Institute of Water Chemistry, Technische Universität Dresden, 01069 Dresden, Germany.
Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, 50-375 Wrocław, Poland.
Int J Environ Res Public Health. 2018 Oct 23;15(11):2335. doi: 10.3390/ijerph15112335.
Dissolved organic carbon (DOC) is a sum parameter that is frequently used in water analytics. Highly resolved and accurate DOC data are necessary, for instance, for water quality monitoring and for the evaluation of the efficiency of treatment processes. The conventional DOC determination methods consist of on-site sampling and subsequent analysis in a stationary device in a laboratory. However, especially in regions where no or only poorly equipped laboratories are available, this method bears the risk of getting erroneous results. For this reason, the objective of the present study was to set up a reliable and portable DOC analyzer for on-site analysis. The presented DOC system is equipped with an electrolysis-based decomposition cell with boron-doped diamond electrodes (BDD) that oxidizes the organic compounds to carbon dioxide. Within this study, the influence of different electrode materials and the composition of the applied electrolytes on the DOC decomposition in an undivided electrolytic cell were systematically investigated. Furthermore, some technical aspects of the portable prototype are discussed. After a detailed validation, the prototype was used in an ongoing monitoring program in Northern India. The limit of detection is 0.1 mg L C with a relative standard deviation of 2.3% in a linear range up to 1000 mg L C. The key features of the portable DOC analyzer are: No need for ultra-pure gases, catalysts or burning technology, an analyzing time per sample below 5 min, and a reliable on-site DOC determination.
溶解有机碳 (DOC) 是水质分析中常用的综合参数。需要高度精确和准确的 DOC 数据，例如用于水质监测和处理工艺效率评估。传统的 DOC 测定方法包括现场采样和随后在实验室的固定设备中进行分析。然而，特别是在没有或只有设备简陋的实验室的地区，这种方法存在得出错误结果的风险。出于这个原因，本研究的目的是为现场分析建立一种可靠的便携式 DOC 分析仪。所提出的 DOC 系统配备有电解析出池，其使用掺硼金刚石电极 (BDD) 氧化有机化合物为二氧化碳。在本研究中，系统地研究了不同电极材料和应用电解液组成对非分隔电解池中 DOC 分解的影响。此外，还讨论了便携式原型机的一些技术方面。在详细验证后，该原型机被用于印度北部正在进行的监测计划中。检测限为 0.1 mg L C，在 0.1 至 1000 mg L C 的线性范围内相对标准偏差为 2.3%。便携式 DOC 分析仪的主要特点是：无需使用超纯气体、催化剂或燃烧技术，每个样品的分析时间低于 5 分钟，以及可靠的现场 DOC 测定。
