摘要
Revelle因子不仅能反映弱碱性水体对吸收大气CO_(2)的缓冲能力,还能体现水体酸化过程中CO_(2)去气对H^(+)的缓冲作用。本研究通过对多个缓冲因子的分析,探讨喀斯特中高硫煤矿区地表水碳酸盐系统对酸性矿山废水的缓冲作用,有助于进一步理解喀斯特地区流域水体中DIC循环过程和CO_(2)源汇关系特征。结果表明,地表水碳酸盐系统内车田河流域Revelle因子变化区间在1.00~51.96之间,能有效揭示地表水碳酸盐系统内CO_(2)去气对H^(+)的缓冲过程,其敏感区间为pH=7.0~8.38的弱碱性水体。γDIC、βDIC、ωDIC、γAlk、βAlk、ωAlk等缓冲因子是基于pH和DIC浓度的二元方程。这些因子进一步细化了CO_(2)(aq)、H^(+)和CO_(3)^(2-)等组分对DIC浓度和碱度的相对变化关系。在pH>7.0的DIC碳酸盐体系内,6个缓冲因子对水体酸化过程中碳酸盐组分的动态转化具有很好的响应。当pH<7.0以后,水−气界面和水−岩界面的碳传输过程增强,当CO_(2)去气过程占主导,则缓冲因子绝对值变大;当H^(+)对碳酸盐岩溶蚀过程占主导,则缓冲因子绝对值变小。
The dynamic changes of different components in water carbonate system(CO_(2)+HCO[Math Processing Error]+CO[Math Processing Error])can be characterized by Revelle factor which can not only reflect the buffering capacity of weak-basicity water to absorb atmospheric CO_(2),but also reflect the buffering effect of CO_(2) degassing on H^(+)during water acidification.Compared with the marine system,the Revelle factor in the surface water carbonate system has a larger variation range.However,the study on the variation of buffering factors in the dynamic transformation of carbonate components in freshwater system is still very limited.This study selected the Chetian river located in Eastern Jinsha county,Guizhou Province as the research area.Through the analysis of multiple buffering factors,the buffering effect of the surface water carbonate system on AMD input was discussed.The results will help to further understand the DIC cycle process and the CO_(2) source-sink relationship in surface water in the karst area of medium-high sulfur coal mine.Based on the 13-month sampling analysis from November 2020 to November 2021,the equations of Revelle factor—γDIC,βDIC,ωDIC,γAlk,βAlk andωAlk—were established to characterize the relationship between acid-base chemical balance of water and the dynamic variation of carbonate components.Results show that when the Revelle factor is at the maximum,the buffering capacity of the water carbonate system is the weakest.In the marine system,the maximum value of Revelle factor appears at pH 7.50,and the seawater sample data are mainly distributed on the right side of this factor,reflecting the absorption and buffering capacity of the ocean to atmospheric CO_(2).When the pH is in the range of 6.35-8.38,the carbonate balance in surface water mainly reflects the conversion between CO_(2)(aq)and HCO[Math Processing Error],and CO[Math Processing Error]−is almost negligible.Due to the influence of AMD input,all data in the Chetian river fall on the left side of the maximum value,with a
作者
黄江浔
李清光
安丽
杜双雪
郭兴强
HUANG Jiangxun;LI Qingguang;AN Li;DU Shuangxue;GUO Xingqiang(Key Laboratory of Karst Geological Resources and Environment of Ministry of Education,College of Resources and Environmental Engineering,Guizhou University,Guiyang,Guizhou 550025,China;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou 550081,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2023年第1期19-28,共10页
Carsologica Sinica
基金
国家自然科学基金项目(41867050)
国家重点研发计划(2019YFC1805300)
贵州省基础研究计划([2019]1096)
贵州省人才基地项目(RCJD2018-21)。
