The solubility of ErPO4 and Er speciation in hydrothermal fluids at varying pH and salinity between 350 and 450 °C

Key Points

• The solubility of ErPO4 changes significantly with variations in pH and salinity at temperatures between 350 and 450 °C.
• Notably, increased pH leads to altered speciation of Er in hydrothermal fluids, affecting its chemical behavior.
• Analysis of hydrothermal fluids suggests that temperature also plays a critical role in ErPO4 solubility and speciation.
• These findings highlight the importance of environmental factors in the behavior of rare earth elements in geochemical processes.