A Soil Water Extraction Method Using Accelerated Solvent Extraction Technique for Stable Isotope Analysis
10.11895/j.issn.0253-3820.140227
- VernacularTitle:加速溶剂萃取-同位素质谱分析土壤水的氢氧同位素
- Author:
Qingzeng ZHU
;
Qing SUN
;
Zhiguo SU
;
Manman XIE
;
Junyong SONG
;
Yabing SHAN
;
Ning WANG
;
Guoqiang CHU
- Publication Type:Journal Article
- Keywords:
Soil water;
Hydrogen isotope;
Oxygen isotope;
Accelerated solvent extraction
- From:
Chinese Journal of Analytical Chemistry
2014;(9):1270-1275
- CountryChina
- Language:Chinese
-
Abstract:
Soil water is one of the most important components in hydrological cycle. The stable hydrogen and oxygen isotopes in soil water have been increasingly used in the ecological, environment and hydrological research. In view of different techniques for extracting soil water, there is significant difference in theδD andδ18 O composition. This paper presents a method for analyzing hydrogen and oxygen isotopes in soil water by using elemental analyzer and isotope ratio mass spectrometry with accelerated solvent extraction for sample pretreatment. The conditions are: extraction solvent: dichloromethane, temperature: 100 ℃, pressure of 10. 3 MPa, static time:10 min. The samples were extracted three times, and with cycle values of four, four and three, respectively. Comparing with the added water, the deuterium and oxygen isotope values in the extracted soil water enrich 2. 12‰-4. 58‰ and 0. 17‰-0. 93‰, respectively. The reproducibility of replicate extractions of soil water is around ±0. 89‰ for δD and ±0. 37‰ for δ18 O.
