可溶性铝的检测方法及其在气溶胶研究中的应用

Dissolved Aluminum Measurement Methods and Their Application in Atmospheric Aerosol Research

沙尘气溶胶沉降是开放大洋表层海水关键营养元素的重要来源,对海洋生物地球化学循环和初级生产力具有重要影响。铝作为沙尘的示踪元素,可用于定量估算沙尘气溶胶的海洋沉降通量;使用该方法计算沙尘沉降通量,关键在于准确获取表层海水和大气颗粒物中可溶性铝的浓度。本文归纳总结了海水和气溶胶中可溶性铝常用的分离提取步骤、定量检测方法,讨论了各方法的原理、优缺点及适用性;指出气溶胶铝可溶性的不确定性是制约准确估算沙尘海洋沉降通量的瓶颈,分析了气溶胶铝可溶性不确定性的主要原因;并对可溶性铝分析检测和气溶胶铝可溶性研究的未来方向进行展望。

Atmospheric deposition of desert dust aerosol is a major source of key nutrients for surface seawater in open oceans,significantly impacting marine biogeochemistry and primary productivity.As a tracer for desert dust aerosol,aluminum(Al)is widely used to estimate deposition fluxes of desert dust aerosol into the oceans,and dissolved Al concentrations in surface seawater and aerosol particles are key parameters for using this method to estimate desert dust deposition fluxes into the oceans.In this paper,we first review separation,extraction and detection methods used to measure dissolved Al in seawater and aerosol samples,and discuss their principles,advantages,limitations and applicability.After advances in aerosol Al solubility are systematically reviewed,we point out that the uncertainties in aerosol Al solubility are the bottleneck which currently limits accurate estimations of desert dust deposition fluxes into the oceans,and further analyze the sources of these uncertainties.In the final,we also outline research directions for dissolved Al analysis and aerosol Al solubility research.