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A Microfluidic Chip for ICPMS Sample Introduction
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Natural rock-derived microfluidic chip for probing multicomponent mineral dissolution dynamics.

Yingxue Hu1, Haozhou Wang1, Wei Xu1

  • 1School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China. sujunwei@xjtu.edu.cn.

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|November 12, 2025
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Summary

Mineral dissolution in rocks is complex. This study uses microfluidic chips to show how mineral composition, like calcite and dolomite, controls dissolution patterns and rates in subsurface processes.

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Area of Science:

  • Geochemistry
  • Geology
  • Materials Science

Background:

  • Mineral dissolution is crucial for subsurface processes, involving fluid flow, mass transport, and geochemical reactions.
  • Understanding dissolution dynamics is key for subsurface engineering applications.

Purpose of the Study:

  • To develop and utilize microfluidic chips for visualizing and analyzing mineral dissolution in natural rocks.
  • To investigate the influence of mineral composition and heterogeneity on dissolution patterns and rates.

Main Methods:

  • Fabrication of optically transparent microfluidic chips from natural carbonate rocks using laser micromachining.
  • Real-time, high-resolution visualization of dissolution dynamics in calcite, mixed-mineral, dolomite, and multi-mineral rocks.
  • Micro-mechanistic analysis to understand the impact of mineralogy on fluid transport and reaction suppression.

Main Results:

  • Calcite rocks show wormhole dissolution, while dolomite rocks exhibit compact patterns.
  • In mixed carbonate rocks, dolomite dominates dissolution dynamics, suppressing reaction rates due to pore structure changes.
  • Multi-mineral rocks with inert components form stable layers at the reaction front, limiting observable changes.

Conclusions:

  • Mineral composition and heterogeneity significantly control rock dissolution behavior.
  • The developed microfluidic platform offers a versatile tool for studying fluid-rock interactions.
  • Findings provide critical insights into subsurface processes influenced by mineral dissolution.