摘要:

Different aluminium species react with oxine at different rates, a behaviour that we have used as the basis of an analytical method. The reaction is performed in a FIA system and is terminated by extraction of the excess oxine, together with the aluminium trioxinate formed, into chloroform. The reaction time is 2.3 sec, much shorter than that used normally. After separation, the amount of aluminium trioxinate in the organic phase is determined spectrophotometrically.

ISSN:0306-7319    

DOI:10.1080/03067319208027043

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A method for the determination of pentachlorophenol (PCP) in large volumes of sea water and suspended particulate matter is described. PCP is methylated using methyl iodide in the presence of tetra-butylammonium hydroxide (TBA). The methyl derivative, pentachloroanisole, is quantified by capillary gas chromatography using electron-capture detection. Recovery and the coefficient of variation of the analytical method are found to be: 78% and 4.6% respectively, (n= 17).

ISSN:0306-7319    

DOI:10.1080/03067319208027044

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Automobile exhaust gases were analyzed by Raman spectroscopy using stationary and dynamic sampling of the gas. The Raman polychromator was designed especially for large optical throughput. The polychromator is based on a specifically corrected concave grating and F/0.7 optics at the entrance and the exit of the system. At measuring times in the order of 1 s, it was possible to correlate the carbon oxides, oxygen and hydrogen to nitrogen as standard. The detection of various hydrocarbons occurred at measuring times of several minutes. The contribution includes also a discussion of the nitrogen oxide problem.

ISSN:0306-7319    

DOI:10.1080/03067319208027045

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The particulate heavy metal concentrations of Tl, Cu, Cd, Pb, Zn, Ni, Cr, and Fe were determined in the atmosphere over the Atlantic Ocean from 77°S (Antarctica) to 54°N (Europe) using the analytical method of isotope dilution mass spectrometry. The samples were collected on board of the German polar research vessel “Polarstern” during four different expedition legs from September 1987 to March 1990. Analyses of the crustal reference element Fe resulted in the calculation of enrichment factors EF(Fe), which were used for interpretation of crustal influences on heavy metal contents as well as for contamination control. The variations in concentration of the dominant crust element Fe run up to five orders of magnitude (0.22–36200 ng m−3). The region between the equator and 20°N was strongly influenced by crustal material transported by the north-eastern trades out of the Sahara. EF(Fe) values around unity and the highest measured concentrations of the dominant crustal elements Fe (36200 ng m−3), Cr (50.6 ng m−3), and Ni (33.7 ng m−3) were found in this area. The mainly anthropogenic elements Cd, Pb, and Zn reached their maximum concentration approaching the European Continent in the English Channel: Cd (1.3 ng m−3), Pb (61.6 ng m−3), Zn (115.9 ng m−3). Elements like Tl and Cu had their highest concentration in the area influenced by Saharan mineral dust (Tl = 96.6 pg m−3, Cu = 9.9 ng m−3) as well as near the highly industrialized European Continent (Tl = 212 pg m−3; Cu = 11.1 ng m−3). A difference in contents between the South Atlantic and the North Atlantic was registered as roughly one order of magnitude for Tl, Cd and Pb. Data from former expeditions were in good agreement with respect to the corresponding meteorological and local conditions. The absolutely lowest concentrations of <0.2–4 pg m−3were measured for Tl in the remote Antarctic region. The contents of the other trace elements in Antarctica were determined to be: Cu = <0.03–0.3 ng m−3, Cd = 0.005–0.5 ng m−3, Pb = 0.07–0.9 ng m−3, Zn = < 1–21 ng m−3, Ni = <0.03–0.06 ng m−3, Cr = <0.04–0.1 ng m−3, and Fe = 0.2–9 ng m−3. The high EF(Fe) values of Zn = 240–16000, of Pb = 230–1800 and especially of Cd = 800–90000 suggest that other sources than crustal material are responsible for the measured contents in this area, e.g. biogenic emissions.

ISSN:0306-7319    

DOI:10.1080/03067319208027046

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0306-7319    

DOI:10.1080/03067319208027042

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor