A Μpad for Simultaneous Monitoring of Cu2+, Fe2+ and Free Chlorine in Drinking Water

Cu2+, Fe2+ and free chlorine are three important analyzes in drinking water. Firstly, the mu PAD for single analyze was easily fabricated. Detection limits for Cu2+, Fe2+ and free chlorine were 0.1 mg L-1, 0.1 mg L-1 and 0.2 mg L-1, respectively, less or equal to each Chinese Drinking Water Standard concentration and lower than those of most commercially available testing strips. Another mu PAD with two layers was then developed to monitor and report the safety level of these three analyzes in drinking water simultaneously. Moreover, the mu PADs for Fe2+ and free chlorine provided more distinguishable colors to users with naked eyes. The as-fabricated mu PAD not only demonstrated excellent anti-interference capability, production reproducibility, but also exhibited good applicability for real use in different kinds of drinking water.