湿碱消解-等离子体发射光谱法测定海洋沉积物中的生物硅  

Determination of Biogenic Opal in Marine Sediments by Inductively Coupled Plasma-Atomic Emission Spectrometry with Wet Alkaline Digestion

作　　者：熊志方[1,2] 路波[1,2] 于心科[1] 翟滨[1,2] 李铁刚[1] 

机构地区：[1]中国科学院海洋研究所海洋地质与环境重点实验室,山东青岛266071 [2]中国科学院研究生院,北京100049

出　　处：《岩矿测试》2010年第1期1-4,共4页Rock and Mineral Analysis

基　　金：国家重点基础研究发展计划(973)项目资助(2007CB815903);国家自然科学基金项目资助(40776031)

摘　　要：利用湿碱式化学提取技术和电感耦合等离子体发射光谱仪,优化样品碱式消解方法,确定仪器最佳工作条件,建立了测定海洋沉积物中不同含量级别生物硅的方法。结果表明,仪器检出限为0.724μmol/L,方法检出限为0.942μmol/L。用于测定硅酸盐-硅溶液成分分析国家一级标准物质(GBW08648和GBW 08649,标准值分别为50.0μmol/L和100.0μmol/L),测定值分别为(49.888±0.275)μmol/L、(99.578±0.651)μmol/L,相对标准偏差为0.443%、0.527%;对于不同生物硅含量级别海洋沉积物样品的平行、独立测量,其相对标准偏差<8.9%。方法快速、简便、准确,可满足古海洋学不同时空尺度气候和环境分析的应用。A method for the determination of biogenic opal with a wide content range in marine sediments using inductively coupled plasma-atomic emission spectrometry （ICP-AES） with wet alkaline digestion was reported in this paper. The chemical pretreatment procedure and instrument operation parameters for biogenic opal analysis were optimized. The detection limits of the instrument and method for biogenic opal were 0.724 μmol/L and 0.942 /μmol/L respectively. The method has been verified by analyzing the National Standard Reference Materials （NSRMs） of GBW 08648 and GBW 08649 and the analytical results of biogenic opal in these two NSRMs were in agreement with the certified values with precision of 0.443% RSD and 0.527% RSD respectively. The method has also been applied to the determination of biogenic opal in marine sediments with precision of less than 8.9% RSD and provides a simple, accurate and efficient means for biogenic opal measurement in climate and environment investigation with various temporal and spatial scales in paleoceanography.

关 键 词：生物硅 电感耦合等离子体发射光谱法 海洋沉积物 湿碱消解 

分 类 号：O657.31[理学—分析化学] P736.211[理学—化学]