• Energy Research

Life cycle assessment (LCA) is a powerful tool to quantify the environmental burdens of different analytical techniques. This work assesses the environmental impacts associated with the use of a simple electrochemical carbon paper sensor (CPS) for ketoprofen detection in fish by LCA in comparison with traditional liquid high-performance chromatography (HPLC) with fluorescent detection. The results indicate significant advantages of CPS compared to HPLC in 16 of the 18 analyzed categories of impact (ReCiPe2016(H) method), with average CPS values 26% lower than for HPLC. This is due, in the categories of impact with higher environmental relevance, to the higher electric energy consumption during the “Analysis” step and, secondarily, to the use of acetonitrile as a mobile phase. On an annual basis, ketoprofen detection by CPS saves 333 kg 1.4 dichlorobenzene equivalents (1.4 DCB eq) of non-carcinogenic and 6.9 kg 1.4 DCB eq of carcinogenic human toxicities, 43.6 kg oil eq of fossil resources, and 91.4 kg CO2 eq of greenhouse gas emissions compared to HPLC. The high capital investment, maintenance costs, and reagents quantities required for HPLC mitigate the economic competitiveness of this traditional technique compared to the rapid and less complex portable CPS device under the studied conditions.

Nowadays there is a growing concern with the environment and sustainability, which means that better methods, including pollutants analysis, with less consumption of materials, organic solvents, and energy, need to be developed. Considering the almost inexistent information about the topic, the main goal of this work was to compare the environmental impacts of two analytical methods, a traditional one based on liquid chromatography with fluorescence detection and a newly developed carbon paper sensor. The selected analyte was 17α-ethinylestradiol, which is a contaminant of emergent concern in aquatic ecosystems due to its endocrine disruptor behavior. The life cycle assessment data showed that the sensor detection presents an almost negligible environmental impact when compared with the extraction step (the same for both methods) and the liquid chromatographic determination (roughly 80 times higher than with the sensor). The sensor values for all categories of damage are below 3% of the total method impacts, i.e., 1.6, 1.9, 2.4, and 2.9% for resources, climate change, human health, and ecosystem quality. The extraction represents 98.1% of the sensor environmental impacts (and 99.6% of its life cycle costing) and 38.8% of the chromatographic method. This study evidences the need of developing and applying greener analytical (detection and extraction) strategies.