1987 年 3 巻 1 号 p. 45-48
A complexing material, 2-mercaptobenzothiazole loaded silica gel (MBT/SG), was prepared for rapid preconcentration of trace amounts of silver(I) from water samples. Silver(I) was quantitatively retained on the MBT/SG from solution of pH 0-6.3 in batch experiments, while the untreated silica gel captured only 5% of the element in the solution. The retention capacity of the loaded gel was about 8.8mg Ag g-1 (81.5μmol g-1) at pH 4.0. The mole ratio of MBT to silver was about 8.3. Silver was quantitatively retained on the MBT/SG column at a high flow velocity (18.8cm min-1). The silver retained on the column was completely eluted with 10-15cm3 of 0.1mol dm-3 nitric acid containing 2% thiourea, and directly determined by one-drop atomic absorption spectrometry. Silver contents of near-shore seawater were determined by the present method.
