9[1]Tucker L R, Lewis C. The reliability coefficient for maximum likelihood factor analysis. Psychometrika, 1973, 38: 1~10
10[2]Steiger J H, Lind J M. Statistically-based tests for the number of common factors. Paper presented at the Psychometrika Society Meeting, IowaCity, May, 1980
4JIN Zanfang, PAN Zhiyan, JIN Mantong, et al. Determination of nitrate contamination sources using isotopic and chemical in dicators in an agricultural region in China [ J ]. Agriculture, Ecosystems & Environment ,2012,155 ( 13 ) :78-86.
5GU Baojing, GE Ying, CHANG S X, et al. Nitrate in groundwater of China: sources and driving forces [ J ]. Global Environmental Change,2013,23(5) :1112-1121.
6ZHANG Yan, LI Fadong, ZHANG Qiuying, et al. Tracing nitrate pollution sources and transformation in surface-and ground-waters using environmental isotopes [ J ]. Science of the Total Environment,2014,490(15) :213-222.
7HU Kelin, HUANG Yuangfang, LI Hong,et al. Spatial variability of shallow groundwater level, electrical conductivity and nitrate concentration, and risk assessment of nitrate contamination in North China Plain [ J ]. Environment International, 2005,31 ( 6 ) : 896- 903.
8HUANG Haimig, XIAO Xianming, YAN Bao, et al. Ammonium removal from aqueous solutions by using natural Chinese (Chende) zeolite as adsorbent [ J ]. Journal of Hazardous Materials, 2010,175 (1/2/3) :247-252.
9HALIM A A,AZIZ H A,JOHARI M A M,et al. Comparison study of ammonia and COD adsorption on zeolite, activate dearbon and composite materials in landfill leachate treatment[ J ]. Desalination, 2010,262(1/2/3) :31-35.
10MARKOU G, VANDAMME D, MUYLAERT K. Using natural zeolite for ammonia sorption from wastewatcr and as nitrogen releaser for the cultivation of Arthrospira platensls [ J ]. Bioresource Technology ,2014,155 ( 3 ) :373 -378.