By Edward D. Pittman, Michael D. Lewan
In may perhaps of 1991, Victor Van Buren, who used to be then with Springer Verlag in ny urban, requested us for well timed themes within the earth sciences that will be applicable for book as a booklet. all of us fast agreed that fresh curiosity and study task at the function of natural acids in geological strategies might make a well timed publication in this different and debatable subject. As coeditors, we defined bankruptcy subject matters for this sort of booklet that maintained a superb stability among geological and geochemical pursuits. particular authors have been then hunted for all of the bankruptcy issues. We had extraordinary good fortune in getting top researchers as authors, and their reaction was once universally enthusiastic. This technique has been so much fulfilling in that it presents a unity and conciseness that's not regularly found in books representing compilations of papers from symposia. This e-book doesn't get to the bottom of the controver sies that exist in regards to the importance of natural acids in geolog ical procedures. even though, it does current each side of the controver sies when it comes to to be had info and present interpretations. Readers could pass judgement on for themselves and envisage learn essential to get to the bottom of those controversies sooner or later. We thank the authors of this ebook for his or her participation, commitment, and cooperation. we're additionally thankful for aid from Dr. Wolfgang Engel and his employees at Springer-Verlag (Heidelberg) in expediting the enhancing and book of this booklet in a well timed manner.
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Additional resources for Organic Acids in Geological Processes
Photometric absorbance, particularly UV, is of great utility in the analysis of organic ions. It is limited to ions that absorb electromagnetic radiation in an easily detectable range, either as molecules or as complexes, and that have distinctive absorbance bands. Photometric absorbance is also limited in sensitivity by impurities in the eluent. Also, many inorganic species do not absorb electromagnetic radiation, either as ions or complex ions. Further, photometric absorbance is not an effective method when organic regenerants are used in eluent suppression (such as in the analytical technique described above), because of the resultant high background.
Nonionic or weakly ionic species, such as the organic acids and anions, are unaffected by the semipermeable membrane and are free to diffuse in and out of the resin pores. The primary separation of various aqueous species of noncharged or weakly charged ions is diffusion in and out of the resin pores. The rate of diffusion is controlled by eluate pKa, eluent pH, resin hydrophilicity and other characteristics, and temperature. Generally, for the short-chain organic acids and anions, pKa can be used to predict elution order (see Fig.
Using data from Oligocene reservoirs in Texas and Miocene reservoirs in the San Joaquin Basin of California, Carothers and Kharaka (1978) showed that the relative abundance of bicarbonate and organic alkalinity varied with temperature. More recent data confirm this general trend, demonstrate significant variation from basin to basin, and show that the San Joaquin Basin is unusual in the very high organic acid concentrations and in the abundance of organic acid anions relative to bicarbonate (Fig.