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- Title
Examination, optimization and application of automatic cryogenic vacuum distillation system.
- Authors
JIAN Jing; WEN Wei; SONG Xin
- Abstract
Cryogenic extraction of water from plant and soil samples constitutes a critical element in isotope ecohydrological studies. This study was undertaken to examine the stability and reliability of a new generation of water extraction technology based on cryogenic vacuum distillation (CVD)-automatic cryogenic vacuum distillation water extraction system, and to optimize the extraction time and improve the extraction efficiency for this system, as well as to explore the applicability of this system. For these purposes, water extraction from tap water and leaves and stems of four species of woody plants was carried out by using manual and automatic CVD systems and then the hydrogen and oxygen isotope values (δ2H and δ18O) of water extracted from the two systems were compared. Besides, rehydrated leaves, stems and soils were extracted by manual CVD system and automatic CVD system under different extraction time lengths, then the δ2H, δ18O of water extracted with the two systems were compared too. Moreover, we conducted a separate experiment to use the automatic CVD system to confirm the depth of water absorption and the utilization ratio of source water of Osmanthus fragrans (Thunb. ) Loureiro. The results are as follows. There is no significant difference in the hydrogen and oxygen isotope values (δ²H, δ18O) of water extracted with the two systems and that data obtained from the two methods are strongly linearly correlated, with the correlation line being statistically indistinguishable from the 1:1 line. The δ²H and δ18O values of rehydrated sample water extracted from leaves, stems and soils for 1 h, 2 h, and 2 h by automatic CVD system are not statistically different from those extracted by manual CVD system. The depth of water uptake and the proportion of water use of Osmanthus fragrans (Thunb. ) Loureiro determined based on δ²H is inconsistent with that determined based on δ18O. Therefore, this study systematically verifies for the first time that there is no difference between automatic CVD system and manual CVD system, which provides a guarantee of reliability in the related application of isotope eco-hydrology; further, this study enables us to establish recommendations on optimizing the extraction time and improving the extraction efficiency for the automatic CVD system. Meanwhile, our finding of that the δ²H of water extracted from the rehydrated samples were more depleted than the reference water adds evidence to the recently revealed phenomenon of "deuterium deviation" as caused by CVD in the ecohydrological field; as such, we suggest more caution in utilizing CVD-generated δ²H data to trace plant water sources and determine the water use strategies in plant and ecosystem studies.
- Publication
Journal of Shenzhen University Science & Engineering, 2023, Vol 40, Issue 2, p179
- ISSN
1000-2618
- Publication type
Article
- DOI
10.3724/SP.J.1249.2023.02179