The effect of extraction techniques on calcium concentrations and isotope ratios of marine pore water
The effect of extraction techniques on calcium concentrations and isotope ratios of marine pore water
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提取技术对海洋孔隙水钙浓度和同位素比的影响
DOI：
10.1080/10256016.2019.1702038
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发表时间：
2019
影响因子：
1.3
通讯作者：
Teichert
中科院分区：
文献类型：
--
作者：
Wittke;Gussone;Teichert
比较两种不同的技术应用于提取海洋孔隙水样品的沉积物，完善的全轮（WR）的方法和最近的Rhizon的方法，在其提取的孔隙沃茨中的稳定钙同位素比值的影响方面，我们认识到两种采样方法之间的系统偏移。对于Rhizon采样技术，较高的δ44/40 Ca值与较低的Ca浓度相关，而对于相应的WR衍生孔隙水样品，较低的δ44/40 Ca值与较高的Ca浓度相关。涉及Rayleigh分馏和混合计算的模型表明，观察到的偏移很可能是由Rhizon采样诱导的CO2脱气过程中发生的CaCO 3沉淀和离子交换的组合过程引起的。在WR加压过程中，改变压力、萃取时间或萃取率均不会引起δ44/40 Ca的变化，表明在孔隙水取样过程中没有发生Ca同位素分馏。根据分析和模拟结果，WR样品似乎提供了更能代表“真实”孔隙水同位素组成的δ44/40 Ca值。虽然采样技术之间的差异接近于当今钙同位素分析的分析精度，但随着未来分析精度的提高，这种差异可能会变得更加相关。
Comparing two different techniques applied for the extraction of marine pore water samples from sediments, the well-established whole round (WR) method and the more recent Rhizon method, in terms of their effects on stable calcium isotope ratios in extracted pore waters, we recognize a systematic offset between the two sampling methods. Higher δ44/40Ca values are associated with lower Ca concentrations for the Rhizon sampling technique and lower δ44/40Ca values are associated with higher Ca concentrations for the corresponding WR-derived pore water samples. Models involving Rayleigh fractionation and mixing calculation suggest that the observed offset is most likely caused by a combined process of CaCO3precipitation and ion exchange taking place during Rhizon sampling-induced CO2degassing. Changing pressure, extraction time or extraction yield during WR pressing does not lead to a variation in δ44/40Ca, indicating that no Ca isotope fractionation takes place during the sampling of pore water. On the basis of analytical and modelling results, WR samples appear to provide δ44/40Ca values that are more representative of the ‘true’ pore water isotopic composition. While the difference between the sampling techniques is close to the present-day analytical precision of Ca isotope analysis, it may become more relevant with increasing analytical precision in the future.
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影响因子：
8.9
作者：
B. Knight;A. Chaudri;S. McGrath;K. Giller
通讯作者：
B. Knight;A. Chaudri;S. McGrath;K. Giller
在沉积物中的海洋碳酸盐系统研究中比较 Rhizon 采样器和离心分离孔隙水
DOI：
10.1002/lom3.10286
发表时间：
2018
期刊：
Limnology and Oceanography: Methods
影响因子：
--
作者：
Z. Steiner;B. Lazar;J. Erez;A. Turchyn
通讯作者：
A. Turchyn
504B 孔、第 92 段的地球化学研究
DOI：
10.2973/dsdp.proc.92.136.1986
发表时间：
1986
期刊：
Calcium Stable Isotope Geochemistry
影响因子：
--
作者：
J. Gieskes;M. Kastner;J. Erzinger;J. Boulègue;S. Hart
通讯作者：
S. Hart
影响因子：
1.2
作者：
Gerald R. Dickens;Martin Koelling;David C. Smith;Lu�ie Schnieders
通讯作者：
Gerald R. Dickens;Martin Koelling;David C. Smith;Lu�ie Schnieders
一种简单、可靠且廉价的孔隙水采样器1
影响因子：
4.5
作者：
R. Jahnke
通讯作者：
R. Jahnke