碩士 / 國立中興大學 / 土壤環境科學系所 / 103 / Deep-sea water industry is one of the economic activities that actively promotes by the government in recent years, and the most remarkable output of products is bottled drinking water desalted from deep-sea water. Some commercial deep-sea drinking waters (DSDW) are suspected to be manufactured with terrestrial freshwater duo to the production cost. Since the descriptions of counterfeit products are labelled from 100% deep-sea water, it will cause mislabeling. Because of the isotopic fractionation, hydrogen and oxygen isotopic compositions (δ2H and δ18O) of sea water are significantly different from those of terrestrial freshwater. For this, the purpose of this study is to confirm whether the commercial DSDW comes from seawater through analyzing the isotopic compositions of bottled samples, and further speculating reasons for deviation of the hydrogen and oxygen isotopic values by desalination processes. On the other hand, the commercial DSDW always brags that it contains rich minerals and trace elements that benefit human beings; however, all commercial DSDW have not marked the details including elemental kinds and concentrations on the labels. Therefore, another obligation of this study is to chemically characterize the commercial DSDW by determining the kinds and concentrations of trace elements with principal component analysis (PCA). The isotopic results indicate that samples from 100% deep-sea water exhibit δ2H and δ18O values around 0‰, respectively, and it means that the descriptions are correct. Samples from 100% deep-sea water are added brine with different doses through EC values. By comparison, the mislabeling samples display δ2H and δ18O values around -51 and -8‰, respectively, which are in the ranges of terrestrial freshwater. Also, the mislabeling samples are not added brine through EC values. Furthermore, The PCA results indicate that the scores of principal components (PCs) of the mislabeling samples are in the ranges between samples with correct descriptions and reverse osmosis water or deionized water in laboratory, and are identical to a mixed-water product manufactured by purified terrestrial freshwater adulterated with few amount of brine. This similarity implies that the mislabeling samples are manufactured by the same procedures as the mixed-water product. This study demonstrates a combined method involving stable isotopes and trace elements with PCA analysis which is applicable in assessing the source description of commercial DSDW. And it should be of great interest to similar future studies elsewhere.
| Identifer | oai:union.ndltd.org:TW/103NCHU5020028 |
| Date | January 2015 |
| Creators | Wen-Jui Liang, 梁文睿 |
| Contributors | Tsung-Ren Peng, 彭宗仁 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 72 |
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