Coetzee Paul P, Vanhaecke Frank
Department of Chemistry, University of Johannesburg, 524, Johannesburg 2006, South Africa.
Anal Bioanal Chem. 2005 Nov;383(6):977-84. doi: 10.1007/s00216-005-0093-7. Epub 2005 Nov 9.
The potential of quadrupole-based ICP-MS as a tool for B-isotopic analysis of wines and its usefulness in provenance determinations were assessed. A precision of 0.1-0.25% RSD (corresponding to a relative standard deviation of the mean of three replicate measurements of 0.06-0.12%) was sufficient to establish small differences in the B isotope ratios in wines from different geographical origins. Each sample measurement was bracketed by measurements of a standard and mass bias drift correction made by interpolation. Sample preparation was kept to a minimum to avoid possible fractionation. Dilution of the wine samples by a factor of 100 with 0.65% HNO3 was found to reduce matrix-induced mass discrimination substantially. Wines from three wine-producing regions, Stellenbosch, Robertson, and Swartland, in the Western Cape Province of South Africa, and wines from specific regions in France (Bergerac) and Italy (Valpolicella) were analyzed by ICP-QMS for their B-isotopic compositions. It was concluded that the 11B/10B ratios can be used to characterize wines from different geographical origins. Average 11B/10B ratios in red wines from South Africa (Stellenbosch), France (Bergerac), and Italy (Valpolicella) were found to differ by between 0.5 and 1.5%.
评估了基于四极杆的电感耦合等离子体质谱（ICP-MS）作为葡萄酒硼同位素分析工具的潜力及其在产地鉴定中的实用性。0.1-0.25%的相对标准偏差（RSD）精度（相当于三次重复测量平均值的相对标准偏差为0.06-0.12%）足以确定不同地理来源葡萄酒中硼同位素比率的微小差异。每次样品测量都通过标准测量和通过插值进行的质量偏倚漂移校正来界定。样品制备尽量减少，以避免可能的分馏。发现用0.65%的硝酸将葡萄酒样品稀释100倍可大幅降低基质诱导的质量歧视。采用电感耦合等离子体质谱（ICP-QMS）分析了南非西开普省三个葡萄酒产区（斯泰伦博斯、罗伯逊和斯瓦特兰）以及法国（贝杰拉克）和意大利（瓦尔波利切拉）特定地区的葡萄酒的硼同位素组成。得出的结论是，11B/10B比率可用于表征不同地理来源的葡萄酒。发现南非（斯泰伦博斯）、法国（贝杰拉克）和意大利（瓦尔波利切拉）红葡萄酒的平均11B/10B比率相差0.5至1.5%。
