ビス(2-アミノエチル)ジチオカルバミン酸を用いる銅(2)の吸光光度定量

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Bis (2-aminoethyl)dithiocarbamic acid (BADTC) was synthesized and fundamental conditions for the determination of copper(II) with the BADTC was investigated. The synthesis of the BADTC was carried out as follows: To ca. 25 g of carbon disulfide in 300-ml iso-propyl alcohol previously cooled on a water bath is added dropwise ca. 30 g of diethylenetriamine in 100-ml iso-propyl alcohol. The yellow precipitate obtained is recrystallized twice from water and washed several times with small amounts of methyl alcohol. The pale yellowish crystal is dried in air. The BADTC reacts with copper(II) and produces a yellow coloration having an absorption maximum at 437 nm in the presence of excess BADTC to copper(II) and 385 nm in the presence of excess copper(II) to BADTC. The maximum and constant absorbance of the complex is obtained in the pH range 4.0 to 5.0 with acetate buffer solution. The complex is stable for 5 to 40 minutes in the presence of zephiramine (tetradecyldimethylbenzyl-ammonium chloride). Beer's law holds for 12.593.8 μg/50 ml of copper(II). The molar absorptivity is 1.32×104 cm-1·mol-1·l and Sandell's sensitivity for the absorbance of 0.001 is 4.83×10-3 μg·cm-2. The composition of the copper(II)-BADTC complex is estimated to be copper(II) : BADTC=1 : 1 at 385 nm and 1 : 2 at 437 nm by the continuous variation method. The recommended procedure is as follows. To 12.593.8 μg of copper(II) in a 50-ml volumetric flask are added 10 ml of 2×10-3 M BADTC and 15 ml of 1×10-2 M zephiramine solutions. The mixture is adjusted to pH 4.5 with 10 ml of acetate buffer solution and filled up to 50 ml with water. The measurement of the absorbance is carried out 15 minutes after mixing at 437 nm against water. Silver(I), aluminum (III), cobalt (II) and nickel(II) interfere seriously.
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ビス(2-アミノエチル)ジチオカルバミン酸を用いる銅(2)の吸光光度定量

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