Modified 3D-printed device for mercury determination in waters.

3D printing technology is increasingly used in flow analysis， to develop low cost and tailor-made devices. The possibility of grafting specific molecules onto 3D printed parts offers new perspectives for the development of flow systems. In this study， a MPFS system including a dicarboxylate 1，5-diphenyl-3-thiocarbazone grafted 3D-printed device has been developed for mercury determination. For this purpose， the surface of 3D-printed cuboids was first modified with amine functional groups and then grafted with dicarboxylate 1，5-diphenyl-3-thiocarbazone. This new grafted device resulted in selective mercury preconcentration with extraction and elution yields higher than 90% even at high sampling flow rates. The detection can then be carried out in two ways: a direct detection of mercury extracted onto 3D-printed grafted cuboids by atomic absorption spectrophotometry after amalgam on gold or a detection of mercury in solution after elution with l-cysteine by spectrophotometry or cold vapour atomic absorption spectrometry.