Research Report RR:D02-1716
A method is presented for the multielement determination of trace metals in crude oils using inductively coupled plasma - atomic emission spectrometry. The samples are diluted with an organic solvent before the measurements. Metallo-organic standards are used as calibration standards. Use of internal standard is mandatory in the analysis. The precision of the analysis was established by conducting an Interlaboratory Study including 18 crude oil samples and involving 16 laboratories. Three each NIST Standard Reference Materials and ASTM ILCP crude oils were also included to compare the bias of the new method against the established ASTM test methods such as D5185, D5708 or D5863. Nickel, vanadium, iron, and sulfur were quantitatively determined. Several other trace elements were below the detection limits of the method.
D7691-11e1 Standard Test Method for Multielement Analysis of Crude Oils Using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)
Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants
Subcommittee D02.03 on Elemental Analysis