In this paper,a method based on PAM/SA/PVA composite hydrogel for the visual and rapid detection of ferrous ions (Fe2+) in water was established.Using ion cross-linking method,the metal ion chromogenic reagent was loaded into the gel network to prepare a dual-network structure hydrogel for the visual detection of Fe2+.This highly specific hydrogel with dual-network structure and combining with metal ion chromogenic reagent had adsorption effect on Fe2+,so that Fe2+ could be continuously adsorbed in the hydrogel,reacted with the metal ion indicator in the hydrogel,and continuously enriched to achieve rapid qualitative and quantitative analysis of Fe2+.The gel was not easily damaged and was convenient to carry,enabling quick determination the Fe2+ concentration range in wastewater on site,which realized simple and rapid detection of Fe2+ in water.Under the best experimental conditions,the Fe2+ concentration in the range of 10-4~1g/L had a linear relationship with the ultraviolet-visible absorbance at a wavelength of 512 nm after color development with the hydrogel,and the color development effect of the gel was good enough for visually determining the concentration range of Fe2+ in the water body.This research not only met the requirements for on-site detection of Fe2+ in the environment,but also provided an important basis for the prevention and control of Fe2+ pollution.
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