Thermo Finnigan Element ICP-MS for determination of trace metals. The use of external standard curves versus standard addition curves for quantification was also examined. A cocktail of internal standards, In, Sc, Y, and Ge, were used to help correct for instrumental instability. It was found that instrumental LODs were below the concentrations of Equatorial Pacific samples. However, filter blanks constituted a non-negligible fraction of the SPM analytical signal for several elements, introducing uncertainty in quantification. External standard curves were found to be more precise and more applicable for studies using low volume samples. Determining the proper internal standard was difficult since there were a large number of elements and one internal standard will not have similar physical and chemical properties to all the elements investigated, but it was found that In or Sc worked the best for correcting for instrumental instability when examining a large suite of elements. Samples from the Equatorial Pacific were found to have similar metal to P (M:P) ratios compared to previous studies. The M:P ratios were 5.86, 0.89, and 1.12 mmol/mol for Fe/P, Mn/P and Ni/P respectively. The mean Fe (+/-SD) concentrations by station were 43.0+/-42.6, 59.8+/-29.4, 41.2+/-20.9, 46.2+/-16.3, and 59.0+/-23.4 pM for stations 4, 7, 10, 22, and 29. Cobalt mean concentrations were 7.2+/-2.1, 3.0+/-1.3, 2.6+/-1.8, 4.1+/-0.05, 2.5+/-2.6, and 3.4+/-2.7 pM for stations 2, 4, 7, 10, 22, and 29. The mean concentrations by station for Ni were 9.3+/-3.5, 7.0+/-3.3, 8.1+/-5.9, 3.7+/-3.8, 23.5+/-12.1, and 15.8+/-7.6 pM for stations 2, 4, 7, 10, 22, and 29.
机译：微量金属对海洋初级生产力的重要性以及浮游生物降低海洋表面无机碳浓度从而促进CO2向海洋扩散的能力至关重要。海洋中痕量金属的研究通常由于浓度低（通常为皮摩尔至纳摩尔），高污染可能性以及溶解物质与悬浮颗粒物（SPM）之间的相互作用而变得复杂，这会影响痕量元素的分布和浓度。使用电感耦合等离子体质谱法结合痕量金属“清洁”技术进行的研究为提高我们对SPM痕量金属含量的认识提供了机会。这项研究的重点是使用ICP-MS测定浮游物质和SPM中的Al，P，S，Cr，Mn，Fe，Co，Ni，Cu和Zn。这是通过对赤道太平洋采样来完成的。过滤并消化来自该区域的水样，然后将其引入Thermo Finnigan元素ICP-MS中，以测定痕量金属。还检查了使用外部标准曲线和标准添加曲线进行定量的情况。使用内部标准品In，Sc，Y和Ge的混合物来帮助校正仪器的不稳定性。发现仪器的检测限低于赤道太平洋样品的浓度。但是，滤色片空白对于某些元素而言是SPM分析信号不可忽略的一部分，从而在定量分析中带来了不确定性。发现外标曲线更精确，更适用于使用少量样品的研究。确定适当的内标是困难的，因为存在大量元素，并且一个内标不会具有与所研究的所有元素相似的物理和化学性质，但是发现In或Sc在校正仪器不稳定性时效果最佳。检查大量元素。与先前的研究相比，发现来自赤道太平洋的样品具有相似的金属与P（M：P）比。 Fe / P，Mn / P和Ni / P的M：P比分别为5.86、0.89和1.12 mmol / mol。站点4、7的站点平均Fe（+/- SD）浓度为43.0 +/- 42.6、59.8 +/- 29.4、41.2 +/- 20.9、46.2 +/- 16.3和59.0 +/- 23.4 pM。 10、22和29。工作站的钴平均浓度为7.2 +/- 2.1、3.0 +/- 1.3、2.6 +/- 1.8、4.1 +/- 0.05、2.5 +/- 2.6和3.4 +/- 2.7 pM 2、4、7、10、22和29。Ni的平均站浓度分别为9.3 +/- 3.5、7.0 +/- 3.3、8.1 +/- 5.9、3.7 +/- 3.8、23.5 +/- 12.1 ，以及工作站2、4、7、10、22和29的15.8 +/- 7.6 pM。

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