Preconcentration and speciation of chromium in a sequential injection system incorporating dual mini-columns coupled with electrothermal atomic absorption spectrometry

Fast, green and effective chromium bio-speciation using Sepia pharaonis endoskeleton nano-powder

“…This step will also eliminate the matrix effect. Various conventional and recent miniaturized methods such as chemical co-precipitation (Krishna et al 2004;Uluozlu et al 2009) membrane extraction (Safari et al 2013), ion exchanging by resin (Narin et al 2008;Zou et al 2008;Sacmacı et al 2012), cloud point extraction (CPE) (Diniz and Tarley 2015;Wang et al 2010;Matos et al 2009), solid-phase extraction (SPE) (Jia et al 2016;Chen et al 2014;Wu et al 2012;Amin and Kassem 2012) and dispersive liquid-liquid micro-extraction (DLLME) (López-García et al 2013;Wen et al 2013;Yousefi and Shemirani 2013) have been developed for separation and enrichment of chromium species. Of these methods, SPE is the most widely employed procedure for the study of chromium speciation, particularly in water samples (Das et al 2012).…”

Utilization of Modified Corn Silk as a Biosorbent for Solid-phase Extraction of Cr(III) and Chromium Speciation

“…A variety of adsorption materials are used for adsorbing Cr(III) and/or Cr(VI) selectively, such as multiwalled carbon nanotubes, 10,11 modified silica gel, 12 resin, 2,5 ion exchanger, 13 zeolite, 14 and biosorbent. [15][16][17] Biomaterials as sorbents for the adsorption of heavy metals have attracted extensive attention during the last few years. 1,[18][19][20] Various biomaterials, such as animalcule, 17 the root and leaf of plants, skin and shell of fruit, and agricultural waste, have been extensively explored due to their extensive availability and low cost.…”

“…[15][16][17] Biomaterials as sorbents for the adsorption of heavy metals have attracted extensive attention during the last few years. 1,[18][19][20] Various biomaterials, such as animalcule, 17 the root and leaf of plants, skin and shell of fruit, and agricultural waste, have been extensively explored due to their extensive availability and low cost. For example, brown seaweed, 21 coconut coir, 22-24 tea waste, 25 hazelnut shell, 26 Bael fruit shell, 27 ponkan mandarin peel 28 and a variety of agricultural waste 29,30 all show excellent adsorption performance for heavy metals.…”

Study on Multi-walled Carbon Nanotubes On-line Separation/ Preconcentration of Chromium(III) and Chromium Speciation

“…Various new solid-phase extraction materials have been used for chromium speciation, such as modified silica gel, 5 resin, 6 ion exchanger, 10 diatomite, 11 polytetrafluoroethylene (PTFE), 12 zeolite, 13 oxides 14 and biosorbent. [15][16][17] Out of all the options, carbon nanotubes (CNTs) as an employed novel adsorbent has recently been widely investigated due to its unique properties. [18][19][20][21][22][23] Tuzen et al 24 have established a solid-phase extraction procedure for chromium speciation based on the Cr(VI)-ammonium pyrrolidine dithiocarbamate (APDC) chelate on multi-walled carbon nanotubes (MWCNTs).…”