Figure 2
From: Analysis of free chlorine in aqueous solution at very low concentration with lateral flow tests
(a) Hyrel System30M 3D-Printer using a custom-made syringe-based print head for dispensing of the ink on the substrates. (b) Barcode flow test and single patch flow test while free chlorine solution flows through the tests. (c) Scheme of a conventional colorimetric dip test. (d) Scheme of a barcode flow test. (e) Scheme of a hybrid flow test with an inert sample pad. Please note that the schemes are not drawn to scale.
