Effects of Inorganic Colloid Particle and Trace Metals on the Growth of Skeletonema costatum

Skeletonema costatum was cultivated with the addition of inorganic colloid substance of Fe(OH) 3 colloid and illite colloid and trace metals of iron and copper. The results showed that cell abundance and growth rate were promoted with a few Fe(OH) 3 colloid particles; however, they were restrained with more colloid (0.5mg/L). The optimal quantity for Skeletonema costatum ranged from 0.25mg/L to 0.50mg/L. When some illite colloid was added, microalga growth was inhibited. Through the adjustment of illite colloid for the concentration of iron and copper, the growth of Skeletonema costatum was influenced directly.