Effects Of Heavy Metals And Its Chemical Remediation On The Growth And Quality Of Chinese Crude Drugs

This thesis was proposed on the basis of investigation of the situation of Chinese crude drugs polluted by heavy metals.Artemisiae Annuae was taken as an example in the experiments. The effects of heavy metals on the growth of Artemisiae Annuae and content of Artemisinin in Artemisiae Annuae were studied in a Potted Plant culture experiment, at the meantime, effects of adjust of applying coal fly ash, bentonite and humic acids on the growth of Artemisiae Annuae and content of Artemisinin in Artemisiae Annuae were studied. The main results were as follows:1 Review of pollution by heavy metals in Chinese crude drugsChinese crude drugs were polluted by heavy metals in different levels. The content of Cu, Pb, As, Cd, Hg exceeded the limited standard and the percentage was 21.0%, 12.0%, 9.7%, 28.5%, 6.9%; the phenomena of two, three and four metals exceeding limited standard simultaneity in the same drugs were also discovered and the percentage was 4.6%, 1.5%, 0.7%; the content of heavy metals in Radix P1atycodi, Asarum and Coptis was higher among the thirty-six Chinese crude drugs; All of the content of five heavy metals in Barbary Wolfberry Fruit, Anemone raddeana Regel, American Ginseng and fructus aurantii were below the limited standard; The pollution levels of heavy metals in different locality were different;the content of Cu, Pb in cultivated Chinese crude drugs was higher than that in wild Chinese crude drugs, while the content of As in wild Chinese crude drugs was higer than that in cultivated Chinese crude drugs.2 The effects of heavy metals on the growth of Artemisiae Annuae and Content of Artemisinin in Artemisiae Annuae.Copper reduced growth of Artemisiae Annuae,decreased the biomass and other plant growth charaeters. Also,copper reduced the content of Artemisinin. Lead reduced growth of Artemisiae Annuae and content of Artemisinin but the effects were not evident.Cadmium reduced growth of Artemisiae Annuae and the effects were obvious.The biomass and other plant growth charaeters decreased, also, the colour of Artemisiae Annuae leaf was yellow. However, the content of Artemisinin increased obviously when cadmium concentration in soil was 0.5mg/kg.Heavy metals compound pollution reduced growth of Artemisiae Annuae and content of Artemisinin, decreased the biomass and other plant growth charaeters. And the harm of Cu-Pb-Cd was obvious.3 Chemical remediation on the growth of Artemisiae Annuae and content of Artemisinin in Artemisiae AnnuaeApplied coal fly ash, bentonite and humic acids under stress of copper could promote the growth of Artemisiae Annuae, and the effects of coal fly ash was obvious. But three chemical additives could not increase the content of Artemisinin.Applied coal fly ash,bentonite and humic acids under stress of lead could promote the growth of Artemisiae Annuae, and the effects of coal fly ash was obvious. But three chemical additives could not increase the content of Artemisinin.Applied coal fly ash, bentonite and humic acids could hinder cadmium from poisoning Artemisiae Annuae plant growth, and the effects of humic acids was obvious. Three chemical additives could not increase the content of Artemisinin.Applied coal fly ash, bentonite and humic acids could hinder heavy metals compound from poisoning Artemisiae Annuae plant growth, and the effects of humic acids was obvious.Coal fly ash and humic acids increased the the content of Artemisinin.