Direct Determination of Metalloporphyrins in Boscan Crude Oil.
Direct Determination of Metalloporphyrins in Boscan Crude Oil.
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DOI：
10.1021/je60013a034
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发表时间：
1962-04
影响因子：
--
通讯作者：
J. Sugihara;R. Bean
中科院分区：
文献类型：
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作者：
J. Sugihara;R. Bean
结果与讨论 测定石油馏分中卟啉的常用方法 (5, 9) 需要用乙酸中的溴化氢进行初步消解。所得不含金属的卟啉直接测定 (5) 或通过萃取纯化然后测定 (9)。在前一过程中，索雷带下的面积是在校正背景吸光度后通过分光光度法测定的。这些方法表明作为快速和常规分析程序直接测定卟啉金属络合物的可能性。在分光光度分析中，首先需要确定可靠的消光系数。在这种情况下，由于存在许多不同的氧钒基和镍型金属卟啉以及在吡咯环的/3-位具有不同取代基的分子，导致了主要的复杂性。外围附件的变化对 Soret 带的影响远小于对可见光范围内峰值的影响。因此，使用 Soret 乐队
RESULTS AND DISCUSSION The common methods (5, 9) of determination of porphyrins in petroleum fractions require initial digestion with hydrogen bromide in acetic acid. The resulting porphyrins freed of metals are determined directly (5) or purified by extraction and then determined (9). In the former procedure, the area under the Soret band is determined spectrophotometrically after a correction for background absorbance. These methods suggested the possibility of direct determination of porphyrins as their metal complexes as a rapid and routine analytical procedure. In an spectrophotometric analysis, the determination of a reliable extinction coefficient is required as one of the first operations. In this instance, the principal complications arise as a consequence of the presence of many different metalloporphyrins of both vanadyl and nickel types and of molecules with different substituents in the/3-positions of the pyrrole rings. Changes inperipheral attachments have much less effect on the Soret band than on the peaks in the visible range. Thus the use of the Soret band for