Duration Of Amino Acid In Concrete For Algae

The blocks containing amino acid, Arginine, were developed as Environmentally Vitalizing Concrete (EViCon). It has been reported that the efficacy of acceleration to form marine periphytic algae on the concrete block containing Arginine in the actual water area.This work aimed to investigate the behaviour of amino acids in the concrete block in laboratory and actual field to ensure the long duration of the effect. In consequence of the actual field test, Arginine contained in the concrete continued to stimulate the growth of green algae at least four years. These concrete blocks containing Arginine were put in the cistern poured marine water by pump for a half year. Blocks were periodically salvaged. And time courses of distributions of Arginine in the blocks were analysed. Arginine showed to be eluted from the surface till one to two cm of depth. In parallel, elution of Arginine from the blocks was analysed to examine slow release of Arginine for enough long life effect. The elution behaviour was divided to two steps. Firstly, Arginine was sharply eluted. And then elution rate become gentle curve. And more the elution rates were depend on the concentration of Arginine in the concrete. And then, in order to obtain these data, analysis method of amino acids in hardened concrete block was developed with over 90% of recovery ratio.