Trace analysis of water with mini-column preconcentration-liquid chromatography

Column Liquid Chromatography

Preconcentration in Inorganic Trace Analysis

Preconcentration in trace analysis lowers the detection limit, simplifies the treatment of a representatIve sample, facilitates calibration, reduces the need for various standard reference samples and frequently involves separation of the matrix in analysis of toxic, radioactive and expensive materials. In this paper, the types of preconcentration are considered and quantitative characteristics...

Analysis of trace atrazine and simazine in environmental samples by liquid chromatography-fluorescence detection with pre-column derivatization reaction.

Coupled with off-line extraction, a pre-column derivatization liquid chromatographic fluorescence detection (LC-FL) procedure was developed for the determination of atrazine and simazine in soil, crop and water samples. Concentrations in real samples were expected to be at or below the low ng/g level, which requires pre-concentration of analytes and improved detection. 4-(2-Phthalimidyl) benzoy...

Analysis of Cordyceps by multi-column liquid chromatography

Cordyceps is a famous traditional Chinese medicine (TCM) that has been used in China for hundreds of years. In the present study a multi-column liquid chromatography (MC-LC) system was developed for the qualitative analysis of macromolecules and micromolecules in Cordyceps. The MC-LC system includes a size exclusion pre-column, a size exclusion column (SEC) and a reversed phase column (RP) whic...

Preconcentration Mini Column Technique For The Determination Of Cu (II) In Water And Alloy Samples With Spectrophotometry

4-amino methyl pyridine anchored silica gel (4-AMPS) was used as a sorbent in a simple sensitive spectrophotometry determination of Cu (II) in various samples using piperazine dithiocarbamate as a color developing agent (λmax 420 nm) at pH 5.0 ± 0.2. Beer’s law was obeyed over the range of 0.2 -13 μg ml-1. The molar absorptivity and Sandell’s sensitivity were 0.5731 × 105 l mol-1cm-1 and 0.0022...