Assessing the authenticity of commercial deep-sea drinking water by chemical and isotopic approaches.
This study combines stable isotopes and chemical elements with statistical principal component analysis (PCA) to assess the authenticity of bottled commercial drinking water desalinized from deep seawater in the Taiwan market. Isotopic results indicate that true bottled deep-sea drinking water (DSDW) exhibits about 0 ‰ for both δ(2)H and δ(18)O values, which are values similar to those of open seawater. By comparison, suspected counterfeit DSDW products display δ(2)H and δ(18)O values of around -51 ‰ and -8 ‰, respectively. These values are representative of terrestrial freshwater. In addition, suspected counterfeit DSDWs have δ and electrical conductivity values similar to a mixed water (MW) product that was manufactured by purifying terrestrial freshwater and adulterating this with small amounts of brine. Furthermore, PCA results indicate the chemical constitution of suspected DSDW products to be similar to the MW product which falls between purified terrestrial freshwater and desalinized open seawater. These similarities imply that suspected counterfeit DSDW products are manufactured in a similar manner to the declared MW product. This study demonstrates how combining knowledge of stable water isotopes and PCA can be used in assessing the authenticity of commercial DSDW products. The method should be of great interest to similar investigations elsewhere.
a Department of Soil and Environmental Sciences , National Chung Hsing University , Taichung , Taiwan.
Tsung-Ren
TR
Peng
Wen-Jui
WJ
Liang
Tsang-Sen
TS
Liu
Yu-Wen
YW
Lin
Wen-Jun
WJ
Zhan
D003903:Deuterium / Q000032:analysis; D060766:Drinking Water / Q000032:analysis*; D005618:Fresh Water / Q000032:analysis*; D010103:Oxygen Isotopes / Q000032:analysis; D012623:Seawater / Q000032:analysis*; D013624:Taiwan
D060766:Drinking Water; D010103:Oxygen Isotopes; D003903:Deuterium
authenticity; deep-sea drinking water; hydrogen-2; oxygen-18; principal component analysis; stable isotope tracer technique