초록 ▼

A procedure and an apparatus for the quantitative determination of cations and anions by ion chromatography is described which can be used, for example, to test drinking water, river water or water in drains. The sample is injected into a buffer stream which comes through a chromatography column. Th

A procedure and an apparatus for the quantitative determination of cations and anions by ion chromatography is described which can be used, for example, to test drinking water, river water or water in drains. The sample is injected into a buffer stream which comes through a chromatography column. The eluate from the column is measured in a conductivity detector, the background being suppressed in a new cell. The cell consists of two ion exchange membranes which are not permeable to the ions to be measured and two electrodes which set up an electric field across the membranes. The highly dissociated ions of opposite charge in the eluate are exchanged into compounds of low conductivity and removed from the cell.

대표청구항 ▼

A method for quantitatively determining cations or anions in a solution by ion chromatography comprising the steps of: injecting a sample of the solution into a buffer stream; conducting the sample containing buffer stream onto a chromatography column; suppressing the background ions in the eluate f

A method for quantitatively determining cations or anions in a solution by ion chromatography comprising the steps of: injecting a sample of the solution into a buffer stream; conducting the sample containing buffer stream onto a chromatography column; suppressing the background ions in the eluate from the column by passing the eluate through a cell including (a) two ion exchange membranes which are impermeable to ions of the same charge as those to be determined, (b) two electrodes spaced on opposite sides of the membranes and generating an electric field across the direction of flow of the eluate, and (c) a first and a second electrolytic solution flowing in the respective spaces between the adjacent electrodes and membranes, such that in the eluate one ion of the strongly dissociated electrolyte forms water or a weakly dissociated electrolyte of low conductivity while, under the influence of the electric field, the other ion of opposite charge of the strongly dissociated electrolyte passes through one of said membranes and is removed by the electrolyte solution of the other side of this membrane; and measuring the conductivity of the eluate from the cell to determine cations or anions.