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[Objective] To establish the method of microwave digestion- inductively coupled plasma mass spectrometry( ICP-MS),and to detect the nine elements( Cu,Mo,Ni,Hg,Se,As,Pb,Cr,Cd) in RHIZOMA CHUANXIONG,RADIX NOTOGINSENG,RADIX POLYGONI MULTIFLORI,RADIX ET RHIZOMA RHEI and RHIZOMA ATRACTYLODIS MACROCEPHALAE.[Methods]Nitric acid was used for digestion.The working conditions for ICP-MS were as follows: flow rate of carrier gas was 1.07 L/min; radio-frequency power was1 580 W; sample depth was 5.2 mm; mass resolution was 0.65- 0.80 amu; lifting speed of peristaltic pump was 0.5 r/min; atomizing chamber temperature was 2 ℃; oxide CeO +/ Ce+< 0.5%; double charged Ce2 +/ Ce+< 2%; scanning mode was jump peak mode.There were in all three repetitions; and the integral time was 0.3 s.[Results]Under the optimized conditions,the detection limits of nine elements were between 0.03 and 1.93 μg/L; RSD values were 1.4%- 3.9%; and recovery rates were between 89.5% and 108.1%.According to Green Trade Standards of Importing & Exporting Medicinal Plants,Pb,Cd,Hg,As and Zn contents in RHIZOMA CHUANXIONG,RADIX NOTOGINSENG,RADIX POLYGONI MULTIFLORI and RADIX ET RHIZOMA RHEI were under the standard level; but the Hg content in RHIZOMA ATRACTYLODIS MACROCEPHALAE was six times more than the standard level.However,Europe,Canada and the United States had more strict standards for heavy metals in Traditional Chinese Medicines[10].For instance,the United States forbid the import of Traditional Chinese Medicine containing Pb and Hg; and Canada forbid the import of Traditional Chinese Medicine having Pb,As and Hg.Therefore,more strict control was needed for the heavy metal content in Traditional Chinese Medicine.[Conclusions] This method was simple,accurate,effective and sensitive,and could be used for simultaneous analysis of the nine elements in rhizome herbs.
[Objective] To establish the method of microwave digestion-inductively coupled plasma mass spectrometry (ICP-MS), and to detect the nine elements (Cu, Mo, Ni, Hg, Se, As, Pb, Cr, Cd) in RHIZOMA CHUANXIONG , RADIX NOTOGINSENG, RADIX POLYGONI MULTIFLORI, RADIX ET RHIZOMA RHEI and RHIZOMA ATRACTYLODIS MACROCEPHALAE. [Methods] Nitric acid was used for digestion. The working conditions for ICP-MS were as follows: flow rate of carrier gas was 1.07 L / min; radio weight rate was 0.65-0.80 amu; lifting speed of peristaltic pump was 0.5 r / min; atomizing chamber temperature was 2 ° C; oxide CeO + / Ce + <0.5%; double charged And the integral time was 0.3 s. [Results] Under the optimized conditions, the detection limits of nine elements were between 0.03 and 1.93 μg / L; RSD values were 1.4% -3.9%; and recovery rates were between 89.5% and 108.1% .According to Green Trade Standa rds of Importing & Exporting Medicinal Plants, Pb, Cd, Hg, As and Zn contents in RHIZOMA CHUANXIONG, RADIX NOTOGINSENG, RADIX POLYGONI MULTIFLORI and RADIX ET RHIZOMA RHEI were under the standard level; but the Hg content in RHIZOMA ATRACTYLODIS MACROCEPHALAE was six times More than the standard level. However, Europe, Canada and the United States had more strict standards for heavy metals in Traditional Chinese Medicines [10]. For instance, the United States forbid the import of Traditional Chinese Medicine containing Pb and Hg; and Canada forbid the import of Traditional Chinese Medicine having Pb, As and Hg.Therefore, more strict control was needed for the heavy metal content in Traditional Chinese Medicine. [Conclusions] This method was simple, accurate, effective and sensitive, and could be used for simultaneous analysis of the nine elements in rhizome herbs.