基于溶解无机碳中碳氧同位素及化学组分的瓶装饮用水产地真实性鉴别

Authentic Identification of Bottled Drinking Water Origin Based on Carbon and Oxygen Isotopes of Dissolved Inorganic Carbon and Chemical Composition

为了鉴别我国市场上销售的瓶装饮用水的产地和产品类型,本试验分析了瓶装饮用水溶解无机碳(DIC)中的δ^(18)O_(DIC)和δ^(13)C_(DIC)、水中的δ^(18)O和δ^(2)H值、矿物元素(K、Ca、Na、Mg、Sr)含量、阴离子(Cl^(-)、SO_(4)^(2- )、HCO_(3)^(-))含量、pH值与电导率等水化学指标,结合费希尔判别分析(Fisher-DA)建立模型,对瓶装饮用水的类别和产地进行鉴别。结果表明,不同产地瓶装饮用水的δ^(18)O_(DIC)、δ^(13)C_(DIC)、δ^(18)O、δ^(2)H值均具有显著差异,而且矿物元素与阴离子的含量变化范围广,具有不同的地域性特征。产地溯源判别模型对不同产地瓶装饮用水的判别准确率高达100%,且采用水化学指标还能区分瓶装饮用水的类型。正态化重要性分析显示,对产地具有指示效应的前五项重要指标分别为K、Cl^(-)和δ^(13)C_(DIC)、δ^(2)H和pH值。综上所述,通过稳定同位素指纹信息和水化学指标的差异进行融合分析,结合多元统计模型可有效鉴别市场上瓶装饮用水的真实性,保护消费者的合法权益,维护市场公平。

To identify the origin and product type of bottled drinking water sold in the marketδ^(18)O_(DIC)andδ;and C;of dissolved inorganic carbon(DIC),δ^(18)O andδ^(2)H valueand chemical indexes such as mineral elements(K,Ca,Na,Mg,Sr)and ion(Cl^(-),SO_(4)^(2-),HCO_(3)^(-))in the bottled drinking water were analyzed in this paper.The origin of bottled drinking water in China were verified by using Fisher discriminant analysis(Fisher-DA).The results showed thatδ^(18)O_(DIC)andδ^(13)C_(DIC),δ^(18)O andδ^(2)H value of bottled drinking water from different origins were significantly different,and the content of mineral elements and anions varied widely which could be used for origin traceability.The discriminant accuracy of the DA model for origin verification of the bottled drinking water was up to 100%,and hydrochemical analysis could distinguish the type of the bottled drinking water.The first five of importance for origin traceability were K,Cl^(-),δ^(13)C_(DIC),δ^(2)H and pH value according to the Normalizing importance analysis.Combining with stable isotope fingerprint,hydrochemical analysis and multivariate statistical model,the authenticity of bottled drinking water can be accurately distinguished,and therefore protect the legitimate rights and interests of consumers and maintain market fairness.