Np Concentration (mg/ml)

500

250

125

62.5

31.25

15.6

7.8

3.9

1.9

0.97

0.48

% of inhibition

ZrS₂/ZnS

148

140

130

127

110

100

75

74

72

70

15

ZnS

124

86

69

54

37

35

33

31

20

16

5