Agustsson Jon, Akermann Oliver, Barry D Andrew, Rossi Luca
Ecological Engineering Laboratory, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Environ Sci Process Impacts. 2014 Aug;16(8):1897-902. doi: 10.1039/c3em00707c.
Water contamination is an important environmental concern underlining the need for reliable real-time information on contaminant concentrations in natural waters. Here, a new non-contact UV-Vis spectroscopic approach for monitoring contaminants in water, and especially wastewater, is proposed. Diffuse reflectance UV-Vis spectroscopy was applied to measure simultaneously the chemical oxygen demand (COD) and turbidity (TUR) concentrations in water. The measurements were carried out in the wavelength range from 200-1100 nm. The measured spectra were analysed using partial-least-squares (PLS) regression. The correlation coefficient between the measured and the reference concentrations of COD and TUR in the water samples were R(2) = 0.85 and 0.96, respectively. These results highlight the potential of non-contact UV-Vis spectroscopy for the assessment of water contamination. A system built on the concept would be able to monitor wastewater pollution continuously, without the need for laborious sample collection and subsequent laboratory analysis. Furthermore, since no parts of the system are in contact with the wastewater stream the need for maintenance is minimised.
水污染是一个重要的环境问题，这凸显了获取天然水体中污染物浓度可靠实时信息的必要性。在此，提出了一种用于监测水中尤其是废水中污染物的新型非接触紫外-可见光谱方法。漫反射紫外-可见光谱法被用于同时测量水中的化学需氧量（COD）和浊度（TUR）浓度。测量在200 - 1100 nm的波长范围内进行。使用偏最小二乘法（PLS）回归分析测量光谱。水样中COD和TUR的测量浓度与参考浓度之间的相关系数分别为R(2) = 0.85和0.96。这些结果突出了非接触紫外-可见光谱法在评估水污染方面的潜力。基于该概念构建的系统将能够连续监测废水污染，无需费力地采集样品和随后进行实验室分析。此外，由于系统没有任何部件与废水流接触，维护需求被降至最低。
