1979 年 28 巻 8 号 p. 565-569
A number of telomer-type surfactants containing various functional groups were synthesized. These surfactants formed the insoluble metal complexes with various metal ions in an aqueous solution. In this paper, these telomer-type surfactants were used as the coagulants having the properties to suppress Cd2+ elution from Cd-contaminated soil and the properties were compared to those of other coagulants.
In the qualitative precipitate test of telomer-type surfactants with Cd2+, Ca2+, and Fe3+ at a low pH solution, only Cd2+ was precipitated on addition of Lo11.4 HD94 containing hydrazino group at pH 35, The telomer-typ surfactants were more ineffective than others for formation of insoluble Cd complexes in an aqueous selution, however Lo10.3 HD100 as well as DDC was quite effective for coagulation of Cd2+ in Cd-contaminated kaolin. The coagulation effect of Cd2+ was little when commercial soil coditioners or commercial flocculants were used. Lo10.3 HD100 was more stable to light and temperature than DDC, therefore, Lo10.3 HD100 is considered to be the best coagulant.