八極桿碰撞/反應池ICPMS法測定果脯中的重金屬元素

符 靚

(長江師范學院化學化工學院，重慶涪陵408100)

八極桿碰撞/反應池ICPMS法測定果脯中的重金屬元素

符 靚

(長江師范學院化學化工學院，重慶涪陵408100)

采用微波消解-八極桿碰撞/反應池(ORS)-電感耦合等離子體質譜儀(ICP-MS)測定果脯中Cr、Mn、Co、Ni、Cu、As、Cd、Sb、Hg、Pb等10種重金屬元素的含量。樣品用硝酸+雙氧水分解后，試液直接用ICP-MS法進行測定。應用ORS技術，有效地消除了多原子離子對待測元素的干擾，選用Sc、Y、In、Bi等元素作內標混合液校正基體效應和信號漂移，確定了實驗的最佳測定條件。結果表明，該方法對10種待測元素的檢出限在0.001～0.039μg/L之間，相對標準偏差(RSD)均小于3.24%。該方法簡便、快速、準確，可以用來進行果脯的質量控制和安全評價。

電感耦合等離子體質譜法，八極桿碰撞/反應池，果脯，重金屬元素

Abstract:An analysis method of microwave digestion and inductively coupled plasma-mass spectrometry(ICP-MS)with octopole reaction system(ORS)was established for the determination of 10 heavy metal elements including Cr，Mn，Co，Ni，Cu，As，Cd，Sb，Hg and Pb in preserved fruits.Samples were decomposed by HNO3and H2O2followed by dilution with ultrapure water then the above 10 heavy metal elements in the solution were 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 were tested and discussed.Under the optimal conditions，the detection limits of the 10 elements were in the range of 0.001～0.039μg/L and the relative standard deviation(RSD)less than 3.24%，which showed that the method was very precise.The technique was applied in the quality control and safety evaluation of preserved fruits.

Key words:inductively coupled plasma mass spectrometry(ICP-MS);octopole reaction system(ORS);preserved fruits;heavy metal elements

果脯是用新鮮水果經過去皮、取核、糖水煮制、浸泡、烘干和整理包裝等主要工序制成的食品，鮮亮透明，表面干燥，稍有粘性，含水量在20%以下。果脯生產采用先進的制作方法和工藝，并進行嚴格檢驗，由于以高濃度的糖制成，因而各種微生物都難以在果脯中生存，產品便于貯藏。果脯中除含有許多人體需要的糖類、維生素和礦物質外，還含有大量人體所必需的微量元素，對于人體的生理發育以及生命活動均起著重要作用。果脯中的微量元素分為營養元素、無害元素和有害元素三類，有害元素主要指重金屬元素，不同品種的果脯由于選用的原材料和工藝不盡相同，果脯中重金屬元素的含量也不盡相同，因此其食用安全問題受到人們的廣泛關注［1-2］。……