Characteristics of Heavy Metals and Pb Isotopic Composition in Sediments Collected from the Tributaries in Three Gorges Reservoir, China

Table 2

Description of potential ecological risk degree.

𝐸𝑖	Ecological risk of single metal	RI	Ecological risk of all metals
𝐸𝑖<40	Slightly	RI<150	Slightly
40≤𝐸𝑖<80	Moderately	150≤RI<300	Moderately
80≤𝐸𝑖<160	Strongly	300≤RI<600	Strongly
160≤𝐸𝑖<320	very strongly	600≤RI	Very strongly
320≤𝐸𝑖	Extremely