Determination of ultra-trace Pt, Pd and Rh in seawater using an off-line pre-concentration method and inductively coupled plasma mass spectrometry

Kai Liu; Xuelu Gao; Li Li; Chen-Tung Arthur Chen; Qianguo Xing

doi:10.1016/j.chemosphere.2018.08.098

Determination of ultra-trace Pt, Pd and Rh in seawater using an off-line pre-concentration method and inductively coupled plasma mass spectrometry

Chemosphere. 2018 Dec:212:429-437. doi: 10.1016/j.chemosphere.2018.08.098. Epub 2018 Aug 20.

Authors

Kai Liu¹, Xuelu Gao², Li Li³, Chen-Tung Arthur Chen⁴, Qianguo Xing⁵

Affiliations

¹ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
² CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address: xlgao@yic.ac.cn.
³ First Institute of Oceanography, State Oceanic Administration, Qingdao, Shandong, 266601, China.
⁴ Department of Oceanography, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.
⁵ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.

PMID: 30153615
DOI: 10.1016/j.chemosphere.2018.08.098

Abstract

A method was modified for the preconcentration of platinum (Pt), palladium (Pd) and rhodium (Rh) from seawater by a solid phase extraction using a commercially available resin Nobias-chelate PA1^®. All the determination was conducted using inductively coupled plasma mass spectrometry (ICP-MS) which had a low detection limit for Pt, Pd and Rh, about 16.53, 16.41 and 26.88 pg L^-1, respectively. It was found that the adsorption performance of the resin was closely related to the matrix, ligands and pH of the samples. Significant difference in recovery was found in various samples: seawater ≈ artificial seawater > ultra-pure deionized water. This method had low method blank in the range of 5.51-8.89 pg L^-1 and high enrichment factor of up to 180-200. The recoveries of Pt and Pd were 93 ± 4.2% in the spiked real seawater. However, the recovery of Rh on the resin was below 70% but stable in the range of 65-68%. It indicated that the Rh recovery seemed to be reproducible and higher volumes of seawater must be processed in order to obtain the lower limit of quantification and excellent recovery.

Keywords: Chelating resin; ICP-MS; Platinum group elements; Pre-concentration; Seawater.

MeSH terms

Limit of Detection
Mass Spectrometry / methods*
Palladium / analysis*
Palladium / isolation & purification
Platinum / analysis*
Platinum / isolation & purification
Rhodium / analysis*
Rhodium / isolation & purification
Seawater / analysis*
Seawater / chemistry
Solid Phase Extraction / methods*

Substances

Platinum
Palladium
Rhodium