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Journal of Chemistry
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2021
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Article
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Tab 2
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Research Article
Groundwater Quality Evaluation for Potable Use and Associated Human Health Risk in Gaobeidian City, North China Plain
Table 2
Classification standards of groundwater quality according to EWQI.
Rank
EWQI value
WQI class
1
<50
Excellent
2
50–100
Good
3
100–150
Medium
4
150–200
Poor
5
>200
Extremely poor