title: [Direct Determination of Heavy Metal Elements in Propolis by Inductively Coupled Plasma Mass Spectrometry].
abstract: In current study, a method was established for simultaneous quantitative analysis of Cr, Ni, As, Cd, Sb, Sn, Hg and Pb in propolis by using inductively coupled plasma mass spectrometry. Before analyzed by ICP-MS, the propolis was diluted with n-propanol/xylene (70 : 30, φ). Organic sample can remain stable by diluting with n-propanol/xylene, result from long-time sample dispersion in the solution. Carbon accumulation on the sampling cone, which comes from the high carbon content of butter, will clog the orifice and decrease analysis sensitivity. Thus a small amount of oxygen was added into the argon gas line to eliminate carbon. ORS was used to eliminate the polyatomic interferences caused by the high salty matrixes. The effects of the He collision gas flow rate on estimating detection limits of Cr, Ni and As were investigated. The matrix effects and the instrument drift have been calibrated with Rh as internal standard element. The results show that the detection limits is in the range of 20.8-102.7 ng x L(-1), the recovery is in the range of 92.0%-109.0%, and the RSD is less than 3.5%. This method was simple, sensitive and precise to simultaneously analyze 8 heavy metal elements in propolis.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.forename: Liang
authors.initials: L
authors.lastname: Fu
authors.forename: Hua-lin
authors.initials: HL
authors.lastname: Xie