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Advantages of reaction cell ICP-MS on doubly charged interferences for arsenic and selenium analysis in foods

机译：反应池ICP-MS对食品中砷和硒分析的双电荷干扰的优势

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摘要

Recent reports of As concentrations in certain food and drinks have garnered public concern and led to a lowering of the US guideline maximum concentration for inorganic As in apple juice and proposed limits for As in rice products. In contrast Se is an essential micro-nutrient that can be limiting when Se-poor soils yield Se-poor food crops. Rare earth element (REE) doubly charged interferences on As and Se can be significant even when initial ICP-MS tuning minimizes doubly charged formation. We analyzed NIST 1547 (peach leaves) and 1515 (apple leaves), which contain high levels of REEs, by quadrupole ICP-MS with (He) collision mode, H2 reaction mode or triple quadrupole ICP-MS (ICP-QQQ) in mass-shift mode (O2 and O2/H2). Analysis by collision cell ICP-MS significantly over-estimated As and Se concentration due to REE doubly charged formation; mathematical correction increased the accuracy of analysis but is prone to error when analyte concentration and sensitivity is low and interferent is high. For Se, H2 reaction mode was effective in suppressing Gd2+ leading to accurate determination of Se in both SRMs without the need for mathematical correction. ICP-QQQ using mass-shift mode for As+ from m/z 75 to AsO+ at m/z 91 and Se+ from m/z 78 to SeO+ at m/z 94 alleviated doubly charged effects and resulted in accurate determination of As and Se in both SRMs without the need for correction equations. Zr and Mo isobars at 91 and 94 were shown to be effectively rejected by the MS/MS capability of the ICP-QQQ.
机译：最近有关某些食品和饮料中As含量的报道引起了公众的关注，并导致降低了美国指南中苹果汁中无机As的最大浓度和大米产品中As的限量建议。相反，硒是必需的微量营养素，当贫硒的土壤生产贫硒的粮食作物时，硒会受到限制。即使最初的ICP-MS调谐可以最大程度地减少双电荷的形成，稀土元素（REE）对As和Se的双电荷干扰也会非常明显。我们通过具有（He）碰撞模式，H2反应模式或三重四极杆ICP-MS（ICP-QQQ）的四极杆ICP-MS分析了含有高水平稀土元素的NIST 1547（桃叶）和1515（苹果叶）换档模式（O2和O2 / H2）。碰撞池ICP-MS分析表明，由于REE双电荷形成，As和Se浓度明显高估；数学校正可提高分析的准确性，但当分析物浓度和灵敏度较低且干扰物较高时，则容易出错。对于Se，H2反应模式可有效抑制Gd 2 + ，从而无需数学校正即可准确测定两个SRM中的Se。使用质量转移模式的ICP-MS / MS从m / z 75到As + 在m / z 91处从Se + m / z 94处的/ z 78到SeO + 减轻了双电荷效应，无需校正方程即可准确测定两个SRM中的As和Se。已显示ICP-MS / MS的91/94处的Zr和Mo等压线被有效地拒绝了。

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    Brian Jackson; Amir Liba; Jenny Nelson;

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  • 年(卷),期 -1(2015),-1
  • 年度 -1
  • 页码 1039/C4JA00310A
  • 总页数 9
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