特殊型界面活性剤の研究 (第7報)

ヒドラジノ基を有するテロマー型界面活性剤によるカドミウム汚染カオリン中のカドミウム凝固について

抄録

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 Lo_11.4 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 Lo_10.3 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. Lo_10.3 HD₁₀₀ was more stable to light and temperature than DDC, therefore, Lo_10.3 HD₁₀₀ is considered to be the best coagulant.