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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:

2012年第03期

Page:

83-88

Research Field:

水资源与环境

Publishing date:

Info

Title:

Seasonal Variation of Sulfur Isotope in Dengzhanhe Karst Spring of Puding, Guizhou

Author(s):

ZHAO Min¹; 2;  ZENG Cheng¹; 2;  YANG Rui¹; 2;  LIU Zai-hua¹; 2

1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Guizhou, China; 2. Puding Comprehensive Karst Ecological Experiment Station,Institute of Geochemistry, Chinese Academy of Sciences, Puding 562100, Guizhou, China

Keywords:

hydrogeochemistry;  sulfur isotope;  dissolution;  oxidation;  organic sulfur;  spring;  karst;  Guizhou

PACS:

P595; P641.3

DOI:

-

Abstract:

The concentration of sulfate is high in Dengzhanhe karst spring located in the recharge area of Houzhai underground river of Puding, Guizhou. Hydrogeochemistry characteristics of the spring, sulfur isotopic composition of SO^2-₄ and their seasonal changes were analyzed during a hydrological year, and the source and formation mechanism of sulfate in the spring were revealed. The results showed that the hydrochemical type of Dengzhanhe karst spring was HCO^-₃·SO^2-₄-Ca²⁺, the concentration of sulfate was very high and the range of variation was significant, the concentration of SO^2-₄ was 0.35-8.76 mmol·L^-1; the sulfur isotopic composition of SO^2-₄ in the spring was(3.80-25.76)×10^-3, and indicated that the sulfur isotopic composition was mainly controlled by dissolution of gypsum and oxidation of organic sulfur in soil; seasonal variation of sulfur isotopic composition was remarkable, and indicated that sulfur isotopic composition in dry season was more than that in rainy season, and the change of composition in dry season was small and mainly controlled by the dissolution of gypsum, but the change in rainy season was large and reflected the increase of organic sulfur for underground sulfate soil and its seasonal difference.

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Last Update: 2012-09-20