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首页> 外文期刊>RSC Advances >Gas collision for improving the precision and accuracy of B-11/B-10 ratios determination in ICP-QMS and its application to determining wine provenance
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Gas collision for improving the precision and accuracy of B-11/B-10 ratios determination in ICP-QMS and its application to determining wine provenance

机译：气体碰撞，提高ICP-QMS中B-11 / B-10比率测定的精度和准确性及其在确定葡萄酒来源的应用

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摘要

Boron accumulates in plants with the same isotopic ratio as found in the source soil and water, producing isotope ratios (B-11/B-10) that reflect those of the sources, thus indicating the provenance of products derived from vegetative matter. We developed and validated a simple analytical method based on gas collision inductively coupled plasma quadrupole mass spectrometry (ICP-QMS) for the determination of B isotope ratios to distinguish the geographic origins of wines. Use of the gas collision technique (using Ne as the collision gas) in ICP-QMS can effectively improve the precision and accuracy of B-11/B-10 determination, which may be due to improvement of the ion transmission or sensitivity (via collisional focusing) and a reduction in plasma noise (via collisional energy damping). Compared with the conventional method (without Ne gas collision), the precision of the B-11/B-10 ratio was improved 3.2-fold (from 3.15 parts per thousand to 0.94 parts per thousand) and the accuracy was improved from an error of - 5.5% to - 0.1%. The - 0.1% error represents mass bias, resulting from in-cell gas collision, and can be accurately corrected using an external bracketing technique with NIST SRM-951 B isotope standard. Direct dilution of the wines by a factor of 100 with 1% HNO3 was found to substantially reduce matrix-induced mass discrimination. Other important parameters such as detector dead time, dwell time per data acquisition, and total integration time per isotope were also optimised. Twenty wines from nine countries were analysed, and delta B-11 values ranged from +1.73 to +46.6 parts per thousand with an average external precision (N = 5) of 0.82-1.63 parts per thousand. The proposed method has sufficient precision to distinguish between 20 wine brands originating from four different geographic regions.
机译：如在源土壤和水中发现，产生同位素比率（B-11 / B-10）反映这些的来源，从而指示从营养物质衍生产品出处硼积聚在以相同的同位素比率的植物。我们开发并验证了一个简单的分析方法基于对乙同位素比率的确定来区分葡萄酒的地理起源气体碰撞感应耦合等离子体四极杆质谱（ICP-QMS）。在ICP-QMS的气体碰撞技术（使用氖作为碰撞气体）的使用可以有效地改善的B-11 / B-10测定的精度和准确度，这可能是由于提高离子传递或敏感性（通过碰撞聚焦）和在血浆中的噪声（降低通过碰撞能量阻尼）。与常规方法（不Ne气碰撞）时，B-11 / B-10比的精度为（每千从3.15千分之0.94份）提高3.2倍和精度相比从的误差改善 - 5.5％至 - 0.1％。的 - 0.1％的误差表示质量偏差，从在电池内气体碰撞产生的，并且可以使用与NIST SRM-951乙同位素标准的外部包围技术来精确地校正。通过100用1％HNO 3的因子葡萄酒的直接稀释被发现显着降低基体 - 诱导的质量歧视。其他重要的参数，如检测器停滞时间，每个数据采集停留时间，以及每同位素总积分时间进行了优化。来自九个国家二十葡萄酒进行了分析，和delta B-11的值从千分之1.73至46.6份范围与0.82-1.63份每千的平均外部精度（N = 5）。所提出的方法具有足够的精度从四个不同的地理区域20葡萄酒品牌始发之间进行区分。

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  • 来源
    《RSC Advances》 |2016年第53期|共8页
  • 作者

    Guo Wei; Wu Zhiwei; Hu Shenghong; Jin Lanlan; Qiu Keyu; Guo Qinghai; Gan Yiqun;

  • 作者单位

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

    China Univ Geosci State Key Lab Biogeol &

    Environm Geol Wuhan 430074 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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