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Thin-layer chromatographic separation of phenols with buffered mobile phases containing cationic surfactants

Mohammad A., Anwar S., Iraqi E., Khan I. A.

Acta Chromatographica

2000

No. 10

195-213

The retention behaviour of nineteen phenols has been examined on plain and ethylenediamine tetraacetic acid (EDTA)-impregnated silica gel layers developed with buffered solutions of cetyltrimethylammonium bromide (CTAB). The effect of CTAB concentration and the nature of other additives (alcohols of different carbon-chain length and acetonitrile) on the RF value (or mobility) of the phenols was studied. Among the additives investigated, 5% methanol was found most suitable. Good separations of phenols were possible with 1% CTAB in 50:50:8 (v/v) 0.04 M boric acid–0.04 M phosphoric acid–0.24 M NaOH as mobile phase. Some important separations were achieved experimentally both on plain silica and on EDTA-impregnated layers.

Detection, identification and separation of certain heavy metals on silica gel - supported tin(IV) arsenosilicate layers

Mohammad A., Anwar S., Iraqi E.

Chemia Analityczna

1999

Vol. 44, No. 2

195-200

Separation of metal ions was carried out on thin layers of silica gel, mixed silica gel -tin(IV) arsenosilicate, and the latter impregnated with tributylaJnine in methanol. Good results were obtained using mobile phases containing methanol. The RF values for 13 ions were given as well as examples of their separation.

Rozdzielanie jonów metali prowadzono na cienkich warstwach żelu krzemionkowego, mieszanego żelu krzemionkowego i arsenokrzemianu cyny(IV). oraz na takich war-stwach impregnowanych roztworami tributyloaminy w metanolu. Dobre wyniki uzyska-no stosując fazy ruchome zawierające kwas mrówkowy. Podano wartości RF dla 13 jonów metali, oraz przykłady rozdzielania ich mieszanin.