Rapid automated in-situ monitoring of total dissolved iron and total dissolved manganese in underground water by reverse-flow injection with chemiluminescence detection during the process of water treatment

Abstract

Measurement of iron and manganese is very important in evaluating the quality of natural waters. We have constructed an automated Fe(II), total dissolved iron(TDI), Mn(II), and total dissolved manganese(TDM) analysis system for the quality control of underground drinking water by reverse flow injection analysis and chemiluminescence detection(rFIA-CL). The method is based on the measurement of the metal-catalyzed light emission from luminol oxidation by potassium periodate. The typical signal is a narrow peak, in which the height is proportional to light emitted and hence to the concentration of metal ions. The detection limits were 3 × 10 −6 μg ml −1 for Fe(II) and the linear range extents up to 1.0 × 10 −4 and 5 × 10 −6 μg ml −1 for Mn(II) cover a linear range to 1.0 × 10 −4 μg ml −1. This method was used for automated in-situ monitoring of total dissolved iron and total dissolved manganese in underground water during water treatment.