Department of Environmental Engineering, Konkuk University, Seoul, 143-701, 05029, Republic of Korea.
J Environ Manage. 2022 Jun 15;312:114893. doi: 10.1016/j.jenvman.2022.114893. Epub 2022 Mar 18.
Dissolved CO originating from underground structures at high concentrations may pose a threat to public and environmental health. Therefore, a convenient monitoring technique that allows fast detection of dissolved CO needs to be developed. In this study, a low-cost colorimetric CO sensor was applied for monitoring dissolved CO. The sensor is composed of an acrylic reactor, cresol red pH indicator solution, and a gas-permeable membrane, and the performance of the sensor was tested for the detection of dissolved CO at the range of 2-800 mg CO L. Color change of the detection solution within the sensor was mainly dependent on CO dissolved in the water sample. This was analyzed using an RGB program that extracts the red, green, and blue intensity of a target color on a scale of 0-255. ΔGB, an index of CO concentration corresponding to the change in intensity of green (G) and blue (B) extracted by the RGB program, exhibited a linear relationship with dissolved CO concentrations (r > 0.95, p < 0.005). In the field, the sensor was able to measure dissolved CO between 10 and 411 mg CO L within 1 min. Overall, our CO sensor has high potential to be used in detection of dissolved CO in groundwater and surface waters.
来源于地下结构的高浓度溶解 CO 可能对公众和环境健康构成威胁。因此，需要开发一种方便的监测技术，以便快速检测溶解 CO。在这项研究中，应用了一种低成本的比色 CO 传感器来监测溶解 CO。该传感器由一个丙烯酸反应器、甲酚红 pH 指示剂溶液和透气膜组成，用于检测 2-800mg CO L 范围内的溶解 CO。传感器内检测溶液的颜色变化主要取决于水样中溶解的 CO。这是通过一个 RGB 程序进行分析的，该程序可在 0-255 的范围内提取目标颜色的红、绿、蓝强度。RGB 程序提取的绿色 (G) 和蓝色 (B) 强度变化对应的 CO 浓度指标 ΔGB 与溶解 CO 浓度呈线性关系 (r>0.95，p<0.005)。在现场，传感器能够在 1 分钟内测量 10 至 411mg CO L 之间的溶解 CO。总的来说，我们的 CO 传感器在检测地下水和地表水的溶解 CO 方面具有很大的潜力。
