APPLICATION OF MAJOR ION CONCENTRATIONS FOR THE PREDICTION OF STABLE ISOTOPIC COMPOSITION IN SURFACE WATER
1
Citation
38
Reference
10
Related Paper
Citation Trend
Abstract:
The δ2H and δ18O values in water bodies are essential to the management of water resources because of the ability to insight into hydrological processes. In this study, we have measured and analyzed the major ions (Na+, K+, Ca2+, Mg2+, Cl–, SO24– and HCO–3 ) and stable H-O isotopes (δ2H and δ18O) for fifteen surface water samples collected from the Xinbian River in Suzhou, northern Anhui Province, China. The results show that all of the water samples are classified to be Na-HCO3 type, and the mean values of δ2H and δ18O are –42.93‰ and –5.36‰, respectively. Gibbs diagram and the relationship between δ2H and δ18O indicate that both water chemistry and stable isotopes in river water are mainly controlled by evaporation. Correlation analysis reveals that a significant correlation between major ions and δ18O. Predictors (K+, SO24– and HCO–3 ) have been selected by optimal subset regression analysis were used to model the δ18O values in the river water. Moreover, the residuals of the model were normally distributed and values between –0.2‰ to 0.2‰ for most water samples, suggesting a strong relationship between the observed and predicted δ18O values.Keywords:
δ18O
Isotope Analysis
Isotopic ranges used to distinguish plant groups and types of animal protein vary according to local ecology and isotope mixing systems, as well as anthropogenic influences. This chapter reviews sources of isotopic variation in foods and proposes a conceptual model for how isotopic analysis of local foods can isotopic baselines and improve our understanding of the diets and foodways of past people. Previously published data from central and southern Gulf Coast Florida (3100 BC–AD 1550) and Atlantic coastal North Carolina (AD 800–1650) are used as case studies to illustrate the interpretive benefits of incorporating stable isotope analysis of local foods into dietary reconstruction.
Isotope Analysis
Foodways
δ15N
Cite
Citations (0)
δ18O
Carbon fibers
Isotope Analysis
Cite
Citations (12)
The stable isotope change in the Yamzho Lake Basin is discussed based on the observed results of stable isotope of precipitation,river and lake water in 2004 and on the stable isotope fractionation model in a closed lake.This study shows that the present-5.9‰ of Yamzho Lake δ18O is related to the eventual steady lake δ18O after evaporation enrichment under the relative humidity of around 54%~58%.It is also found that the input δ18O to the closed lake has also affected the eventual δ18O after evaporation enrichment.However,the impact of the lake water temperature has little effect on the steady lake δ18O.The lake itself has a strong adjustment to the input δ18O change.For the large change of input δ18O,the Yamzho Lake δ18O can reach another steady state in less than 50 years.
δ18O
Water cycle
Cite
Citations (1)
Stable isotopic composition of fossil ostracode is used as an ideal proxy for paleo-lake sedimentary environments.Over the last three decades,measurements of the δ13C and δ18O values of ostracode shells have been extensively used in lake palaeoenvironmental reconstruction.Many methods for sample preparation have been applied in stable isotope measurements of ostracode shells from lake sediments.However,for stable isotope measurements of biocarbonate samples,different methods will probably affect the resolution,reproducibility and inter-laboratory comparison of the measurement results.In this paper,previous methods of sample preparation for biocarbonate isotopic measurements are compared,with their effects on δ13C and δ18O analyses evaluated.The results suggest that different methods will not result in remarkable differences in δ13C and δ18O measurements of lake ostracode shells.Therefore,sample cleaning procedure is considered unnecessary for such analyses.
δ18O
Isotopic ratio
Isotope Analysis
Proxy (statistics)
Cite
Citations (0)
The study of stable isotopes in tree rings,including δ13C,δ18O and δD,as a potential tool for studying dendrochronology,has rapidly developed and widely applied in the past 30 years.To extract α-cellulose from wood is a necessary pretreatment for palaeoclimate and palaeoenvironment studies by using tree-ring stable isotopes.However,it is time-consuming and labor-intensive.With the purpose of drawing forth more attention to the experimental flow for obtaining isotopic samples in tree rings and eliminating differences resulted from divergent experimental processes,the extraction procedures of cellulose and cellulose nitrate both at home and abroad in the recent years are summarized in this paper.The extraction method used in our research group is also provided.Their feasibility is also discussed.It is expected that more attentions will be paid to the influences of samples pretreatment on the stable isotopic values and to eliminate them in the studies of palaeoclimate,palaeoenvironment and ecology.
Isotope Analysis
δ18O
δ15N
Tree (set theory)
Cite
Citations (4)
The δ2H and δ18O values in water bodies are essential to the management of water resources because of the ability to insight into hydrological processes. In this study, we have measured and analyzed the major ions (Na+, K+, Ca2+, Mg2+, Cl–, SO24– and HCO–3 ) and stable H-O isotopes (δ2H and δ18O) for fifteen surface water samples collected from the Xinbian River in Suzhou, northern Anhui Province, China. The results show that all of the water samples are classified to be Na-HCO3 type, and the mean values of δ2H and δ18O are –42.93‰ and –5.36‰, respectively. Gibbs diagram and the relationship between δ2H and δ18O indicate that both water chemistry and stable isotopes in river water are mainly controlled by evaporation. Correlation analysis reveals that a significant correlation between major ions and δ18O. Predictors (K+, SO24– and HCO–3 ) have been selected by optimal subset regression analysis were used to model the δ18O values in the river water. Moreover, the residuals of the model were normally distributed and values between –0.2‰ to 0.2‰ for most water samples, suggesting a strong relationship between the observed and predicted δ18O values.
δ18O
Isotope Analysis
Cite
Citations (1)