Abstract
New, sensitive, accurate and inexpensive kinetic spectrophotometric method was developed and validated for the determination of V(V) in crude oil and its heavy product. The method is based on the formation of colored complex between V(V) and 1, 5-diphenylcarbazide (DPCI). The method involves the reaction of V(V) with DPCI in presence of buffer solution of pH 6.8 to form colored complex with λmax at 530 nm. The fixed time method (2000 Sec) was adopted for constructing the calibration curve. The linearity range was found to be (2-12) mg/L. The correlation coefficient was 0.9999 and the limit of detection was found to be 0.349 mg/L. The method is feasible with the calibration equations obtained, which makes this method more applicable. Statistical treatment of the experimental results indicates that the method is precise, selective and accurate. The method was successfully applied for determination of V(V) in Syrian crude oil and its heavy product.
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