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7302875 
Journal Article 
Spectrophotometric Determination of Lead in Tea Leaf Sample with Dibromo-p-chloro-arsenazo 
Zhai, QZ; Li, JMei; Zhang, JunP 
2013 
Yes 
Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 
25 
1 
538-540 
WOS:000312620300111 
This work reports the use of dibromo-p-chloro-arsenazo (DBC-ASA) as a chromogenic agent to develop a new spectrophotometric method for the determination of lead using Pb2+-(DBC-ASA) complex. In the medium of 0.10 mol L-1 phosphoric acid, the maximum absorption wavelength of Pb2+-(DBC-ASA) violet-red complex formed is located at 614 nm. At this wavelength a good linearity is presented between the concentration range of 0.1-3.5 mu g mL(-1) of lead(II) and absorbance and its linear regression equation is: A = 0.130 C (C:mu g/mL) + 0.007. The apparent moler absorption coefficient of the method is 3.33 x 10(4) L mol(-1) cm(-1) and its detection limit is 0.225 mu g mL(-1). The method was used to determine lead in some tea leaf samples and the obtained results are in good agreement with those of atomic absorption spectrometry. The relative standard deviation of 13 replicate determinations was (0.43-0.80) %. The recovery of the standard addition of the method was (96.0-98.5) %. 
Dibromo-p-chloro-arsenazo; Lead; Tea leaf sample; Spectrophotometry