University of North Florida
Browse the Citations
-OR-

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

View Stuart Chalk's profile on LinkedIn

Olaf Elsholz

Abbrev:
Elsholz, O.
Other Names:
Address:
Fachhochschule Hamburg, Lohbrugger Kirchstrasse 65, 21033 Hamburg, Germany
Phone:
+49-40-42891-2722
Fax:
+49-40-42891-2681

Citations 4

"On-line Determination Of Mercury In River Water At The German Monitoring Station Schnackenburg/Elbe"
Fresenius J. Anal. Chem. 2000 Volume 366, Issue 2 Pages 196-199
Olaf Elsholz, Carsten Frank, Birgit Matyschok, Frank Steiner, Oliver Wurl, Burkhard Stachel, Heinrich Reincke, Manfred Schulze, Ralf Ebinghaus, Maximilian Hempel

Abstract: A monitor is described which provides the online determination of mercury in river water at concentrations from 20 to 1000 ng/L. The measurement includes an on-line digestion with Br-/BrO3- and UV-radiation. Each determination is controlled by an on-line addition of 50 and 100 ng/L mercury carried out by pre-dilution of a 500 and 1000 ng/L stock solution using sequential injection analysis (SIA). One cycle of analysis takes 20 min and results in nine signals. A five days stand-alone operation has been performed successfully. Details are also published at web page: http/www.rzbd.fh-hamburg.de/similar to prmercol.

"New Injection Technique For Flow Injection Atomic Absorption Spectrometry Using Tubing Clamp Valves"
Fresenius J. Anal. Chem. 1996 Volume 355, Issue 3-4 Pages 295-296
Olaf Elsholz

Abstract: A system of tubing clamp valves was used to simulate a six-port valve device for sample injection in flow injection AAS. Operation of the system was illustrated by the determination of Hg in suspended particulate matter by cold vapor AAS. The advantages and limitations of the system are discussed.
Mercury Spectrophotometry Injection technique Suspended particulate matter

"Sequential Injection Standard Addition For On-line Measurement Of Mercury In The River Elbe"
Anal. Chim. Acta 2001 Volume 438, Issue 1-2 Pages 251-258
Olaf Elsholz, Carsten Frank, Burkhard Stachel, Heinrich Reincke and Ralf Ebinghaus

Abstract: The improvement of reliability by a sequential injection procedure for on-line standard addition is described. This procedure is applied to a monitor for on-line determination of mercury in river water at concentrations from 20 to 1000 ng/l. The flow injection cold vapor atomic absorption spectrometry measurement include an on-line digestion by BrCl and UV-irradiation. The instrumental arrangement is controlled by the home-made software FIMS-Master (programmed based on LabView((R))). During standard addition period, a selector valve is switched that alternately for 1 s standard (500 and 1000 ng/l, respectively) and for 9 s sample is transported to the injection valve. Standard acid sample are mixed on the way to the injection valve by dispersion. The instrument has been tested at the German monitoring stations of Schnackenburg and Schmilka at 474.5 and 4.0 km from Czech border, respectively. Details are published at the web: http//www.rzbd. fh-hamburg.de/similar to prmercol.

"Low-budget Flow Injection Device For Teaching. A $10 Six-port Valve"
Anal. Chim. Acta 1998 Volume 366, Issue 1-3 Pages 217-221
Olaf Elsholz*

Abstract: A novel sample introduction valve, based on the tubing clamp operation principle, is described for teaching flow injection analysis It was developed to overcome the shortage of instrumentation in elementary instruction courses in anal. chemical at Fachhochschule Hamburg. The materials for one valve, which can be easily build-up by the students, is <10.
Low cost Education Valve Apparatus