Abstract
1. We tested on the relation between wax content in sand to the penetrating power of wetting agents by using columns of sand. The results were as follows:
a) When sand has no paraffin wax, penetrating power of wetting agent solution decrease as larger amount of wetting agent are added, and show alway lower ability than that of water.
b) When sand is contained 0.124∼0.37% of paraffin wax, the penetrating power reach a maximum at some intermediate concentration (0.005∼0.05%) of wetting agents.
c) When sand is contained more than 0, 45% of paraffin wax, solution which contained lower conecntration than 1 percent of wetting agents can not penetrate into the sand and the penetrating power represents as more than 1 percent of wetting agent is added.
2. The toxicity of phenyi mercuric acetate for Hypochnus centrifugus and Ophiobolus Miyabeanus show a maximum when 0.005∼0.05% of wetting agents is added. This fact is seemed to concern the sand test b.
3. The injury of phenyl mercuric acetate solution for germination of wheat seed don't appear when less than 0.5% of wetting agent is added, whereas it show injury when more larger amount is added. This fact seemed to concern the sand test c.
When the rice seed is treated with same solution, injury is reached a maximum by the addition of 0.005∼0.05% of the wetting agent.
Those phenomenons given above, seem impossible interpret the results in term of surface tention and contact angle. It is seemed by the effect of differencial abilities at critical micell concentration of wetting agent solutions for materials that containing varily lips.
