NDLI: STUDY OF NANOSECOND ND: YAG 213 nm LASER ABLATION OF EXTRA HEAVY CRUDE OIL BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY

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STUDY OF NANOSECOND ND: YAG 213 nm LASER ABLATION OF EXTRA HEAVY CRUDE OIL BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY

Content Provider	Semantic Scholar
Author	Wuyke, Henry Feo, Llinaber Murillo, Miguel
Copyright Year	2013
Abstract	The Laser-Extra Heavy Crude Oil interaction was studied using a nanosecond Nd:YAG 213 nm laser coupled to an ICP-MS. For this study, ~2.7 g Extra Heavy Crude Oil was mixed with ~3 mL xylene and 0,3 g organic multielemental solution containing 100 µg g-1 of Ag, Al, Ba, Cd, Cr, Cu, Mg, Mn, Mo, Ni, Pb, Sn, Ti, V, and Zn, xylene was left to evaporate at 90 °C and multielemental samples were obtained and analyzed by LA-ICPMS. Laser parameters, such as, ablation gas flow, sample scanning speed, spot size, fluence and focus position were optimized and RSD (n = 8) from 3% to 5% for the net signal of 63 Cu, 95 Mo, 60 Ni and 66 Zn and from 0.9% to 3.3% for the ratios Ni/Mo and Cu/Zn were obtained. Elemental fractionation was observed with both Zn and Cd when fluence was varied. Nevertheless, evidence is not enough to explain results as a consequence of high volatility or high ionization potential (PI) of these elements. Ablation craters obtained show signs of more pronounced thermal processes at higher fluences. Elemental fractionation was also observed in the ICP due to mass load effect. Isotopic ratios 95 Mo/ 112 Cd, 63 Cu/ 66 Zn y 27 Al/ 24 Mg, which have different ionization potential (1.89; 1.68 and 1.66 eV, respectively expressed as PIdenominator - PInumerator) increase when mass load is increase. On the other hand, 60 Ni/ 63 Cu ratio (0.09 eV difference) remains constant. These results indicate that the plasma ionization temperature decreases when mass load is increased affecting those elements with high ionization potential.
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Language	English
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Content Type	Text
Resource Type	Article

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