The forgotten variable: Impact of cleaning on the skeletal composition of a marine invertebrate
The forgotten variable: Impact of cleaning on the skeletal composition of a marine invertebrate
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被遗忘的变量：清洁对海洋无脊椎动物骨骼组成的影响
DOI：
10.1016/j.chemgeo.2017.10.022
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发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Loxton J
中科院分区：
文献类型：
--
作者：
Loxton J
几个世纪以来，无脊椎动物收藏品一直受到各种收集后和策展清洁技术的影响。然而，清洗可能会损坏甚至溶解骨骼碳酸钙，从而影响随后的任何地球化学分析。我们研究了三种清洗变量：水（去离子水和自来水）、漂白剂（10%和78%）和超声波（所有清洗时间都在一定范围内）对海洋苔藓虫ofFlustra foliacea（Linnaeus, 1758）骨架的综合影响。清洗前后分析处理过的和对照的碳酸盐，测量：MgCO3in方解石（x射线衍射和染色）；有机碳：无机碳的比例，用元素分析总碳的燃烧和有机碳的酸溶解和燃烧。使用电感耦合等离子体原子发射光谱（ICP-AES）分析处理溶液，以检测可能浸出的任何Ca2 +和Mg2 +。漂白剂浓度为10%或更高时，方解石中mgco3的减重和去除效果明显更好，特别是在较长时间的处理和使用超声波的情况下。具有较高初始MgCO3in方解石的样品特别容易被Mg浸出。我们认为苔藓虫骨架mgco3与清洗溶液的相互作用是由溶液化学和反应动力学共同控制的，在进行地球化学分析之前，清洗样品越少越好。
For centuries, invertebrate collections have been subjected to various post-collection and curatorial cleaning techniques. Cleaning, however, may damage or even dissolve skeletal calcium carbonate and consequently influence any subsequent geochemical analysis. We investigated the combined effects of three cleaning variables: water (deionized and tap water), bleach (10% and 78%) and ultrasound (all for a range of durations), on the skeleton ofFlustra foliacea(Linnaeus, 1758), a marine bryozoan. Treated and control carbonates were analysed both before and after cleaning, measuring: MgCO3in calcite (X-ray diffractometry and staining); organic:inorganic carbon ratio, using elemental analysis for total carbon by combustion and for organic carbon by acid dissolution and combustion. Treatment solutions were analysed using inductively coupled plasma atomic emission spectroscopy (ICP-AES) to detect any Ca2 +and Mg2 +that may have leached out. Significantly more weight loss and removal of MgCO3from calcite occurred in bleach concentrations of 10% or higher, especially in longer duration treatments and with use of ultrasound. Specimens with higher initial MgCO3in calcite were especially susceptible to Mg leaching. We suggest that the interaction between bryozoan skeletal MgCO3and cleaning solutions is controlled by a combination of solution chemistry and reaction kinetics, and that when cleaning specimens prior to geochemical analysis, less is better.