Comparative Research of Two Pretreatment Methods on Determination of Trace Manganese in Panax Pseudo-ginseng var. notoginseng by Atomic Absorption Spectroscopy

摘要

In this research the atomic absorption spectroscopy method (the correlation coefficient was 0.9995) was employed for determination of the content of heavy metal-manganese in panax pseudo-ginseng var. notoginseng, which was chosen as the sample. The optimum conditions of two pretreatments were researched independently. In the dry ashing, the optimized temperature and time are 600°C and 4～6 hours respectively, and the manganese content determined is 53.16μg/g and the recovery rate of manganese added in sample is 98.64%. In the wet digestion, The HNO_3-H_2O_2 digestion system is the best one, and the content was 52.95μg/g and the recovery rate is 97.30%. So the two pretreatment methods of the sample are accurate enough on manganese content determination. But the dry ashing is better than the wet digestion relatively.