BS 2000-433:1998 Methods of test for petroleum and its products-Petroleum products. Determination of vanadium and nickel content. Wavelength-dispersive X-ray fluorescence spectrometry
1998BS 2000-433:1998 Methods of test for petroleum and its products-Petroleum products. Determination of vanadium and nickel content. Wavelength-dispersive X-ray fluorescence spectrometry