| Based on water quality weekly report data in Shilong section of Jinjiang river in 2019, the seasonal variation of water quality index was analyzed, and the water quality was evaluated by single factor index method. The results showed that the annual variation range of pH value was from 6.68 to 7.54, and the order of seasonal mean value was autumn＜winter＜spring＜summer. The annual variation of DO ranged from 5.0 mg/L to 9.7 mg/L, which was higher in spring and winter than in summer and autumn. The annual variation range of IMn was from 1.5 mg/L to 3.4 mg/L, which was slightly higher in spring and summer than in autumn and winter. The annual variation range of NH3-N was from 0.08 mg/L to 0.51 mg/L, which was higher in spring and winter than in summer and autumn. The annual variation range of TP was from 0.042 mg/L to 0.169 mg/L, which was the highest in spring, followed by summer and winter, and the lowest in autumn. The concentration of Cr (Ⅵ) was stable at 0.002 mg/L throughout the year. According to single factor evaluation method, the water quality of Jinjiang river met class Ⅲ water quality standard. TP was significantly correlated to NH3-N by t test because they might be affected by the same pollution source. |
