Abstract:

Abstract: Resonance light scattering (RLS) is a new analytical techniques developed in recent years，it has simple，fast, and high sensitivity characteristics, and has been used to trace element or material analysis. Under alkaline solution, formaldehyde can be reduced by Ag+, as a result of forming silver yellow plastic, leading to the RLS intensities of the system enhanced. Base on these phenomena, a new RLS method for trace formaldehyde determination in environment water sample was established. Under the optimizing reaction conditions，the enhanced RLS intensities of the system has good relationship with the concentration of formaldehyde in the range of 1.0×10-6 ?2.0×10-5 mol/L with the detection limit of 1.0×10-7 mol/L. The recovery is in the range of 96.26% to 103.32% for formaldehyde detection in environmental water sample and in the indoor air. According to the phenomenon that the resultant from the reaction of Ag+ and formaldehyde has different color at the present of different concentration of formaldehyde, a visual semi-quantificational method for detection of formaldehyde could be achieved.

Key words: Visual Determination, Resonance Light Scattering, Formaldehyde, Silver Nanoparticles