Spectrophotometric determination of Cr(III) and Pb(II) using their complexes with 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene

New complexes of 5,11,17,23-tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene (teac) with pb(ii) and cr(iii) were prepared in basic solution with a mixture of meoh and h as solvent. the ratio of teac and metal ion in complexes was found to be 1: 1 under investigated condition. the complex formation constants (based on benesi-hildebrand method) for teac-pb(ii) and teac-cr(iii) were 4.03 × 104 and 1.2 × 104,respectively. additionally,the molar extinction coefficients were 5 × 104 and 1.42 × 104 for teac-pb(ii) and teac-cr(iii),respectively. the h-point standard addition method (hpsam) has been applied for simultaneous determination of complexes formation of cr(iii)/pb(ii) and teac with concentration from 2: 1 to 1: 20 (w/w). the proposed method was successfully utilized to invest lead and chromium contents in plating wastewater samples. the results for several analyzed samples were found to be in satisfied agreement with those acquired by using the inductively coupled plasma mass spectrometry (icp-ms) technique. © 2015 le van tan et al.