On‐site sampling of inorganic contamination on the metal surface and analysis with capillary electrophoresis

Abstract

Pipes are the primary structural elements used for transporting fluid in various industries. The most common damage mechanism is corrosion, which occurs in pipes surface of turbine. The corrosive compounds for pipes are inorganic ion (Na + , Cl − , NH 4 + , NO 3 − , etc.) and grinding oil. For rapid and quantitative detection of inorganic ions on site, more reliable and reproducible analytical methods are demanded. A highly efficient solid-liquid sampling collection system is introduced in this work. Papering on the sample surface, inorganic cations and anions were simultaneously collected and analyzed by capillary electrophoresis with indirect ultraviolet detection. As a result, five cations (Na + , K + , NH 4 + , Ca 2+ , Mg 2+ ) and three anions (Cl − , NO 3 − , SO 4 2− ) were completely separated. The efficiency of the sampling and ability of capillary electrophoresis analysis were presented by the determination of tracelevel (mg/m 2 ) contaminants. The recoveries of cations and anions on the paper from metal surface were between 86.6 and 107.2%, and the relative standard deviations were less than 12.85%. K E Y W O R D S capillary electrophoresis, inorganic contamination, metal surface analysis, sampling J Sep Sci 2019;42:1593-1599.

Development of a background electrolyte for the determination of inorganic cations in high ionic strength samples by capillary electrophoresis with indirect UV-absorption detection

“…Specifically for cation analysis, two main detection techniques have been reported in CE; capacitively-coupled contactless conductivity detection (C4D) [6][7][8][9][10][11] and single wavelength indirect UV-absorption detection [12][13][14][15][16][17][18]. In the latter mode, an absorbing co-ion, called the probe or chromophore probe, is added to the background electrolyte (BGE).…”

A Fluidic Isolation-Assisted Homogeneous-Flow-Pressure Chip-Solid Phase Extraction-Mass Spectrometry System for Online Dynamic Monitoring of 25-Hydroxyvitamin D3 Biotransformation in Cells

“…Microfluidic Chip-coupled mass spectrometry (Chip-MS) is an emerging tool for online biomolecule detection and cell studies. − Apart from benefits from microfluidic chip such as enabling precisely regulation cellar environment and flexibility in manipulation, and mass spectrometry facilitating highly accurate molecules determination, , the Chip-MS platform has extensive applications in pharmacology, proteomics, metabolomics, and single cell analysis. , Despite of the advantages of Chip-MS, for enhanced sensitivity detection, a cell matrix needs to be removed or separated to avoid a matrix effect in the demands for sample pretreatments prior to MS, , such as purification, extraction, and enrichment.…”