Determination of Thorium and Potassium Oxide in Geological Samples by Inductively Coupled Plasma-Optical Emission Spectrometry

QIN Xiao-li; TIAN Gui; LI Chao-chang; JIANG Zhi-lin

doi:10.15898/j.cnki.11-2131/td.201812290142

Rock and Mineral Analysis > 2019 > 38(6): 741-746. > DOI: 10.15898/j.cnki.11-2131/td.201812290142

QIN Xiao-li, TIAN Gui, LI Chao-chang, JIANG Zhi-lin. Determination of Thorium and Potassium Oxide in Geological Samples by Inductively Coupled Plasma-Optical Emission Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(6): 741-746. DOI: 10.15898/j.cnki.11-2131/td.201812290142

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Determination of Thorium and Potassium Oxide in Geological Samples by Inductively Coupled Plasma-Optical Emission Spectrometry

Anhui Nuclear Exploration Technology Central Institute, Wuhu 241000, China

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Received Date: December 28, 2018
Revised Date: April 11, 2019
Accepted Date: July 15, 2019
Published Date: October 31, 2019

Abstract

HIGHLIGHTS
(1) The limitation of traditional analytical methods for thorium and potassium in geological samples was the low efficiency resulting from independent measurement for the two elements.

(2) The sample was dissolved by nitric acid-hydrofluoric acid-perchloric acid, which provided the condition for the simultaneous determination of multiple elements.

(3) The thorium and potassium oxide in geological samples were simultaneously determined by ICP-OES with radial observation mode.

ABSTRACT

BACKGROUNDSimultaneous determination of thorium and potassium in geological samples can provide an important basis for exploration of radioactive mineral resources and evaluation of the natural radioactive ecological environment. The thorium in geological samples is usually digested by alkali fusion in traditional methods and determined by spectrophotometry. The traditional method is long, complex and not suitable for simultaneous determination of multiple elements. The potassium oxide in geological samples is digested by acid and generally determined by flame atomic absorption spectrometry, which requires diluting the solution with high concentration and has low detection efficiency. The determination of thorium and potassium oxide involves two different analytical methods and analytical instruments.
OBJECTIVESTo establish an analytical method for simultaneous determination of thorium and potassium oxide in geological samples.
METHODSChemical solvent which consists of nitric acid, hydrofluoric acid and perchloric acid, was identified according to the characteristics of the chemical composition of the geological samples. The geological samples were dissolved with this solvent and extracted with nitric acid. The content of thorium and potassium oxide in geological samples was measured by inductively coupled plasma-optical emission spectrometry (ICP-OES) at wavelengths of 401.913nm and 766.490nm, respectively by radial observation mode.
RESULTSThe correlation coefficient of the calibration curve of thorium and potassium oxide was greater than 0.999 and the detection limit of this method was 0.69μg/g and 0.008%, respectively. The measured value of the standard substance was consistent with the identified value, and the absolute logarithmic error of the two values was less than 0.1. The relative standard deviation was less than 6.0% and the recovery ranged from 96.0% to 104.0%.
CONCLUSIONSThis method meets the requirements of the testing quality management standard for geological and mineral laboratories.
- geological samples,
- thorium,
- potassium oxide,
- acid dissolution,
- inductively coupled plasma-optical emission spectrometry,
- radial observation

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Determination of Thorium and Potassium Oxide in Geological Samples by Inductively Coupled Plasma-Optical Emission Spectrometry

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