High resolution coral Cd measurements using LA-ICP-MS and ID-ICP-MS: Calibration and interpretation
High resolution coral Cd measurements using LA-ICP-MS and ID-ICP-MS: Calibration and interpretation
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DOI：
10.1016/j.chemgeo.2013.08.024
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发表时间：
2013-10
期刊：
影响因子：
3.9
通讯作者：
A. Grottoli;K. Matthews;James E. Palardy;W. McDonough
中科院分区：
文献类型：
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作者：
A. Grottoli;K. Matthews;James E. Palardy;W. McDonough
珊瑚骨骼中的镉（Cd）浓度跟踪海洋上涌，这将富含镉的深水带到表面。在这项研究中，我们报告的[镉]coralmeasured通过激光烧蚀电感耦合等离子体质谱法（LA-ICP-MS）在三种珊瑚（Poriteslobata，Pavonagigantea，和Pavona clavus）从巴拿马湾的上升流网站每月测量。虽然在所有物种的单一LA轨道产生了可变的结果，多个轨道的平均值反映了在原位海水镉（[Cd]SW）的变化，峰值之间的偏移。此外，还比较了同位素稀释（ID）-ICP-MS和LA-ICP-MS测定珊瑚中[Cd]的差异。clavusand发现高度相关，尽管使用ID方法测量的浓度始终较低。两个5.5个月长的高分辨率P. clavus[Cd]珊瑚记录显示，最大[Cd]珊瑚值发生在海表温度最低值之后，与海水磷酸盐浓度和珊瑚P/Ca最大值同时，大约在[Cd] SW峰值之前一个月。基于这些发现，我们假设珊瑚正在积极吸收Cd并将其纳入骨骼，一旦镉不再通过生物过程从水体中迅速去除，[Cd] swf就会增加。在考虑了珊瑚和海水[Cd]最大值之间1个月的偏移后，LA和ID衍生的[Cd]coralvalues与[Cd]sw显著相关，为[Cd] sw替代品提供了校准。鸡眼三年高分辨率P。clavusLA-[Cd]珊瑚记录显示了[Cd]珊瑚产生高分辨率[Cd]swrecord的潜力。然而，由于高分辨率LA-ICPMS [Cd]珊瑚值的自然变异性内和珊瑚群之间，三个激光跟踪每个殖民地和至少三个殖民地的P。clavus需要进行分析，以产生可靠的珊瑚[Cd]珊瑚记录。
Cadmium (Cd) concentrations in coral skeleton track oceanic upwelling, which brings Cd-rich deep water to the surface. In this study we report sub-monthly measurements of [Cd]coralmeasured via laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) in three species of coral (Poriteslobata,Pavonagigantea, andPavona clavus) from an upwelling site in the Gulf of Panama. Although single LA tracks in all species yielded variable results, the average of multiple tracks mirrored changes in in situ seawater Cd ([Cd]sw), with an offset between peaks. In addition, [Cd]coraldetermined by LA-ICP-MS and isotope dilution (ID)-ICP-MS was compared inP. clavusand found to be highly correlated, despite consistently lower concentrations measured using the ID method. Two 5.5-month long high-resolutionP. clavus[Cd]coralrecords revealed that the maximum [Cd]coralvalues occurred after the sea surface temperature minimum, at the same time as the seawater phosphate concentration and coral P/Ca maximum, and approximately one month before peak [Cd]sw. Based on these findings we hypothesize that corals are actively taking up Cd and incorporating it into their skeleton, and that [Cd]swonly increases once Cd is no longer being rapidly removed from the water column via biological processes. After accounting for a 1-month offset between the coral and seawater [Cd] maxima, both LA- and ID-derived [Cd]coralvalues were significantly correlated to [Cd]sw, providing a calibration for this [Cd]swproxy inP. clavus. A three year high-resolutionP. clavusLA-[Cd]coralrecord demonstrated the potential of [Cd]coralto generate a high-resolution [Cd]swrecord. However, due to the natural variability in high-resolution LA-ICPMS [Cd]coralvalues within and among coral colonies, three laser tracks per colony and at least three colonies ofP. clavusneed to be analyzed to produce a reliable coral [Cd]coralrecord.