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Thin layer chromatographic separation of cobalt from nickel on impregnated silica gel layers: quantitative determination by digital image analysis

“…The TLC separation of Co 2 + from Ni 2 + [ 12 ] followed by the quantitative determination by spectrophotometry [ 13,14 ] was reported and it is observed that the majority of the chromatographic systems used for the selective separation of Co 2 + from Ni 2 + comprised multicomponent mobile phases and generally impregnated adsorbents [ 15 ] containing ion exchange gels. One of the reliable combination of mobile phase systems consisting dimethylamine with acetone as well as methanol [16 ] resulted the separation of Co…”

Speciation of Chromium by High-Performance Thin-Layer Chromatography with Direct Determination by Laser Ablation Inductively Coupled Plasma Mass Spectrometry

“…Speciation of Cr by the coupling of ICPMS and chromatographic methods (primarily ion chromatography) is an active area of research. , High-performance thin-layer chromatography (HPTLC) is a relatively simple and inexpensive separation technique, routinely used in many laboratories to assess compound purity. Although more commonly used for the separation of organic compounds, procedures for the separation of Cr 6+ and Cr 3+ on silica gel plates have been developed using a mixture of methanol, dimethylamine, and formic acid, but only semiquantitative determination was achieved through spot area measurements . Other heavy metal cations (Ni 2+ −Pb 2+ , Cd 2+ −Cu 2+ , Ni 2+ −Zn 2+ , Co 2+ −Fe 3+ , Ni 2+ −Bi 3+ , and more) have also been separated on TLC plates with aqueous mobile phases containing the nonionic surfactant Triton X-100 (Tx-100) …”

“…Although more commonly used for the separation of organic compounds, procedures for the separation of Cr 6+ and Cr 3+ on silica gel plates have been developed using a mixture of methanol, dimethylamine, and formic acid, but only semiquantitative determination was achieved through spot area measurements. 3 Other heavy metal cations (Ni 2+ -Pb 2+ , Cd 2+ -Cu 2+ , Ni 2+ -Zn 2+ , Co 2+ -Fe 3+ , Ni 2+ -Bi 3+ , and more) have also been separated on TLC plates with aqueous mobile phases containing the nonionic surfactant Triton X-100 (Tx-100). 4 Several groups have explored the direct coupling of TLC with MS, mainly for the analysis of organic compounds by matrixassisted laser desorption/ionization-mass spectrometry, but the process is complicated by the necessity of adding a matrix layer to the TLC plate.…”