Membrane-controlled reagent-delivery systems – a new approach for the continuous production of reagent and standard solutions |
| |
Authors: | H Albus B Neidhart |
| |
Institution: | (1) Institute of Physical and Chemical Analysis, GKSS Research Center Geesthacht GmbH, Max-Planck-Str., 21502 Geesthacht, Germany e-mail: healbus@comdisco.com, e-mail: bernd.neidhart@gkss.de, DE |
| |
Abstract: | A new simple and robust system for the production of standard solutions, based on the mass-transfer of analytes through membranes,
is described. The device consists of a cone-shaped reservoir vessel, filled with a concentrated solution of the analyte and
separated from a liquid acceptor stream by a membrane. Mass-flow from donor to acceptor solution is controlled by the mass-transfer-affecting
properties of the active membrane area, which is determined by the hole in a template (diameter 0.8 mm) placed between the
membrane and the acceptor-channel. Using nitrate as model analyte and a track-etched membrane filter (pore size 0.1 μm) dilution
factors up to 2,400,000 with long-term reproducible accuracy of < 2% have been achieved. Adjustment of a requested concentration
is possible by varying either the flow rate of the acceptor stream or the concentration of the reservoir solution.
Received: 22 November 2000 / Revised: 5 March 2001 / Accepted: 7 March 2001 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|