N,N'-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct determination of chromium in original matrix of liquid oils.The method is based on the complexation of N,N'-bis(4...N,N'-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct determination 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 spectrophotometric determination at 355 nm against reagent blank.Complexation of MSE and chromium is completed in20 seconds at molar ratio 1∶1.The molar absorptivity and the formation constant of the complex are determined as 9 740L·mol^(-1)·cm^(-1) and 3.6(±0.1)×10~5,respectively.Beer's law is obeyed in range 0.02~1.50mg·L^(-1) chromium concentration.Limits of detection and quantification of the suggested method were7.5 and 25.11μg·kg-,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.展开更多
基金the Scientific and Technological Research Council of Turkey(TUBITAK-TBAG project number 105T153)
文摘N,N'-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct determination 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 spectrophotometric determination at 355 nm against reagent blank.Complexation of MSE and chromium is completed in20 seconds at molar ratio 1∶1.The molar absorptivity and the formation constant of the complex are determined as 9 740L·mol^(-1)·cm^(-1) and 3.6(±0.1)×10~5,respectively.Beer's law is obeyed in range 0.02~1.50mg·L^(-1) chromium concentration.Limits of detection and quantification of the suggested method were7.5 and 25.11μg·kg-,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.
