Zobrazeno 1 - 10
of 33
pro vyhledávání: '"C. M. G. van den Berg"'
Autor:
C. M. G. van den Berg, Katharina E. Fabricius, Rebecca Zitoun, Miles D. Lamare, Sam H. C. Noonan, Linn Hoffmann, Mary A. Sewell, Sylvia G. Sander, Sean D. Connell, J. Murdoch, Nick T. Shears, Kim I. Currie, Christopher E. Cornwall, Abigail M. Smith
Publikováno v:
Marine and Freshwater Research. 71:321
In situ effects of ocean acidification are increasingly studied at submarine CO2 vents. Here we present a preliminary investigation into the water chemistry and biology of cool temperate CO2 vents near Whakaari–White Island, New Zealand. Water samp
Publikováno v:
Marine Geology. 182:373-387
Ferro-manganese nodules of the western Baltic Sea reveal enhanced heavy metal concentrations since the end of the 19th century and are therefore potentially useful for retrospective monitoring of the heavy metal pollution history. However, only Zn sh
Publikováno v:
Fresenius' Journal of Analytical Chemistry. 358:703-710
The development of a compact instrument for on-line measurement of trace metals in seawater is described. The system is based on adsorptive cathodic stripping voltammetry (ACSV), and on the concept of sequential flow analysis, to perform on-line meas
Autor:
C. Collado-Sánchez, C. M. G. van den Berg, JA Herrera-Melián, J. J. Hernández-Brito, J. Pérez-Peña
Publikováno v:
Electroanalysis. 6:1069-1076
The voltammetric determination of trace metals in seawater suffers from the interference of dissolved oxygen and engine vibrations onboard ship. It is here attempted to overcome these interferences using a high-frequency (1 to 20 kHz) staircase modul
Publikováno v:
TrAC Trends in Analytical Chemistry. 13:348-352
Instrumentation and methods are described for collecting surface sea water using pumping with subsequent in-line analysis by stripping voltammetry or chronopotentiometry. The review is illustrated with data for estuarine copper and nickel, and the di
Publikováno v:
Analytica Chimica Acta. 291:213-232
The use of in-line UV-digestion for breakdown of dissolved organic matter (DOM), prior to voltammetric determination of trace metals in natural samples, is discussed in this paper. Destruction of DOM is necessary to free trace metals that are organic
Publikováno v:
Analytica Chimica Acta. 284:463-471
An automated and semi-intelligent voltammetric system is described for trace metal analysis. The system consists of a voltammeter interfaced with a personal computer, a sample changer, 2 peristaltic pumps, a motor burette and a hanging mercury drop e
Publikováno v:
Analytica Chimica Acta. 284:481-496
Copper complexing ligands in sea water were determined by cathodic stripping voltammetry (CSV) with ligand competition using salicylaldoxime (SA) at a detection window intermediate to that and overlapping with those currently available using other el
Autor:
C. M. G. van den Berg
Publikováno v:
Marine Chemistry. 34:211-223
Cathodic stripping chronopotentiometry (CSC) is readily suitable for automation, and the sensitivity is often not affected by variations in the major ion concentration (the salinity) or by the dissolved concentration of oxygen. This technique is ther
Autor:
Shaukat H. Khan, C. M. G. van den Berg
Publikováno v:
Analytica Chimica Acta. 231:221-229
A procedure is presented for determining Se(IV) and total dissolved Se in sea water using cathodic stripping voltammetry in the presence of added copper. Experiments using cyclic voltammetry indicate that the preconcentration step consists in adsorpt