Vanadium is undesired constituent found in crude oil and its products, where, it has many side effects in refineries, affects the catalyst activity and corrosion problems in plants. This paper offers analytical determination method of vanadium from crude oil and some petroleum products by extraction. The extraction was accomplished in 6 h at 80ºC in basic media, followed by sample preparation, finally, spectrophotometric measurements at λmax of 395 nm.The results showed various vanadium content of crude oil (31.25 -223.75) ppm, fuel oil 210 ppm, kerosene 166.25 ppm, gasoline (285 -287.5) ppm, lubricating engine oil (157.5 -251.25) ppm and turbine oil (186.25 -202.5) ppm.
Trace levels of mercury in soil, environmental water (portable and polluted) and plant specimens (cucumber and pepper) at Koya area – Kurdistan region – Iraq was described by simple procedure, where, no further solvent purification or pre-concentration required steps. The method based on soxhelt extraction with oxalic acid and stannous chloride in acidic media for about 2.5 h, followed by spectrophotometric measurement at λmax of 300 nm.
The results show different mercury levels, water samples show (3-215) ppm, while soil samples (5 -150) ppm. Also, some agricultural products show (23 -80) ppm mercury level.
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