海洋科学Issue(3)：6-10,5.
国产沸石的改性处理及其在海水硝酸盐氮同位素预处理中的应用
The modification of Chinese natural zeolites and their appli-cation in nitrogen isotope analysis of nitrate in seawater
摘要
Abstract
Several Chinese natural zeolites were modified with multiple methods to increase their ammonium ad-sorption efficiency for nitrogen isotope analyses. The absorption efficiency of zeolites could be increased 16%and 80% after gravity selection and sodium-involved chemical modification respectively. Micro-wave and ultrasound treatments both further increased the ammonium adsorption efficiency. With our modifications, the adsorption effi-ciency for low-concentration ammonium reached 90%or higher under acidic environments. Nitrogen isotope frac-tionation factors of the modified Chinese zeolites were lower and more homogeneous than those of UOP zeolite. Consequently, the modified Chinese zeolites are ideal tools for nitrogen isotope analysis of nitrate in seawater. The modified Chinese zeolites have been applied to analyze water samples collected from the Changjiang River estuary. The analytical results indicated that they are suitable forδ15N analysis of dissolved nitrate in seawaters. Meanwhile, they could provide valuable information about the sources and cycle mechanism of dissolved nitrogen in estuary waters.关键词
改性沸石/低浓度铵氮/氮同位素/分馏Key words
modified zeolite/low-concentration ammonium/nitrogen isotope/fractionation分类
海洋科学引用本文复制引用
于海燕,俞志明,宋秀贤,袁涌铨,曹西华..国产沸石的改性处理及其在海水硝酸盐氮同位素预处理中的应用[J].海洋科学,2013,(3):6-10,5.基金项目
国家自然科学基金项目(41276116) （41276116）
国家基金委创新研究群体科学基金资助项目(41121064) （41121064）
国家基础研究规划973项目(2010CB428706)。 （2010CB428706）
