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Method for detecting zircon hafnium isotopes

A detection method and isotope technology, applied in material excitation analysis, thermal excitation analysis, etc., can solve problems affecting the accuracy of hafnium isotope ratio, difficult to obtain hafnium isotope ratio, interference, etc.

Active Publication Date: 2020-12-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are still very small amounts of rare earth elements in the purified zircon sample solution, such as gadolinium (Gd) and dysprosium (Dy), their oxides 160 Gd 16 O and 160 Dy 16 The O ion signal will interfere with 176 Hf ion signal, which affects the accuracy of the final hafnium isotope ratio
[0005] At present, relatively accurate hafnium isotope ratios can only be obtained by repeatedly adjusting parameters such as the sample gas flow rate and torch position of the inductively coupled plasma mass spectrometer based on experience, and it is difficult to obtain absolutely accurate hafnium isotope ratios

Method used

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  • Method for detecting zircon hafnium isotopes
  • Method for detecting zircon hafnium isotopes
  • Method for detecting zircon hafnium isotopes

Examples

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Embodiment 1

[0047] (1) Using a nebulizer to introduce a hafnium standard solution into the plasma ion source of a multi-receiver inductively coupled plasma mass spectrometer for ionization, thereby obtaining hafnium isotope and hafnium oxide ions.

[0048] (2) Hafnium isotope ions and hafnium oxide ions pass through the electric field and magnetic field in the mass spectrometer to achieve double focusing of energy and position;

[0049] (3) Use Faraday cups L4, L3, L2, Center Cup, H1, H2, H3 and H4 to receive simultaneously 172 Yb, 173 Yb, 175 Lu, 176 Hf, 177 Hf, 178 Hf, 179 Hf and 177 f 16 O ion flow. Obtaining Hafnium Isotope Ratio Values 176 Hf / 177 Hf=0.282224±0.000014, hafnium oxide yield 177 f 16 O / 177 Hf = 15.58%.

[0050] (4) Judging whether the obtained hafnium isotope ratio is correct. acquired 176 Hf / 177 Hf = 0.282224±0.000014 deviates from the recommended value.

[0051] (5) Adjust the auxiliary gas flow rate of the mass spectrometer to 1.3 L / min.

[0052]...

Embodiment 2

[0061] Mass spectrometer parameters auxiliary gas flow rate and hafnium oxide yield ( 177 f 16 O / 177 Hf), mass spectrometer parameters auxiliary gas flow rate and hafnium isotope ratio ( 176 Hf / 177 Hf) relationship experiment.

[0062] In this experiment, the flow rate of the auxiliary gas was reduced from 1.4 liters / minute to 0.1 liters / minute in steps of 0.1 liters / minute. Under different flow rates of the auxiliary gas, the measured hafnium oxide yield results can be found in figure 2 ,Depend on figure 2 It can be seen that the two present a significant exponential relationship, and the correlation coefficient reaches 0.9714. With the decrease of the auxiliary gas flow rate, the hafnium oxide yield ( 177 f 16 O / 177 Hf) index decreased.

[0063] The flow rate of the auxiliary gas is reduced from 1.4 liters / minute to 0.1 liters / minute with a step size of 0.1 liters / minute. Under different flow rates of the auxiliary gas, the measured hafnium isotope ratio ( 176...

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Abstract

The invention provides a zircon hafnium isotope detection method, which can detect ion signals of hafnium oxide while testing the zircon hafnium isotope ratio, and can reduce the oxide yield by monitoring the oxide yield and adjusting mass spectrometer parameters according to the obtained oxide yield value, and reduces the yield of oxide, so that an accurate hafnium isotope ratio result can be obtained.

Description

technical field [0001] The invention relates to the technical field of isotope geochemistry, in particular to a method for detecting zircon hafnium isotopes. Background technique [0002] Zircon is a common accessory mineral in various genetic rocks in nature. It has a high content of uranium (U), lead (Pb) and hafnium (Hf), making it an important component not only in U-Pb isotope geochronology. It is also the ideal mineral for Hf isotope analysis, and gradually formed a branch of zirconology with extremely broad application prospects. In particular, the combination of zircon U-Pb ages, trace elements, Hf, and O isotopes provides important geochemical parameters for studying the migration and evolution of the Earth in space over time. [0003] With the development of inductively coupled plasma mass spectrometer (ICP-MS) technology, especially the multi-receiver-inductively coupled plasma mass spectrometer (MC-ICP-MS) with high accuracy, high sensitivity, high efficiency an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 黄超
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI