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Spectrophotometric Determination of Chromium ( VI ) Using a new Organic Reagent 4 – ( 6 – Nitro – 2 – Benzothiazolylazo ) – Resorcinol | ||
| journal of al-qadisiyah for pure science(quarterly) | ||
| Article 1, Volume 9, Issue 1, 2009, Pages 71-78 PDF (0 K) | ||
| Author | ||
| Azhar A . Ghali | ||
| Abstract | ||
| This work include the preperation of a new organic reagent 4 – (6 – Nitro – 2 – benzothiazolylazo ) – resorcinol ( 6 – NO2BTAR ) and it's use spectrophotometric method for determination of microamounts of chromium . (6–NO2BTAR ) reacts with chromium ( VI ) to form a stable orange 1 : 2 ( metal : ligand ) complex at 460 nm at pH 7.2 . The molar absorptivity of the complex is 3423 L . mol-1 . cm-1 . Beer's law is obeyed in the rang ( 0.5 – 25 ) µg . ml-1 with a detection limit of 0.31 µg . ml-1 and the stability constant was found to be 9.2059 × 109 L2 . mol-2 . The relative standard deviation , recovery and relative error values of method were found to be R.S.D%=1.05%,Re%=99%,Erel=-1% . The most important interference were du to Ag+,Cd2+,Cu2+,Ni2+,Fe2+,Co2+,Fe3+, and MoO42- and suitable masking agents were used . The method was applied successfully for determination of chromium in clay river of AL – Hilla . | ||
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