Table 2 Single pollution index (PI), contamination factor (Cf), sum of contamination (PIsum) and Nemerow pollution index (PINemerow) of nickel-excess (NS) and control sites (CS).

From: Nickel excess affects phenology and reproductive attributes of Asterella wallichiana and Plagiochasma appendiculatum growing in natural habitats

 

Single pollution index (PI)

Contamination factor (Cf)

Sum of contamination (PIsum)

Nemerow pollution index (PINemerow)

Ni

Cu

Zn

Ni

Cu

Zn

Control site (CS)

0.353a

0.07429a

0.01017a

2.05a

0.0578a

0.01017a

0.45269a

0.859a

Nickel-excess site (NS)

4.31b

0.08611a

0.008857b

25b

0.067b

0.008857b

4.41825b

2.412b

  1. For the PI and Cf, concentrations of Ni, Cu and Zn measured in the CS and NS (n = 5) were compared with their respective world mean value37. PIsum was calculated using the geometric mean of PI of each metal in the CS and NS. Different letters (a and b) within a column indicate significant differences from each other in all combinations (Tukey’s test, P ≤ 0.05).
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