Creation of na image capture device for collective monitoring of water quality

Abstract

This study presents the development, validation, and application of an image capture device for participatory water quality monitoring, integrating additive manufacturing, digital colorimetric analysis, and citizen science principles. It aims to democratize access to environmental monitoring tools in regions with limited laboratory infrastructure, empowering communities to take a leading role in the management of their water resources. The designed device was manufactured using recycled polylactic acid filament, fused deposition modeling additive manufacturing, and equipped with a custom standardized optical system for smartphone capture. Samples containing nitrite, ammonia, orthophosphate, and iron were analyzed using the AQUA application to extract red, green and blue values and determine calibration curves, which showed correlation coefficients greater than 0.95 for all analytes, demonstrating high analytical accuracy. Statistical validation using a paired t-test showed significant good agreement with ultraviolet-visible spectrophotometry. Field tests showed that the device can be operated by volunteers without technical training, reinforcing its robust potential for environmental education and citizen science. The project's reduced cost, portability, and open replicability make it a highly viable and scalable sustainable alternative for community-based water surveillance initiatives. The study contributes to Sustainable Development Goals 6 and 11 by promoting social participation in environmental management and accessible technological innovation.