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 Cd
2+ 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 Cd
2+, Ca
2+, and Fe
3+ at a low pH solution, only Cd
2+ was precipitated on addition of Lo
11.4 HD
94 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 Lo
10.3 HD
100 as well as DDC was quite effective for coagulation of Cd
2+ in Cd-contaminated kaolin. The coagulation effect of Cd
2+ was little when commercial soil coditioners or commercial flocculants were used. Lo
10.3 HD
100 was more stable to light and temperature than DDC, therefore, Lo
10.3 HD
100 is considered to be the best coagulant.
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