Purifying agent for purifying soil or ground water, process for producing the same, and method for purifying soil or ground water using the same

摘要

A purifying agent for purifying soil or ground water which comprises a water suspension containing iron composite particles comprising ±-Fe and magnetite, and having an average particle diameter of 0.05 to 0.50 µm, an S content of 3500 to 10000 ppm and an A1 content of 0.10 to 1.50% by weight, and polyaspartic acid or a salt thereof. The purifying agent is capable of decomposing aliphatic organohalogen compounds or aromatic organohalogen compounds contained in the soil or ground water in an efficient, continuous and economical manner.