Author : Hufdhi, Rawaa
A Rabid and Sensitive Spectrophotometric Determination of copper (II) and platinum (II) using new reagent of 5-[(4-hydroxy phenyl) azo]-4,6-di hydroxy-2-mercapto pyrimidine
journal of kerbala university,
2005, Volume 1, Issue 0, Pages 294-302
A new reagent of 5-[(4-hydroxy phenyl) azo]-4,6-di hydroxy-2-mercapto pyrimidine (HPAdMPm-HL) has been synthesized and used as a sensitive and selective analytical reagent for spectrphotometric determination of micrograms of copper (II) & platinum (II) .
HPAdMPm reacts with copper (II) & platinum (II) in PH (5) to form an intense color soluble product , that is stable and has a maximum absorption at (621,612) nm with molar absorptivity (0.109×104 , 0.576×104) L.mol-1.cm-1 respectively.
Beer‘s law is obeyed in the concentration range (0.05 - 10) mg.ml-1 for copper and (0.05 - 15) mg.ml-1 for platinum . A repetition of the method is checked by finding the relative standard deviation % (R.S.D) for copper & platinum (n=7) which is (3.28 , 0.6) % respectively . The composition of Cu (II) – HpAdMPm & Pt (II) – HpAdMPm complex is established as 1:1 by molar ratio and continuous variation .
The interferences of ions ( Fe3+ , Ag+ , Ni2+ , Zn2+ , Cr3+ , Co2+ , NO2- , SO4= , Cl- , CO3= , F- , NO3- ) were studied and masked by using appropriate masking agents .