An effective analytical system based on an ultraviolet atomizer for trace cadmium determination using atomic fluorescence spectrometry

摘要

A novel ultraviolet (UV) atomization atomic fluorescence spectrometry (UV-AFS) system was developed for the quantitative analysis of trace cadmium ions (Cd) without preconcentration. Cd ~(2+) can transform into Cd ~(0) and Cd hydride (CdH _(2) ) gas vapor after hydride generation (HG) with KBH _(4) . With the help of a simple, low power and low temperature UV atomizer, CdH _(2) can be converted to Cd ~(0) and thus the total Cd was detected. Due to the high atomization efficiency and low carrier gas dilution of the UV atomizer, the analytical system provides high sensitivity with a limit of detection (LOD) of 0.006 ng mL ~(?1) , which was comparable to those obtained by preconcentration methods. The relative standard deviation (RSD) ( n = 11) was better than 2.1% at a concentration of 0.5 ng mL ~(?1) . Its application was demonstrated by analyzing Certified Reference Materials and food samples for ultra-trace detection of Cd ~(2+) .