摘要
目前衡量古海洋生产力的指标都存在一定的局限性,本文提出将溴元素作为研究古海洋生产力的新指标,建立了海相碳酸盐岩的分解方法以及其中溴元素的测定方法,即热水解-分光光度法。采用热水解方法对海相碳酸盐岩样品进行分解,吸收液充分吸收其释放出的溴,分光光度法检测样品中溴元素的含量。试验确定了热水解的最佳条件和分光光度检测的最佳波长,实际样品加标回收率为97.5%～101.6%,相对标准偏差为1.2%～3.6%(n=10)。本方法的样品分解时间较短,能很好地实现溴与基体组分分离,且所需仪器均为比较常见的仪器,操作简单,成本低廉,适合于海相碳酸盐岩样品的批量分解和元素测定。
It is very important to research the primary productive forces of the ancient sea in order to attempt to find a solution for the current energy and climate problems. At present, all of the proxies to estimate the primary productive forces of the sea have certain limitations. In this paper, a new proxy of Br is introduced and the description of establishing a new method for Pyrohydrolysis-Catalytie Spectrophotometry to digest marine carbonate rock and determine Br. The Permian marine carbonate rocks were decomposed by pyrohydrolysis, the Br was trapped by NaOH solution （0. 1% ） and measured by Catalytic Spectrophotometry. The optimal experimental conditions for pyrohydrolysis and the optimal wave length for Catalytic Spectrophotometry are described. The recovery rates were in the range of 97.5% - 101.6% with RSD （n = 10） from 1.2% to 3.6%. This experimental technique is highly suitable for marine carbonate rock samples due to its use of commonly available equipment, simple operation, short operational process and low cost.
出处
《岩矿测试》
CAS
CSCD
北大核心
2013年第2期258-262,共5页
Rock and Mineral Analysis
关键词
海相碳酸盐
溴
热水解
催化分光光度法
marine carbonate rocks
bromine
pyrohydrolysis
Catalytic Spectrophotometry
