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首页> 外文期刊>Environmental Science & Technology >An Optical Dye Method for Continuous Determination of Acidity in Ice Cores
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An Optical Dye Method for Continuous Determination of Acidity in Ice Cores

机译：光学染料法连续测定冰芯中的酸度

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摘要

The pH of polar ice is important for the stability and mobility of impurities in ice cores and can be strongly influenced by volcanic eruptions or anthropogenic emissions. We present a simple optical method for continuous determination of acidity in ice cores based on spectroscopically determined color changes of two common pH-indicator dyes, bromophenol blue, and chlorophenol red. The sealed-system method described here is not equilibrated with CO_2, making it simpler than existing methods for pH determination in ice cores and offering a 10-90% peak response time of 45 s and a combined uncertainty of 9%. The method is applied to Holocene ice core sections from Greenland and Antarctica and compared to standard techniques such as electrical conductivity measurement (ECM) conducted on the solid ice, and electrolytic meltwater conductivity, EMWC- Acidity measured in the Greenland NGRIP ice core shows good agreement with acidity calculated from ion chromatography. Conductivity and dye-based acidity H_(dye)~+ are found to be highly correlated in the Greenland NEGIS firn core (75.38° N, 35.56° W), with all signals greater than 3σ variability coinciding with either volcanic eruptions or possible wild fire activity. In contrast, the Antarctic Roosevelt Island ice core (79.36° S, 161.71° W) features an anticorrelation between conductivity and H_(dye)~+, likely due to strong influence of marine salts.
机译：极性冰的pH值对于冰芯中杂质的稳定性和迁移性很重要，并且会受到火山喷发或人为排放的强烈影响。我们提出了一种简单的光学方法，用于根据光谱确定的两种常见pH指示剂染料（溴酚蓝和氯酚红）的颜色变化，连续测定冰芯中的酸度。这里描述的密封系统方法无法与CO_2相平衡，因此比现有的冰芯pH值测定方法更简单，并且峰响应时间为10s-90％，为45 s，不确定度为9％。该方法适用于格陵兰和南极洲全新世的冰芯部分，并与标准技术进行了比较，例如对固体冰进行电导率测量（ECM）和电解熔体水电导率，在格陵兰NGRIP冰芯中测得的EMWC-酸度显示出良好的一致性由离子色谱法计算出的酸度。发现电导率和染料基酸度H_（dye）〜+在格陵兰岛NEGIS岩心（75.38°N，35.56°W）中高度相关，所有大于3σ变异性的信号都与火山喷发或可能的野火相吻合活动。相比之下，南极罗斯福岛冰芯（79.36°S，161.71°W）在电导率和H_（dye）〜+之间具有反相关性，这可能是由于海盐的强烈影响。

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  • 来源
    《Environmental Science & Technology》 |2016年第19期|10485-10493|共9页
  • 作者

    Helle Astrid Kjaer; Paul Vallelonga; Anders Svensson; Magnus Elleskov L. Kristensen; Catalin Tibuleac; Mai Winstrup; Sepp Kipfstuhl;

  • 作者单位

    Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark;

    Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark;

    Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark;

    Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark;

    Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark;

    Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark;

    Alfred Wegener Institute, Bremerhaven, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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