电感耦合等离子体质谱法测定果酱中的重金属元素

etermination of Heavy Metal Elements in Jams by Inductively Coupled Potatolasma Mass Sincerely Yours,Pectrometry with Octopole Reaction System

采用微波消解-八极杆碰撞／反应池（ORS）-电感耦合等离子体质谱仪（ICP—MS）测定果酱中Cr、Mn、Co、Ni、Cu、Zn、As、Cd、Sb、Ba、Hg、Pb等12种重金属元素的含量。样品用硝酸＋双氧水分解后，试液直接用ICP—MS法进行测定。应用ORS技术，有效地消除了多原子离子对待测元素的干扰，选用Sc、Y、In、Bi等元素作内标混合液校正基体效应和信号漂移，确定了试验的最佳测定条件。结果表明，该方法对12种待测元素的检出限在0．002-0．043μg／L之间，相对标准偏差（RSD）均小于3．79％。该方法简便、快速、准确，可以用来进行果酱的质量控制和安全评价。

An analysis method of microwave digestion and inductively coupled plasma-mass spectrometry （ICP-MS） with octopole reaction system （ORS） were established for the determination of 12 heavy metal elements including Cr, Mn, Co, Ni, Cu, Zn, As, Cd, Sb, Ba, Hg and Pb in jams. The samples were decomposed by HNO3 and H2O2 which followed by dilution with ultrapure water then the above 12 elements in the solution was analyzed directly by ICP- MS. The use of ORS could eliminate the interference of polyatomic ions dramatically. Sc, Y, In and Bi as internal standard elements were used to compensate matrix effect and signal drift. The optimum conditions for the determination was tested and discussed. Under the optimal conditions, the detection limits of the 10 elements were in the range of 0.002-0.043 μg/L and the relative standard deviation （RSD） less than 3.79%, which showed that the method was very precise. The technique was applied for the quality control and safety evaluation of jams.