Abstract:
A nitric acid-hydrogen peroxide, hydrofluoric acid system was used to digest samples from different parts of ramie. After the further digestion using an intelligent temperature control heater, four heavy metal elements in different parts of ramie were detected by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the method is simple, fast, sensitive, and has a good linearity. The detection limit of each element was
52Cr 0.05 mg/kg,
75As 0.02 mg/kg,
111Cd 0.02 mg/kg,
208Pb 0.03 mg/kg. The linear ranges were 0.5~50 mg/kg for Cr, 0.1~12.5 mg/kg for As and Cd, 0.2~25 mg/kg for Pb. The results showed, that the precision and stability of the method were good. The recoveries ranged from 80.0% to 125%. The levels of four heavy metal elements in different parts of ramie were preliminarily determined, and the different parts of ramie have certain adsorption effects on heavy metals in the soil.