Percentage decrease in the productivity
Metal Conc. (mg/L) 1st day 3rd day 7th day 8th day
1 99.21 99.23 77.96 88.58
2 93.82 84.3 65.22 74.79
3 86.09 74.38 56.3 64.79
4 77.03 64.46 27 57.45
Table 2: Percentage decrease in the productivity of Spirulina (Arthospira) indica
due to increase in Cd (II) ion concentration.