FAAS Determination of 9 Metal Elements in Fructus Ligustri Lucidi with Microwave Assisted Sample Digestion

Flame atomic absorption spectrometry was applied to the determination of 9 metal elements,i.e.,Ca,Mg,K,Na,Fe,Sr,Mn,Cu and Zn,in the traditional Chinese medicine of Fructus ligustri lucidi.The sample was digested with a mixture of HNO3 and H2O2 (4+1,by vol.) in a microwave digestor.The sample solution was diluted to 50.0 mL,and used for FAAS determination.Detection limits (3S/N) found for the 9 elements were in the range of 0.000 6 to 0.024 8 mg·L-1.Tests for recovery and precision were made by standard addition method,and values of recovery and RSD′s (n=10) found were in ranges of 93.0%-107.3% and 0.86%-4.39% respectively.Amounts of the 9 elements found in the medicine sample were as follows:K 16 940 μg·g-1,Ca 1 790 μg·g-1,Mg 1 640 μg·g-1,Fe 467.8 μg·g-1,Na 116.0 μg·g-1,Zn 24.5 μg·g-1,Mn 15.0 μg·g-1,Cu 9.6 μg·g-1,Sr 1.9 μg·g-1 and the ratio of Zn/Cu attained to a value of 2.55.These data were useful in going further into the mechanism of therapeutic effect of the medicine in treating cardiocerebral vascular diseases.