Methodology for sampling and analysis of lipids in aerosols from the remote marine atmosphere
1984
Peltzer, Edward T. | Alford, Jame B. | Gagosian, Robert B.
A procedure is described for the collection of remote marine aerosol samples by high-volume filtration, cascade impaction, dry fallout collection and rain.Samples were analyzed quantitatively for five classes of naturally occurringlipids (n-alkanes, wax esters, fatty alcohols, sterols, and fatty acids) and polycyclicaromatic hydrocarbons (PAHs). Air samples (4,000-10,000 m3) were collectedon glass fiber filters under automatic control. Rain samples of 1-5 L were collectedon an event basis. Filters and rain samples were extracted with methylene chloride.The extracts were fractionated into discrete chemical classes by silca-gel absorptionchromatography. The fractions were derivatized if necessary and analyzed byHRGC and HRGC/MS. A second fiter extraction was required forfatty acid salt analysis. Internal standards were used to quantify recoveriesand concentrations. Mean recoveries relative to the internal standards were96.5% for C12-C36 n-alkanes, 96.4% for C12-C30 n-fatty acids, 92.5% for C12-C30n-fatty alcohols and 93.3% for cholesterol. Typical blanks and concentrationsfor remote marine aerosol and rain samples are described and compared withother methods used in coastal marine, rural and suburban sampling locations.
اظهر المزيد [+] اقل [-]Prepared for the National Science Foundation under Grants OCE 77-12914 and OCE 81-11947 as part of the Sea-Air Exchange (SEAREX) Program.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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