International Journal of Analytical Chemistry / 2015 / Article / Tab 1

Research Article

Risk Assessment and Prediction of Heavy Metal Pollution in Groundwater and River Sediment: A Case Study of a Typical Agricultural Irrigation Area in Northeast China

Table 1

Classification of NI.

ClassPollution degreeNI

0No pollution≤0.5
1Clean0.5–0.7
2Warm0.7–1.0
3Polluted1.0–2.0
4Medium pollution2.0–3.0
5Severe pollution>3.0

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