Application of Carboxylic Carbon Nanotubes for the Rapid Determination of Lead by Spectrophotometry

摘要

A novel spectrometric method for determination of lead was developed with the application ofcarboxylic carbon nanotubes (CNTs). The optimum operating conditions including pH, volume andaddition order of reagents solution were established. The nature of the novel complex was alsoinvestigated. Comparative experiments proved that the application of carboxyl CNTs exhibit theobvious hyperchromic effect: the absorbance of the complex was increased by nearly 52.2% throughoptimizing the technological parameters; the coloration system showed the maximum absorbance at5 -1 -1 580.4 nm with a molar absorptivity value of 1.3510 L mol cm ; the calibration graph was linear inthe range 14.0 g/25.0mL and the limit of detection was 10.4 ng/mL. The proposed method issimple, sensitive and direct for the determination of lead.