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非损伤微测Zn2+选择性微电极的研发及应用
张云超1, 李连祯2, 徐世艾1, 于顺洋2, 李瑞杰2, 骆永明3
1.烟台大学化学化工学院;2.中国科学院烟台海岸带研究所;3.中国科学院南京土壤研究所
摘要:
非损伤微测技术(Non-invasive Micro-test Technology, NMT)是一种通过微电极实时测定进出活体材料离子和小分子流速的技术,已广泛应用于植物的生长发育和逆境胁迫等研究领域中。目前该技术专用的重金属微电极种类非常少,因此其在重金属胁迫研究中的应用也受到了限制。本文在前期工作的基础上开发了一种基于非损伤微测技术的Zn2+选择性微电极,首次实现了活体条件下植物根际Zn2+ 离子流的实时、动态检测。研发的微电极在去离子水中对Zn2+的线性响应范围为10-6-10-1 mol/L,能斯特斜率为30.2 mV/decade(浓度每增加或减少10倍电位值的变化),响应时间t95%≤1 s,正常工作pH范围为3.5-7.0;在简易模拟土壤溶液(0.1 mmol/L Ca(NO3)2、0.1 mmol/L KNO3、0.1 mmol/L Mg(NO3)2和1 mmol/L NaNO3)中,其线性响应范围变为5×10-5-10-1 mol/L,能斯特斜率为28.1 mV/decade,对土壤溶液中的共存阳离子具有较好的抗干扰性。利用构建的非损伤微测Zn2+选择性微电极对Zn/Cd超积累植物伴矿景天(Sedum plumbizincicola)根际不同微区的Zn2+离子流进行了实时检测。该技术的成功研发为活体条件下深入认识Zn2+在植物根际的微界面过程与机制提供了一种强有力的研究手段。
关键词:  锌离子  非损伤微测技术  离子选择性微电极  伴矿景天
DOI:
分类号:X53; O657.15
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),
Development and Application of Zn2+ Selective Microelectrode for Non-invasive Micro-test Technology
zhangyunchao1, lilianzhen2, xushiai1, yushunyang2, liruijie2, luoyongming3
1.College of Chemistry and Chemical Engineering,Yantai University;2.Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences;3.Institute of Soil Science, Chinese Academy of Sciences
Abstract:
Non-invasive Micro-test Technology (NMT) has been widely applied in the study of plant roots growth and development as well as the response of plant cell and tissue to abiotic stresses. Due to the limitations of its microelectrodes types for different metals, its application in the study of toxicological effects of heavy metals in plant is also limited. Based on our previous work, a NMT Zn2+ selective microelectrode was constructed and for the first time it was used for real-time monitoring Zn2+ ion flux at plant rhizosphere under living condition. The developed microelectrode had a Nernstian response (30.1 mV/decade of Zn2+ activity) to Zn2+ within the concentration range of 10-6 to 10-1 mol/L in DI water. The response time of the microelectrode is less than or equal to 1 s and the microelectrode can work well within a wide pH range of 3.5-7.0. While in simple simulated soil solution (containing 0.1 mmol/L Ca(NO3)2, 0.1 mmol/L KNO3, 0.1 mmol/L Mg(NO3)2 and 0.1 mmol/L NaNO3), it displayed a Nernstian response within Zn2+ concentration range of 5.0×10-5-10-1 mol/L with slope of 28.1 mV/decade. This indicated that the microelectrode has good anti-interference performance to the coexisting cations in soil solution. The developed Zn2+ selective microelectrode was then used to monitor the Zn2+ ion flux at the rhizosphere of Zn/Cd hyperaccumulator Sedum plumbizincicola. This developed technique provides a powerful method for understanding the process and mechanism of Zn2+ at the micro-interface of plant rhizosphere under living conditions.
Key words:  Zinc ion  Non-invasive Micro-test Technology  Ion selective microelectrode  Sedum plumbizincicola

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