[Studies on residues of organochlorine pesticides and heavy metals in soil of planting base and Pogostemon cablin].

OBJECTIVE: To determine and evaluate the residuals of organochlorine pesticides and heavy metals in soil and in Pogostemon cablin in order to provide for GAP planting. METHOD: GC method was applied to determine residuals of organochlorine pesticides, the contents of Pb, Cd, Cu, Cr, Hg and As were determined by IPC. RESULT: The contents of residuals of organochlorine pesticides and heavy metals were different among three cultivars and planting bases clearly, but all of the residuals in soil from three planting bases were below the second standard of Environmental quality standard for soils (GB15618), and the residuals in P. cablin also meet the "Green standards of medicinal plants and preparations for foreign trade and economy". CONCLUSION: Residuals of organochlorine pesticides and heavy metals in soil and P. cablin from three planting bases in Hainan province were conformed to GAP.

[Textual research on history of introduction [corrected] and herbal medicine of Pogostemon cablin].

OBJECTIVE: To study the history of introduction and herbal medicine of Pogostemon cablin by textual researches and clarify the confusion in literatures. METHOD: Textual research on historical literatures, practical applications and field investigation were adopted. RESULT: The varieties of P. cablin for therapeutic uses were not chaotic, however there has existed confusion between P. cablin and Agastache rugosus in descriptions of appellation, habitat and characteristic of the original plants. CONCLUSION: It was proved that the term "Huoxiang" in Chinese medicinal works before Ming Dynasty was pointed to P. cablin. The cultivation history of P. cablin in China was traced to Liang Dynasty or before.