Determination of Iodine in Geochemical Samples by ICP-MS with Sodium Carbonate-Zinc Oxide Semi-melting

HE Xiuhui; TANG Shuaishuai; CHENG Jiang; SHI Youchang; LU Qianshu; WANG Yinjian; LAN Mingguo

doi:10.15898/j.cnki.11-2131/td.202106090074

Rock and Mineral Analysis > 2022 > 41(4): 606-613. > DOI: 10.15898/j.cnki.11-2131/td.202106090074

HE Xiuhui, TANG Shuaishuai, CHENG Jiang, SHI Youchang, LU Qianshu, WANG Yinjian, LAN Mingguo. Determination of Iodine in Geochemical Samples by ICP-MS with Sodium Carbonate-Zinc Oxide Semi-melting[J]. Rock and Mineral Analysis, 2022, 41(4): 606-613. DOI: 10.15898/j.cnki.11-2131/td.202106090074

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Determination of Iodine in Geochemical Samples by ICP-MS with Sodium Carbonate-Zinc Oxide Semi-melting

1.
Kunming Center of Natural Resources Comprehensive Survey, China Geological Survey, Kunming 650100, China
2.
Chengdu Center, China Geological Survey, Chengdu 610081, China

More Information

Received Date: June 08, 2021
Revised Date: July 27, 2021
Accepted Date: November 04, 2021
Available Online: September 08, 2022

Abstract

HIGHLIGHTS
(1) The semi-melting method of sodium carbonate-zinc oxide was used to treat the sample, which solved the problem of incomplete melting caused by the polyvalent state coexistence of iodine in the sample.

(2) By optimizing the analytical medium and internal standard elements, the problem of poor stability and accuracy of sample determination by ICP-MS was solved.

(3) The method has high efficiency and reliable results, which is suitable for the analysis of geochemical survey samples.

ABSTRACT

BACKGROUND
The determination of iodine in geochemical samples by inductively coupled plasma-mass spectrometry (ICP-MS) is treated mainly by closed sample melting, mixed acid solution, alkali fusion and semi-melting method. However, due to the complex existent morphology of iodine in soil and sediment samples, including periodate, iodate and iodide ions, and the first ionization energy of iodine being high as a halogen group element, there are problems such as incomplete dissolution, strong memory effect and poor precision during sample processing and measurement.
OBJECTIVES
To improve the determination of iodine in geochemical samples by ICP-MS.
METHODS
The samples were treated by sodium carbonate-zinc oxide semi-melting method, extracted with boiling water-ethanol, and separated by 732 cation exchange resin. Following this, iodine in the solution was determined by ICP-MS using an internal standard method.
RESULTS
The optimized detection limit of iodine was 0.045μg/g, the lower limit of detection was 0.15μg/g. The precision (RSD, n=12) and the accuracy (△logC) of the method were ≤5.93% and ≤0.01, respectively, which satisfied the analysis standards of geochemical survey sample.
CONCLUSIONS
This method meets the requirements of sample analysis for geochemical investigation, and can be used for the analysis of iodine in large quantities of soil and sediment samples.
- inductively coupled plasma-mass spectrometry,
- geochemical sample,
- Na₂CO₃-ZnO,
- cation exchange resin,
- iodine

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References

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Determination of Iodine in Geochemical Samples by ICP-MS with Sodium Carbonate-Zinc Oxide Semi-melting

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