An improved spectrophotometric method for the determination of silver with 5-[p-(dimethylamino)benzylidene]rhodanine.
The proposed spectrophotometric determination of Ag(+) with 5-[p(dimethylamino)benzyl-idene]rhodanine has the following improvements: (1) more effective control of pH; (2) use of poly(vinyl alcohol)-200 as the protective colloid to enhance the molar absorptivity to 3.5 x 10(-4) l.mole(-1).cm(-1) and to lengthen the period of stable absorbance to 50 min; (3) use of lactic and hydrofluoric acids as maskants to improve the selectivity. Beer's law is obeyed over the range 10-40 mug of Ag. The standard deviation is 0.39 mug of Ag (n = 14).
Nan
Z
Z
Shanghai Research Institute of Materials, MMBEI, Shanghai, People's Republic of China.
Min
Z
Z
Chun-Xiang
H
H
Zhao-Qiang
J
J
Li-Fen
L
L