Fresh herbs collected in a non-contaminated rural area were collected, mixed and processed as for drug production by Herbapol S.A. (Poland). Mixed herbs were then comminuted and sieved in conditions proventing contamination with metals and next homogenize

This Standard Reference Material (SRM) is intended primarily for use in evaluating the reliability of analytical methods for the determination of major, minor, and trace elements, proximates, calories, and total dietary fiber in botanical materials, agric

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The material was prepared from black tea, usually packed in tea bags. Tea leaves collected and processed in Argentina were ground and sieved. All precautions were taken to avoid contamination of the material with metals. The next step was homogenization b

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