Study On The Biological Correlation Of Lead, Chromium, Selenium In Chinese Herbal Medicines And Their Growing Soils

The problem of superscale heavy metals in chinese traditional medicines iswidely concerned in recent years. Heavy metal content in chinese herbal medicine iscertainly related to heavy metal content in the growing soils of chinese herb medicine.The content of lead, chromium, selenium element in 5 mature chinese herbalmedicines from Gansu and the growing soils of chinese herbal medicines'root isdetermined. After comparing microwave digestion with high-temperature ashing forsample treatment, microwave digestion is choosed in the experiments. The biologicalcorrelation of lead, chromium, selenium in chinese herbal medicines and theirgrowing soils is extensively discussed.The results show that biological mobility of Pb is existence from soil to chineseherbal medicines. The biological mobility of Pb is the strongest in radix isatidis and isthe weakest in radix angelica sinensis. In these chinese herbal medicines, theenrichment coefficient of Pb is less than 0.2. These results show that the biologicalmobility and enrichment of Pb is weaker. The relative standard deviations ofdetermination results of chinese herbal medicines and soils are 4.06% and 0.59%,respectively. The recovery of standard addition is between 93% and 108%.Cr contents in radix isatidis, radix glycyrrhiza, radix bupleuri and radix engelicasinensis are significantly higher than that of Cr content in soils. The enrichmentcoefficient of Cr in radix isatidis, radix glycyrrhiza, radix bupleuri and radix engelicasinensis is higher than 1. Although Cr content in radix glycyrrhiza is less than that ofCr content in soil, the enrichment coefficient of Cr in radix glycyrrhiza is close to 1.These results show that the biological mobility and enrichment of Cr is stronger. Therelative standard deviations of determination results of chinese herbal medicines andsoils are 0.06% and 0.50%, respectively. The recovery of standard addition is between 94% and 105%.Se contents in the other 4 chinese medicine herbals are significantly higher thanthat of Se content in soil, except for radix glycyrrhiza. The enrichment coefficient ofSe in these chinese medicine herbals are higher than or close to 1. These experimentalresults show that the biological mobility and enrichment of Se is stronger. The relativestandard deviations of determination results of chinese herbal medicines and soils are1.04% and 0.59%, respectively. The recovery of standard addition is between 93%and 110%.