Speciation analysis of inorganic chromium in wastewater is of great significance for the monitoring of
environmental pollution. In this work, N,N-bis(2-aminoethyl)ethane-1,2-diamine functionalized poly
(chloromethyl styrene-co-styrene) was synthesized, characterized and used as the adsorbent to preconcentrate
chromium species in environmental waters by on line solid-phase extraction (SPE). The trace
speciation analysis of Cr(III) and Cr(VI) in wastewater has been used by short-column high-performance
liquid chromatography hyphenated to inductively coupled plasma spectrometry (HPLC–ICP-MS) after online
SPE. Cr(III) and Cr(VI) have been adsorbed on the anion exchange column after transforming the
cationic Cr(III) to an anionic [Cr(III)–EDTA] complex devoid of re-dox reagent, and then eluted rapidly
(within seconds) with a very low concentration of tetrabutylammonium hydroxide (TBAH) solution. This
method provides a reliable on-line preconcentration method and detection coupled technique. Under the
optimized conditions, high enrichment factors have been obtained for Cr(VI) and [Cr(III)–EDTA] with
30 mL sample solution up to 105 and 128, respectively. The low detection limits of 0.0068 ng mL1 and
0.0041 ng mL1
, with the relative standard deviations (RSDs) of 4.3% and 3.6% were obtained for Cr(VI)
and [Cr(III)–EDTA], respectively. The developed method was validated by analyzing Certified Reference
Materials GSBZ50027-94, and the spike tests were also performed. At the same time, thanks to the merit
of simple operation, rapid adsorption/desorption dynamics, high enrichment and low LODs, the established
method was applied to analyze three wastewater samples from different discharge port.