Abstract
Nickel porphyrins and oxovanadium porphyrins in oilsandstone produced in Bolivia of South America were analyzed by three-dimensional reversed phase high-performance liquid chromatography (3DHPLC)and accurate mass determination with El-MS. Twenty-one species of nickel porphyrin and twelve species of oxovanadium porphyrin were present in oilsandstone, respectively (Figs.5 and 6). The demetalation products of nickel porphyrins were also analyzed by 3D-HPLC (Fig.8). They had four absorption maximums for Q-band in the wavelength region 490 to 620 nm. The order of absorbance of the maximums for Q-band gave the presence of two types of porphyrins, namely deoxophylloerythroetioporphyrin (DPEP) type and etioporphyrin type, distinguished by containing pentane ring.
From result of 3D-HPLC and accurate mass determination, twenty-four species of nickel porphy rins and eighteen species of oxovanadium porphyrins have been found to present, resepectively. The number of DPEP type species of nickel porphyrins was less than that of etioporphyrin type species of them. On the other hand, both types of oxovanadium porphyrins were almost equal in number of their species (Table 1). Therefore, thermal transformation of DPEP type into etioporphyrin type in production process of fossil fuels was suggested.
