科研之友
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摘要
The interaction of naphthochrome green (NCG) with polyvinylpyrrolidone (PVP) and the complexation of NCG with Cu on PVP chain were investigated in basic medium by the spectral correction technique. The binding of NCG on PVP by the electrostatic attraction obeys the Langmuir isothermal adsorption in aqueous solution. Both the NCG-PVP aggregate and Cu-NCG-PVP ternary complex was characterized at 20degreesC, 40degreesC, and 60degreesC. The presence of PVP sensitized the complexation between Cu and NCG. This novel approach is sensitive and selective in the presence of citrate and has been applied to the quantitative detection of Cu traces in samples with satisfactory recovery.
