The Study on the Mechanism of Fluorine Transformation between Water and Rock (Soil) in Seawater Intrusion Areas Based on FTIR Spectrum
JIA Cui-ping1, CHEN Qiao2*, WEI Jiu-chuan2*, WANG Hong-mei3, SHI Long-qing2, NING Fang-zhu3, LIU Song-liang3, YANG Meng-yuan1, XUE Xin1, DONG Fang-ying2, JIA Zhi-wen2, JI Yu-han2
1. Science College, China University of Petroleum(East China), Qingdao 266580, China
2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3. The Third Exploration Team of Shandong Coalfield Geologic Bureau, Tai’an 271000, China
Abstract：Drinking-water fluorosis and seawater intrusion are common phenomena along coastal zones. The groundwater property variation evoked by seawater intrusion has the potential effect on fluorine transformation of rock (soil), but it lacks the direct simulation experiments, and the mechanism of fluorine transformation is still unclear. The static simulation experiments of fluorine transformation of sediments in the aquifers were performed by simulating the seawater intrusion process with the mixture of fresh water, seawater, brine water and laboratory solutions, and the FTIR spectrum of sediments was compared. By this way, the laws and mechanism of the effect of seawater intrusion on rock (soil) fluorine transformation are expected to be detected. The results are gained as follows: the orders of the fluorine transformation ability are: seawater＞1∶1 fresh water and seawater＞fresh water, and brine water＞1∶1 fresh water and brine water＞fresh water. The more fluorine in rock(soil) transforms with the more mixture of seawater or brine water. The sediments show higher ability of fluorine transformation with the higher levels of NaCl and NaHCO3, and with the lower levels of CaCl2. The intensity of Si—O—Si stretching vibration peak increases, that of bending vibration of fluorapatite decreases, and that of O—H adsorption peak doesn’t change with the higher levels of NaCl, but the opposite case occurs with the higher levels of NaHCO3, which indicates the fluorine migration mainly by the OH--F- exchange in NaHCO3 solution and instead by Si substitution of Si—O—Si bond in NaCl solution. The intensity of Si—O—Si stretching vibration peaks is weakened and that of fluorapatite bending vibration increases with the higher levels of CaCl2, indicating that Ca2+ can restrain the rock(soil) fluorine transformation. Meanwhile, the intensity of Si-F bending variation peak decreases and Si—O bending variation peak moves towards the low wavenumber with the increase of NaCl and NaHCO3 concentrations and the decrease of CaCl2 concentration. The 1 460 and 1 420 cm-1 CO2-3 absorption peaks occur when the sediment interacts with 1 mol·L-1 CaCl2 because of the CO2 mixture. The sediment has the higher intensity of 1 460 cm-1 absorption peak and the new 875 cm-1 absorption peak when interacting with 1 mol·L-1 NaHCO3. But the sediment has no CO2-3 absorption peaks when interacting with seawater, brine water and NaCl solution. These facts indicates no fluorite (CaF2) dissolution. Thus, the alkaline, high Na+ and low Ca2+ conditions due to seawater intrusion lead to the high fluorine-leaching ability of rock(soil), which should be the important dynamics of high-fluorine groundwater along coastal zones.
贾翠萍，陈 桥，魏久传，王红梅，施龙青，宁方助，刘松良，杨梦圆，薛 鑫，董方营，贾志文，季钰涵. FTIR光谱的海水入侵区水-岩（土）间氟迁移机理分析[J]. 光谱学与光谱分析, 2019, 39(04): 1036-1040.
JIA Cui-ping, CHEN Qiao, WEI Jiu-chuan, WANG Hong-mei, SHI Long-qing, NING Fang-zhu, LIU Song-liang, YANG Meng-yuan, XUE Xin, DONG Fang-ying, JIA Zhi-wen, JI Yu-han. The Study on the Mechanism of Fluorine Transformation between Water and Rock (Soil) in Seawater Intrusion Areas Based on FTIR Spectrum. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2019, 39(04): 1036-1040.
[1] LIU Jin-hua, WANG Yu-jun, YANG Jing-min, et al(刘金华, 王玉军, 杨靖民, 等). Soil(土壤), 2017, 49(3): 558.
[2] Chen Qiao, Song Zhaojun, Lu Qingshui，et al. Toxicological and Environmental Chemistry, 2012, 94(8): 1490.
[3] YU Li-ping, SUN Jing, CHEN A-li, et al(于丽萍, 孙 静, 陈阿丽, 等). Journal of Ningxia Medical University(宁夏医科大学学报), 2017, 39(3): 290.
[4] Wang Lifang, Chen Qiao, Long Xiaoping, et al. Water Science and Technology: Water Supply, 2015, 15(2): 384.
[5] Ma Fengshan, Wei Aihua, Deng Qinghai, et al. Journal of Earth Science, 2014, 25(6): 1067.
[6] Dou you, Howard Ken, Yang Liwei, et al. Exposure and Health, 2016, 8(3): 419.
[7] Xiao Yanfei, Liu Xiangsheng, Feng Zongyu, et al. Journal of Rare Earths, 2015, 33(5): 545.
[8] Chen Qiao, Lu Qingshui, Song Zhaojun, et al. Environmental Earth Sciences, 2014, 71: 4513.
[9] Liu Yizhang, Xiao Tangfu, Ning Zengping, et al. Applied Geochemistry, 2013, 37: 149.
[10] Yu Hao, Huang Xin, Ning Jianguo, et al. Soil and Foundations, 2014, 54(6): 1236.
[11] Li Haobo, Lü Yanxin, Wang Gang, et al. Disaster Advances, 2013, 6(2): 302.
[12] CHEN Lin, TANG Hong, LI Xiong-yao, et al(陈 林, 唐 红, 李雄耀, 等). Advances in Earth Science(地球科学进展), 2016, 31(4): 403.
[13] ZHANG Qin-hu, CHEN Nian-lai, WANG Hong-jie, et al(张勤虎, 陈年来, 王洪杰, 等). Industrial Water and Waste Water(工业用水与废水), 2015, 46(4): 23.
[14] XING Ying-ying(邢莹莹). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2017, 37(6): 1819.
[15] MAO Yong, LI Jian-chao, LI Qing, et al(毛 勇, 李剑超, 李 青, 等). Acta Materiae Compositae Sinica(复合材料学报), 2013, 30(5): 144.
[16] LI Xue-jun, WANG Li-juan, LU An-huai, et al(李学军, 王丽娟, 鲁安怀, 等). Acta Petrologica et Mineralogica(岩石矿物学杂志), 2003, 22(4): 386.
[17] Miller F A, Wilkins C H. Analytical Chemistry, 1952, 24(8): 1253.
[18] ZHU Qing-xia, HAN Dan, LI Ya-ming(朱庆霞, 韩 丹, 李亚明). Journal of the Chinese Cermamic Society(硅酸盐学报), 2016, 44(12): 1768.
[19] GUO Jin-yun, WANG Jian-bo, HU Zhi-bo, et al(郭金运，王建波，胡志博，等). Chinese Journal of Geophysics-Chinese Edition, 2015, 58(9): 3103.
