Continuous multiple measurement of soil redox potential using platinum microelectrodes
Continuous multiple measurement of soil redox potential using platinum microelectrodes
复制标题
使用铂微电极连续多次测量土壤氧化还原电位
DOI：
10.2136/sssaj2002.1813
复制
发表时间：
2002
影响因子：
2.9
通讯作者：
G. Thériault
中科院分区：
文献类型：
--
作者：
E. Bochove;S. Beauchemin;G. Thériault
氧化还原电位（E H）测量是插入土壤或各种基质中的工作电极（例如Pt电极）和参比电极之间的电压差的阅读。进行这项研究，以开发一种方法，连续，自主，和多个E H测量使用Pt微电极连接到数据记录器。进行了初步的现场实验，以评估在原位安装的铂微电极的长期可行性。在实验室中进行的第二个实验，以测试设计，以允许稳定的E H测量的接口。Pt微电极和参比电极在现场试验期间显示出可靠的读数，并且在四个月的实验结束时通常测试为可行的。然而，记录的E H测量值和手动稳定的读数之间的差异，特别是在中等还原条件下，强调了调整手动稳定读数的原则，以使用数据记录仪的必要性。从连接到一个新的自制接口的Pt微电极和参比电极对获得的实验室数据证实，瞬时记录测量导致低估的E H值由140 mV的临界和不稳定的范围0至200 mV。使用Pt微电极的稳定E H的连续，多次测量现在是可行的，使用放置在微电极和数据记录器之间的稳定接口。
Redox potential (E H ) measurement is a reading of voltage difference between a working electrode such as a Pt electrode and a reference electrode inserted into the soil or various substrates. This study was conducted to develop a method for continuous, autonomous, and multiple E H measurements using Pt microelectrodes connected to a data logger. A preliminary field experiment was carried out to assess the long-term viability of Pt microelectrodes installed in situ. A second experiment was conducted in the laboratory to test an interface designed to allow the stabilization of E H measurements. The Pt microelectrodes and reference electrode showed reliable readings during the field trial and generally tested viable at the end of the four month experiment. However, discrepancies between logged E H measurements and manually stabilized readings, particularly under moderate reductive conditions, emphasized the necessity to adapt the principle of manually stabilized readings to the use of a data logger. Laboratory data obtained from pairs of Pt microelectrodes and reference electrodes connected to a new homemade interface confirmed that instantaneous logged measurements led to the underestimation of E H values by 140 mV in the critical and unstable range of 0 to 200 mV. Continuous, multiple measurements of stabilized E H using Pt microelectrodes is now feasible using a stabilization interface placed between the microelectrode and the data logger.