Research Article
Analysis of Hydrogeochemical Characteristics of Tunnel Groundwater Based on Multivariate Statistical Technology
Table 1
Conventional indexes and limits of groundwater quality (mg/L).
| Class | pH | TDS | SO42- | Cl- | Fe | Al | NH4+ | Na+ | NO3- | F- | As |
| I | 8.5 | 300 | 50 | 50 | 0.1 | 0.01 | 0.02 | 100 | 2 | 1 | 0.001 | II | 8.5 | 500 | 150 | 150 | 0.2 | 0.05 | 0.1 | 150 | 5 | 1 | 0.001 | III | 8.5 | 1000 | 250 | 250 | 0.3 | 0.2 | 0.5 | 200 | 20 | 1 | 0.01 | IV | 9 | 2000 | 350 | 350 | 2 | 0.5 | 1.5 | 400 | 30 | 2 | 0.05 | V | 9 | 2000 | 350 | 350 | 2 | 0.5 | 1.5 | 400 | 30 | 2 | 0.05 |
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