摘要
稀土既是重要战略资源,也是地球化学演变过程重要的示踪元素。海水中的稀土元素含量极低,同时受限于其高盐基质影响,高效准确测定一直是具有挑战性的工作。本研究旨在通过一套在线除盐装置去除海水基质的背景干扰,同时对14种稀土元素进行富集之后,直接利用电感耦合等离子体质谱(ICP-MS)进行定量检测。通过空白样品分析,发现各稀土元素定量限在0.01~0.50 ng/L之间。14种稀土元素标曲线性系数r 2均大于0.999,相关性良好。样品pH梯度实验表明,当pH在2~6之间,测试结果准确度较好。对NASS-6标准海水样品稀土含量进行3次平行测试,各元素STD值在0.01~0.16之间;测定均值与文献报道值接近。加标回收实验显示各稀土元素回收率在94.81%~105.82%之间,进一步证明了该方法的准确度良好。测试大洋孔隙水样品稀土元素并绘制其配分曲线,曲线平滑度符合规律。海水中稀土元素含量既可用于指示海洋地球化学活动,也可用于污染物示踪,本研究探讨了快速在线富集检测海水稀土元素的方案,为后续相关研究的开展提供技术支撑。
Rare earth elements are not only important strategic resources,but also an indicator of the geochemical evolution process.The content of rare earth elements in seawater is very low.Due to the influence of high salt matrix,detecting the accurate concentration is s always difficulty.The purpose of this study is to remove the background interference of seawater matrix through an online desalination device,enrich rare earth elements and quantitatively detect 14 rare earth elements with inductively coupled plasma mass spectrometry(ICP-MS)technology.Tested with blank samples,it was found that the quantification limit for each rare earth element detection was between 0.01 and 0.50 ng/L.The linear evaluation of the standard curve shows that the linear coefficient r 2 of each element s standard curve is greater than 0.999.We analyzed the impact of different pH values on the detection of samples and found that the accuracy was better between pH 2 and 6.The parallelism and accuracy of the detection were evaluated by detection of NASS-6 standard seawater samples and comparison with the standard values.The STD values of the three tests were between 0.01 and 0.16,and the results were close to the perious researches.Experiment showed that the recovery rates of each element ranged from 94.81%to 105.82%demonstrating a good detection accuracy.Detected pore water samples and plotted rare earth element distribution curves verify that the curve smoothness was good proving that this method can be used for the real samples.In summary,this study can provide technical support the rapid online detection for rare earth elements in seawater.The content of rare earth elements in seawater can be used not only to indicate marine geochemical activities but also to trace pollutants.The discussion in this paper can providea technical support for further researchs.
作者
林梵宇
尹希杰
殷学博
刘建鑫
翁蓁洲
洪名钊
孙治雷
LIN Fanyu;YIN Xijie;YIN Xuebo;LIU Jianxin;WENG Zhenzhou;HONG Mingzhao;SUN Zhilei(Third Institute of Oceanography,MNR,Xiamen 361005,China;Institute of Oceanography,Chinese Academy of Sciences,Qingdao 266071,China;Fuzhou Marine and Fishery Technology Center,Fuzhou 350014,China;Guangzhou Prin-Cen Scientific Ltd,Guangzhou 510730,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China)
出处
《应用海洋学学报》
CAS
CSCD
北大核心
2024年第3期588-596,共9页
Journal of Applied Oceanography
基金
自然资源部第三海洋研究所基本科研业务费(海三科2024010)
国家自然科学基金(42176057,41976050)
崂山实验室科技创新项目课题(LSKJ202203504)。
