Document Type : Full research article

Authors

• Hossein Tavallali
• Abolfath Parhami
• Abbas Karimpour
• Mohammad Ali Karimi

Department of Chemistry, Payame Noor University 19395-4697 Tehran, I.R.Iran

Abstract

In this study, a new colorimetric sensor based on a couple of Congo Red (CR) and Alizarin Red S (ALRs) was ready for the detection of the carbonate in tracing levels in aqueous media. The linear range of carbonate derived from the results of this simple, selective, and rapid determination, was 1.21 × 10^-6–9.51 × 10^-5 mol L^-1 with the detection limit of 1.31 × 10^-7 mol L^-1. In the examined cases, the concomitant cations, anions, and weak acids ( I^-, Br^-, F^-, Cl^-, SCN^-, SO₃^2-, S₂O₃^2-, S₂O₈^2-, OAc^-, H₂PO₄^-, HPO₄^2-, NO₃^-, C₂O₄^2-, HCO₃^-, BrO₃^-, IO₃^-, Cit^3-), ( K⁺, Na⁺, <1.5 × 10^-4 mol L^-1 ) did not curb the analysis by creating the disturbance of chemical ions. The recoveries shown in the range of 98.6–102.5% indicate the high validity of the method in water samples. Typically, this compound presented was affordable and fast, with a trouble-free operation, which can consider as a good carbonate receiver in running water greenhouses and arable land. In addition, due to the sophisticated modifications made to filter paper strips, this chemical sensor has the potential capacity to be used as a carbonate solid colorimetric indicator.

Keywords

• Colorimetric Chemosensor
• Naked-eye detection
• Alizarin-Red S
• Congo-Red
• Carbonate recognition
• Tap water