Novel and Validated Spectrophotometric Matrix Matching Method for Simple and Rapid Determination of Chromium in Oily Media

N,N’-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct de-termination of chromium in original matrix of liquid oils.The method is based on the complexation of N,N’-bis (4-methoxysalicylidene)ethylenediamine and chromium in n-hexane∶acetone (1∶4)medium and spectropho-tometric determination at 3 5 5 nm against reagent blank.Complexation of MSE and chromium is completed in 20 seconds at molar ratio 1∶1.The molar absorptivity and the formation constant of the complex are deter-mined as 9 740 L·mol-1 ·cm-1 and 3.6(±0.1)×105 ,respectively.Beer’s law is obeyed in range 0.02~1.50 mg·L-1 chromium concentration.Limits of detection and quantification of the suggested method were 7.5 and 25.1μg·kg-1 ,respectively.The accuracy and precision of the method was checked by finding mean recovery and relative standard deviation by oil-based chromium standard analysis as 96.4%±1.4% and 1.5%, respectively.The practical applicability of elaborate method was tested using oil-based chromium standard spiked and unspiked corn,sunflower,soybean,olive and canola oils.