Application of Online Enrichment and Purification Device to Detecting 10 Trace Elements in Seawater
[Objective]The aim of this paper is to establish a method for online enrichment and purification of heavy metal elements in seawater,to overcome the difficulty of quantitative detection of some trace elements in seawater because of high salt matrix in seawater.[Method]Enrichment of 10 trace elements,namely Mn,Fe,Co,Ni,Cu,Zn,Cd,Pb,V,and U,in a high salt matrix was achieved through adsorption using a chelating column based on polystyrene divinylbenzene (PS-DVB),one high molecular weight organic polymer.The trace element contents were detected by inductively coupled plasma mass spectrometry (ICP-MS),and the precision and accuracy of the method were evaluated.The influence of sample pH on detection was also explored.This method was used to detect trace elements in surface seawater samples from the Western Pacific and nearshore seawater samples from Xiamen,and the practical sample applicability of this method was evaluated.[Result]In the analysis process blank,each element was between 0.001-0.208 μg/L,the detection limit was between 0.002-0.211 μg/L,and the correlation coefficient r2 of each standard curve was greater than 0.999.The pH gradient experiments were conducted on seawater standard substance GBW-080040 and estuarine brackish water standard substance SLEW-3.When the sample pH was between 2-6,the accuracy of the test results was good,but alkaline samples were not suitable for direct testing.The precision of each element was evaluated through parallel experiments,and the standard substance SLEW-3 for estuarine brackish water ranged from 0.75％ to 5.98％,while the standard substance GBW-080040 for seawater ranged from 0.10％ to 0.94％.The relative error of SLEW-3 ranged from-7.46％ to 11.11％,and the spiked recovery rate ranged from 96.83％ to 105.17％,while the relative error of GBW-080040 ranged from,-3.98％ to 3.72％,and the spiked recovery rate ranged from 93.04％ to 101.10％.The spiked recovery rate of each element was found to be between 93.25％-111.62％ for deep-sea surface seawater samples and 95.89％-107.18％ for nearshore seawater samples in Xiamen.[Conclusion]This method is suitable for real-time online synchronous analysis of the 10 trace elements,i.e.Mn,Fe,Co,Ni,Cu,Zn,Cd,Pb,V and U,in high salt matrix samples.The stability,precision,and accuracy of the method are good,and it can be applied to the detection of actual seawater samples,providing technical support for the rapid detection of low content elements in complex matrix samples.
marine chemistryonline desalting deviceenrichment and purificationtrace elementsseawaterICP-MS
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