岩矿测试2023，Vol.42Issue(6)：1156-1164,9.DOI:10.15898/j.ykcs.202303130034
西藏地区羊八井地热水中胶体粒子分析与表征
Analysis and Characterization of Colloidal Particles in Yangbajing Geothermal Water,Tibet
摘要
Abstract
BACKGROUND:The hydrochemical characteristics of geothermal water include various information such as geological,structural,fracture,alteration,and environmental changes during its formation.It is particularly important to analyse various components in geothermal water accurately. Tibet is rich in geothermal resources,and some geothermal water contains colloidal particles.It is of great significance to study the morphology,composition and structure of colloidal particles for understanding the relationship between the material sources of geothermal fluids and colloidal particles.The generation and precipitation of colloidal particles can affect the turbidity,conductivity,and partial cation content of geothermal water.It is not easy to obtain naturally formed colloidal particles in geothermal water,so there are few reports on the analysis of colloidal particles in geothermal water. OBJECTIVES:To analyze colloidal particles in geothermal water accurately by multiple methods,and understand the relationship between colloidal particles and opals,and the impact of colloidal particles on the analysis of other elements in geothermal water. METHODS:By comparing the changes in the main components of the water samples before and after filtration,the composition of colloidal particles was inferred.The composition and structure of colloidal particles in the filtrate were characterized by scanning electron microscopy(SEM)and other instruments.The particle size of colloidal particles in geothermal water was measured by laser particle size analyzer,the morphology of colloidal particles was characterized by transmission electron microscope(TEM)and SEM,the characteristic spectrum peak of colloidal particles was measured by Fourier transform infrared spectroscopy(FTIR),the main composition of colloidal particles was analyzed by energy dispersive spectrometer(EDS),and the content of silicon in geothermal water was determined by inductively coupled plasma-optical emission spectrometry(ICP-OES)and ultraviolet-visible spectrophotometry(UV-Vis). RESULTS:The colloidal particles in geothermal water are colloidal silica particles.High levels of silica in geothermal water are present in the form of soluble silicic acid and colloidal particles.The average particle size of the colloidal particles is 80.83nm,which is related to the formation of cesium silica and the enrichment of light rare earth elements.The colloidal particle can be analyzed by ICP-OES method,but cannot show color with ammonium molybdate,resulting in a significant difference in the results of using UV-Vis and ICP-OES to determine silicon in this type of water.ICP-OES is a more suitable detection method for geothermal water with high silicon dioxide content.Silicon dioxide can be directly measured whether it exists in the form of metasilicic acid or colloidal particles. CONCLUSIONS:The research shows that the presence of colloidal particles increases the turbidity,but not the conductivity,of geothermal water.The results show that the high content of SiO2 in geothermal water co-exists in the form of metasilicate and colloidal particles,which can be analyzed by ICP-OES but cannot show color with ammonium molybdate.The content of SiO2 colloidal particles in geothermal water can be obtained by calculating the difference between SiO2 measured by ICP-OES and H2SiO3 measured by UV-Vis.SiO2 colloidal particles are relatively stable and not easy to precipitate.SiO2 colloidal particles will adsorb metal ions in geothermal water during the filtration process.关键词
地热水/二氧化硅/偏硅酸/胶体粒子/能谱-扫描电镜/电感耦合等离子体发射光谱法Key words
geothermal water/SiO2/metasilicic acid/colloidal particles/energy spectrum-scanning electron microscopy/inductively coupled plasma-optical emission spectrometry分类
天文与地球科学引用本文复制引用
刘高令,姜贞贞,刘高博,邬国栋,苏思强,周会东,卓玛曲西,胡亚燕,李明礼..西藏地区羊八井地热水中胶体粒子分析与表征[J].岩矿测试,2023,42(6):1156-1164,9.基金项目
西藏自治区自然科学基金(XZ202001ZR0027G) （XZ202001ZR0027G）
西藏自治区中央引导地方项目(XZ202201YD0030C,XZ202102YD0024C) （XZ202201YD0030C,XZ202102YD0024C）
