Determination of Cu and Zn isotopes in sediments by multi-collector inductively coupled plasma mass spectrometer

He Lianhua; Liu Jihua; Zhang Ying; Gao Jingjing; Zhu Aimei; Wang Hongmin

doi:10.12284/hyxb2022009

Volume 44 Issue 3

Mar. 2022

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He Lianhua，Liu Jihua，Zhang Ying , et al. Determination of Cu and Zn isotopes in sediments by multi-collector inductively coupled plasma mass spectrometer[J]. Haiyang Xuebao，2022, 44(3)：70–80 doi: 10.12284/hyxb2022009

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Determination of Cu and Zn isotopes in sediments by multi-collector inductively coupled plasma mass spectrometer

doi: 10.12284/hyxb2022009

He Lianhua^{1, 2, 3
,},
Liu Jihua^{1, 2, 3
,
,},
Zhang Ying^{1, 2, 3},
Gao Jingjing^{1, 2, 3},
Zhu Aimei^{1, 2, 3},
Wang Hongmin^{1, 2, 3}

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Key Laboratory of Marine Geology and Metallogeny, Ministry of Natural Resources, Qingdao 266061, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China

Received Date: 2021-01-08
Rev Recd Date: 2021-06-04
Publish Date: 2022-03-18

Abstract

Abstract

We presented an optimized and purification procedure as well as an analytical method for Cu and Zn isotopes measurement in marine sediments. We reported Cu and Zn isotope of 5 samples in a sediment cores and 20 surface sediment samples in the northern and southern Okinawa Trough. Anion exchange resin (AG MP-1M) was applied to separate matrix elements of sediment samples from Cu, Fe and Zn using 8.2 mol/L HCl+0.01% HF+0.001% H₂O₂, 2 mol/L HCl+0.001% H₂O₂ and 0.5 mol/L HNO₃ as eluents. The recoveries of Cu and Zn were both close to 100%. Cu and Zn isotopes were measured on a Nu Plasma multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS). Instrumental mass bias was corrected using a combination of sample-standard bracketing and internal spiking. The long-term reproducibilities were 0.11‰ (2SD) for Cu isotopes and 0.09‰ (2SD) for Zn isotopes. The δ⁶⁶Zn of surface sediments varies from 0.07‰ to 0.67‰, with an average of 0.31‰ ± 0.32‰ (2SD); the δ⁶⁵Cu of surface sediments ranges from −2.26‰ to −0.52‰, with an average of −1.21‰ ± 0.55‰ (2SD). The results show that Cu and Zn isotopes of surface sediments in the Okinawa Trough varies widely, meanwhile, Cu and Zn isotopes in sediment core varies with depth.
- Cu isotopes,
- Zn isotopes,
- multi-collector inductively coupled plasma mass spectrometer,
- marine sediments,
- Okinawa Trough

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References(54)

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