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

机译：气体碰撞，提高ICP-QMS的11B / 10B比率的精度和精度及其在确定葡萄酒来源的应用

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Boron accumulates in plants with the same isotopic ratio as found in the source soil and water, producing isotope ratios ( ~(11) B/ ~(10) B) 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 ~(11) B/ ~(10) B 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 ~(11) B/ ~(10) B ratio was improved 3.2-fold (from 3.15‰ to 0.94‰) 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% HNO _(3) 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 δ ~(11) B values ranged from +1.73 to +46.6‰ with an average external precision ( N = 5) of 0.82–1.63‰. The proposed method has sufficient precision to distinguish between 20 wine brands originating from four different geographic regions.
机译：硼在源土壤和水中发现的同位素比的植物中积聚在源土壤和水中，产生同位素比（〜（11）b /〜（10）b）反映来源的比例，从而表明来自植物植物的产物的出处事情。我们开发并验证了一种基于气体碰撞电感耦合等离子体四极谱质谱（ICP-QMS）的简单分析方法，用于测定B同位素比以区分葡萄酒的地理起源。在ICP-QMS中使用气体碰撞技术（使用NE作为碰撞气体）可以有效地提高〜（11）B /〜（10）B确定的精度和精度，这可能是由于离子传输的改善或灵敏度（通过碰撞聚焦）和等离子体噪声的降低（通过碰撞能量阻尼）。与常规方法（没有NE气体碰撞）相比，〜（11）B /〜（10）B比的精度提高了3.2倍（从3.15‰到0.94°），从错误的误差提高了精度？5.5％至？0.1％。 Δ0％误差表示质量偏压，由细胞气体碰撞产生，并且可以使用NIST SRM-951b同位素标准的外部包围技术精确地校正。将葡萄酒直接稀释100系列100具有1％HNO _（3），以显着降低基质诱导的质量辨别。还优化了其他重要参数，例如检测器死区时间，每次数据采集的停留时间和每个同位素的总集成时间。分析来自九个国家的二十个葡萄酒，Δ〜（11）B值范围为+1.73至+ 46.6‰，平均外部精度（n = 5）为0.82-1.63‰。该方法具有足够的精确度，以区分起源于四种不同地理区域的20个葡萄酒品牌。

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