Abstract
Research on the growth rate of Spirulina sp. carried out in BG-11 medium with UV light intensity of 3000 lux and a temperature of 25 ˚C with the addition of metal ion Cd(II) concentration was carried out. An initial abundance of Spirulina sp. in the medium is 10.103 ind./L with the concentrations of Cd(II) added to the culture medium of 0, 1, 3, and 5 mg/L, respectively. Spirulina sp. growth rate in the control media continued to increase until the exponential phase on the seventh day with growth rate of growth rate of 4.3×103 ind/L/day, while the medium with the addition of Cd(II) with concentrations of 1, 3, and 5 mg/L experienced a decrease in growth rate of 3.9×103 ind/L/day, 3.8×103 ind/L/day, and 0.07×103 ind/L/day, respectively. The concentration of Cd(II) 5 mg/L in the culture medium of Spirulina sp. decreased the growth significantly. So that it can be concluded the potential use of Spirulina sp. as an adsorbent of Cd(II) metal can be effective at concentrations up to 3 mg/L.
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