Abstract:

A new method for the determination of essential elements (Na, Mg, P, K, Ca, Mn, Fe, Cu, Zn, and Sr) and toxic
elements (Ni, As, Cd, and Pb) in Flos Buddlejae was established using inductively coupled plasma optical emission spectrometry
(ICP-OES). Nitric acid and hydrogen peroxide were used jointly to achieve the complete decomposition of the organic matrix in a
closed-vessel microwave oven. Appropriate analysis lines for various elements were selected. Y as internal standard element was
used to compensate matrix effect and signal drift, and the stability of the instrument was improved. Under the optimal conditions,
the detection limits were 0.011–25.16 μg/L. The accuracy and precision of this method were confirmed through reference standard
materials (NIST SRM 1515, apple leaves). The results showed a good agreement between measured and predicted values for all
analyzed elements. The relative standard deviation (RSD) was in the range of 2.0% to 8.3%. This method proved simple, sensitive
and precise and could allow simultaneous multi-element determination of Flos Buddlejae.

Key words: inductively coupled plasma optical emission spectrometry, Flos Buddlejae, essential elements, toxic elements