Speciation, adsorption and determination of chromium(III) and chromium(VI) on a mesoporous surface imprinted polymer adsorbent by combining inductively coupled plasma atomic emission spectrometry and UV spectrophotometry

Abstract

In the present study, a Cr(III)-imprinted polymer (Cr(III)-IIP) was prepared by an easy one-step sol-gel reaction with a surface imprinting technique on the support of silica mesoporous material. A new SPE method for the speciation, separation, preconcentration, and determination of Cr(III) and Cr(VI) by inductively coupled plasma atomic emission spectrometry and UV on the mesoporous-imprinted polymer adsorbent was developed. The structure of the imprinted polymer was characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, transmission electron microscopy, and nitrogen adsorption-desorption isotherms. The adsorption kinetics, thermodynamics behavior, and recognition ability toward Cr(III) on Cr(III)-IIP and nonimprinted polymer were compared. The results showed that Cr(III)-IIP had higher selectivity and nearly a two times larger Langmuir adsorption capacity (38.50 mg/g) than that of NIP. The proposed method has been successfully applied in the determination and speciation of chromium in natural water samples with satisfactory results.

Optimization of species stability and interconversion during the complexing reaction for chromium speciation by high-performance liquid chromatography with inductively coupled plasma mass spectrometry

“…The most sensitive method is anion exchange based chromatography with ICP-MS, which enables reliable speciation determination of chromium in various sample matrices and wide pH range from acidic to alkaline [17]. The common form of chromium in water samples is chromate (CrO 4 2− ) for Cr(VI) and chromic ion (Cr 3+ ) for Cr(III). Normally, to simultaneously determine both species of chromium in a single chromatographic run, a strong chelating agent such as EDTA was induced to form anionic complex with chromic ion [19][20][21].…”

“…Because of its wide use in manufacturing processes such as leather tanning, metal melting, electroplating, and chromate and chrome pigment production, large amounts of chromium compounds are released to the environment, which may contaminate source water and drinking water [2][3][4]. Cr(III) is considered to have low toxicity and is an essential trace nutrient for humans, and it plays an important role in lipid, glucose, and protein metabolism [5] …”

Preparation of a K+‐imprinted polymer for the selective recognition of K+ in food samples

“…Ion‐imprinted polymers (IIPs) are similar to MIPs, but they recognize metal ions after imprinting and retain all virtues of MIPs . Several recent literatures have reported the synthesis of IIP materials and their use in separation of different metal ions .…”

Determination of hexavalent chromium in traditional Chinese medicines by high-performance liquid chromatography with inductively coupled plasma mass spectrometry

“…As a consequence of intensive industrial activities, huge amounts of Cr‐rich waste materials are generated that also represent an environmental burden. The toxicological studies have indicated that the role and impact of Cr on the environment and living organisms depend primarily on its chemical form . Trivalent chromium, Cr(III), is considered as an essential micronutrient for mammals, while hexavalent chromium, Cr(VI), is highly toxic due to its mutagenic and carcinogenic properties.…”