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In this research, a simple method was developed for the separation and determination of l-tryptophan in aqueous solutions. The method consists of a solid-phase extraction (SPE) cleanup system utilizing a column packed with nickel–aluminum layered double hydroxide as a nano-sorbent, followed by a spectrofluorometric detection step. Some factors influencing the SPE efficiency, including pH, the...
A selective solid phase extraction method, based on nano-structured Mg–Al–Fe(NO 3− ) ternary layered double hydroxide as a sorbent, is developed for the pre-concentration of ultra-trace levels of arsenic (As) prior to determination by electrothermal atomic absorption spectrometry. It is found that both As(III) and As(V) could be quantitatively retained on the sorbent within a wide pH...
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