Determinations Of Trace Metal Elements By Atomic Absorption Spectrometry

To develop environment friendly materials and to produce nutrimental organic drinks are focused at present. The analysis methods of both heavy metals and trace elements needed by human body are very important. Trace metal elements in different matrixes were determined by atomic absorption spectrometry in this work. The conclusions are as follows:(l)Iron in layered crystal sodium disilicate and sodium silicate samples was measured by flame atomic absorption spectrometry (FAAS). The effects of matrix silicate and experimental conditions on the determination of iron were investigated. After the samples were dissolved with hydrochloric acid and 6 g·L^-1 of boric acid was added as a matrix modifier, the silicate interference was obviously eliminated. Under the optimum operating conditions, the determination results were satisfactory. The linear range of calibration curve was 0¹0.5μg·mL^-1, the relative standard deviation of method was 1.2%².2%, the recovery of added iron was 96.0%¹01%, the sensitivity was 0.19μg·mL^-1, and the detection limit was 77 ng·mL^-1. The analytical results of standard curve method were not different from those of colorimetry and standard addition calibration. The method avoids using dangerous acids such as hydrofluoric acid and perchloric acid, and has the merits of rapid sample preparation, reduced contamination risks. (2) Trace cadmium in paints by graphite furnace atomic absorption...