海洋沉积物中孔隙水的氯同位素测量方法研究

海洋沉积物中孔隙水的氯同位素测量方法研究

李艳平1,2,蒋少涌1,2,杨涛1,2,濮巍1,2

1.南京大学地球科学系内生金属矿床成矿机制研究国家重点实验室,南京210093；2.南京大学海洋地球化学研究中心,南京210093

收稿日期:2006-09-20 修回日期:2006-09-20 出版日期:2006-09-20 发布日期:2006-09-20

Analytical Method of Chlorine Isotopic Composition in the Marine Sediment Porewaters

LI Yan-ping1,2,JIANG Shao-yong1,2,YANG Tao1,2, PU Wei1,2

1. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China; 2. Center for Marine Geochemistry Research, Nanjing University, Nanjing 210093, China

Received:2006-09-20 Revised:2006-09-20 Online:2006-09-20 Published:2006-09-20

摘要/Abstract

摘要： 采用Ba型、H型和Cs型三步阳离子交换树脂法，对海洋沉积物中孔隙水的氯进行了分离和提纯。氯的回收率达99．6％，能满足氯同位素质谱测定的需要。氯同位素的测量采用基于Cs2Cl^＋离子的高精度正热电离质谱法，对ISL354NaCI标准物质的多次测量结果为”CI／”CI=0．319130±0．000029，对一个南海海底沉积物中孔隙水的多次测量结果为^37CI／^35CI=0．319144±0．000043，表明此方法的稳定性好，测量精度高，可用于海洋沉积物中孔隙水的氯同位素示踪研究

Abstract: A simple technique using three step cation-exchanges （Ba-type, H-type, and Cs-type）was used to enrich and purify CI from the sediment porewater samples. The recovery of CI is better than 99.6%. After purification, the ^37CI/^35CI ratios of porewater samples were measured using positive ion thermal ionization mass spectrometry based on the measurement of Cs2Cl^＋ ion with graphite load. The measured results for both the NaCI standard and one porewater sample show that the method has high stability and high precision （0.09 -0.13‰）. Initial results for porewater sampled from the South China Sea reveal significant -δ^37 Cl variation, and it may have great implications for further gas hydrate exploration in the area

李艳平,蒋少涌,杨涛,濮巍,. 海洋沉积物中孔隙水的氯同位素测量方法研究[J]. J4.

LI Yan-ping1,2,JIANG Shao-yong1,2,YANG Tao1,2, PU Wei1,2. Analytical Method of Chlorine Isotopic Composition in the Marine Sediment Porewaters[J]. J4.