References:
     [1] Qu, Y. X., Fu, Y. J. Advances in chemical constituents, quality control and pharmacological effects of asini corii colla [J]. Special Wild Economic Animal and Plant Research, 2023, 45(3): 136-143.
     [2] Liu, G. S. Ejiao and Ejiao culture [C]. Proceedings of the 12th National Symposium on Traditional Chinese Medicine Culture, 2009.
     [3] Yang, F. A. Research and development prospects of Ejiao [C]. Proceedings of the First National Symposium on Paste Theory and Clinical Application, 2009.
     [4] Ge, C. Y., Pang, H., Li, N., et al. Content analysis and comparative study of amino acids in Ejiao from 18 manufacturers [J]. China Pharmacy, 2017, 28(1): 122-126.
     [5] Fu, X. F., Yang, X. M., Gao, X. B. Relationship between water used in Ejiao and gel quality [J]. Studies of Trace Elements and Health, 2018, 35(6): 38-40.
     [6] Wang, B., Wang, H., You, H. L. Study on quality standard of Shandong Ejiao paste [J]. Drug Standards of China, 2012, 13(5): 366-369.
     [7] Che, F. G., Li, D. S. Clinical application and pharmacological research of traditional Chinese medicine Ejiao [J]. Inner Mongolia Journal of Traditional Chinese Medicine, 2018, 37(10): 96-98.
     [8] Huang, H., Liang, X. J., Xiao, X., et al. Groundwater quality evaluation model based on rough set and support vector machine [J]. China Environmental Science, 2016, 36(2): 619-625.
     [9] Liu, M. K., Tong, J., Hu, B., et al. Spatiotemporal distribution characteristics of inflow and water quality changes in Jinze Reservoir [J]. Environmental Science, 2019, 40(10): 4461-4468.
     [10] Liu, Y. L., Zheng, Y. A. Water quality assessment and spatiotemporal variation analysis of the mainstream of the Yellow River [J]. Environmental Science, 2022, 43(3): 1332-1345.
     [11] Zhang, Z. X., Ma, C. M., Zhang, D., et al. Integrating the impact of large-scale hydraulic engineering with a sustainable groundwater development strategy: a case study of Zhengzhou city, China [J]. Science of the Total Environment, 2022, 838: 156579.
     [12] Zhang, Q. Y., Xu, P. P., Chen, J., et al. Evaluation of groundwater quality using an integrated approach of set pair analysis and variable fuzzy improved model with binary semantic analysis: a case study in Jiaokou irrigation district, east of Guanzhong basin, China [J]. Science of the Total Environment, 2021, 767: 145247.
     [13] Das, B., Pal, S. C., et al. Assessment of groundwater vulnerability to over-exploitation using MCDA, AHP, fuzzy logic and novel ensemble models: a case study of Goghat-I and II blocks of west Bengal, India [J]. Environmental Earth Sciences, 2020, 79: 8843.
     [14] Wu, C., Feng, C., Wu, X., et al. Hydrogeochemical characterization and quality assessment of groundwater using self-organizing maps in the Hangjinqi gasfield area, Ordos basin, NW China [J]. Geoscience Frontiers, 2021, 12(2): 781-790.
     [15] Uddin, M. G., Nash, S., Olbert, A. I., et al. A review of water quality index models and their use for assessing surface water quality [J]. Ecological Indicators, 2021, 122: 107218.
     [16] Noori, R., Berndtsson, R., Hosseinzadeh, M., et al. A critical review on the application of the National Sanitation Foundation Water Quality Index [J]. Environmental Pollution, 2019, 244: 575-587.
     [17] Uddin, M. G., Nash, S., Rahma, A., et al. A comprehensive method for improvement of water quality index (WQI) models for coastal water quality assessment [J]. Water Research, 2022, 219: 118532.
     [18] Liu, Z. Q., Qiu, F. G., Li, H. Y., et al. Evaluations of rural drinking water quality and health risk in the North China Plain [J]. Environmental Chemistry, 2021, 40(7): 2054-2063.
     [19] Sutadian, A. D., Muttil, N., Yilmaz, A. G., et al. Development of river water quality indices—a review [J]. Environmental Monitoring and Assessment, 2016, 188(1): 58.
     [20] Li, Z., Yang, T., Huang, C. S., et al. An improved approach for water quality evaluation: TOPSIS-based informative weighting and ranking (TIWR) approach [J]. Ecological Indicators, 2018, 89: 356-364.
     [21] Li, P. Y., Wu, J. H., Qian, H. Groundwater quality assessment based on entropy weighted osculating value method [J]. International Journal on Environmental Sciences, 2010, 1: 621-630.