[Preparation and characterization of Radix Salvia reference material for heavy metals under GAP control]

To prepare and characterize the heavy metal reference material of radix salvia planted in Zhongjiang, Sichuan province under the good agricultural procedure (GAP).

After being prepared, the reference material was digested with 65% HNO3 and H2O2 by microwave-assisted oven systems, and the heavy metals in Radix salvia reference material were accurately determined by inductively coupled plasma mass spectrometry (ICP-MS).

The measuring method was validated by running certificated reference materials, including bush twigs and leaves (GBW07602) and tea twigs and leaves (GBW07605) under the same conditions. The recoveries of the elements mostly ranged from 90% to 110%, and the RSD was within 5%. The measurement of radix salvia reference material was carried out by different laboratories with ICP-MS and by several time intervals in one year for the stability. The results showed that the concentration of the heavy metals provided were accurate and the reference material was stable.

The reference material is suitable to be the criterions of heavy metals for radix salvia in the qualities controlling, and is also suitable to be the criterion of poisonous heavy metals of other herbs in the administration of GAP.