The specific extraction of chromium with tetrabutylammoniumbromide (TBAB) using MIBK as the solvent has been applied for the determination of chromium in water samples [32]. The extracted ion-pair ...

The extraction efficiency for chromium was 86.3% after the 48-h extraction. In the case of arsenic extraction, effective removal was achieved with 3:1 diluted solution after the 36-h extraction and with undiluted solution after the 24-h extraction. The extraction efficiency for chromium was 92.7% with undiluted solution after the 48-h ...

Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr 2 O 3 cannot be extracted after chromite sodium roasting and remains in COPR, wasting valuable Cr resources. In this study, Mg was selectively removed by using (NH 4) 2 SO 4 roasting in …

Solvent extraction system for removal of Cr (VI) from acidic aqueous solutions with trioctylamine in toluene was developed in a microreactor operating in slug …

Generally, extraction of Cr(VI) using calixarenes offers two advantages: one is the stability of the aromatic core structure, which can effectively avoid oxidation of …

However, this high-temperature separation method has yet to attract attention in vanadium-chromium slag vanadium extraction. Hence, a compelling need is to investigate a new, cost-effective, streamlined approach for separating and extracting V and Cr from high-temperature heating V-Cr slag. This innovative approach represents a novel method for ...

A sensitive and simple method for high-performance liquid chromatography (HPLC) determination of traces of chromium species in lake sediments after preconcentration by cloud point extraction (CPE) has been developed. Simultaneous preconcentration of Cr(III) and Cr(VI) in sediment samples was achieved by CPE with 1 …

The extraction of vanadium and chromium from high chromium content vanadium slag by salt roasting and water leaching process has been investigated, which uses mixed sodium salts (Na2CO3 and NaOH ...

The extraction efficiency for CCA elements increased with increasing the concentration of wood vinegar and the extraction conditions, resulting in maximal removal rate of copper (95.7%), followed by arsenic (92.7%) and chromium (86.3%). Since wood vinegar afforded high levels of copper extraction, its use was extended to copper-based ...

Extraction. Chromite ( FeCr2O4 FeCr 2 O 4) is the most commercially useful ore, and is extensively used for extraction of chromium. Chromium is produced in two forms: Ferrochrome by the reduction of chromite with …

The effects of time, composition and history of preparation of the aqueous phase on the liquid-liquid extraction of chromium(III) with Aliquat 336 from the aqueous alkaline solutions containing ...

Extraction of chromium with the TritonX-100 concentration was investigated within the range of 0.1–6.0 ... the concentration of TritonX-100 was chosen as 3.0 g L −1 in order to achieve the optimal surfactant concentration in conjunction with the highest possible extraction efficiency. Download : Download full-size image; Fig. 2.

Chromium-containing vanadium tailings (CCVT), an industrial waste, were utilized to extract chromium efficiently by soda roasting-water leaching process and for the preparation of highly pure chromium oxide. The effect of extraction of chromium under different roasting and leaching conditions were analyzed using X-ray diffraction (XRD) …

3. Effective measurement of chromium reduction and/or loss of the Cr (VI) spike cannot be estimated without an effective extraction protocol for Cr (III) alone 4. The use of stable chromium isotope labels will correct for interconversion either in the extraction or analysis processes up to 80% of the conversion of the spike 5.

Introduction. Minerals are essential nutrients for the body and chromium is one of them. Cr with symbol "Cr" with a molecular weight of 51.9961 +/- 0.0006 u occupying allotted space number 24 in Mendeleev table [].Out of all forms of Cr compounds, trivalent Cr is the most stable form in a biological system and found in food, and hexavalent is a …

The chief ore of chromium is chromite ore. Extraction of chromium metal from chromite ore. The extraction of chromium metal from chromite ore consists of the following steps. 1. Concentration. The crushed ore is concentrated by gravity separation method. 2. Conversion of the concentrated chromite ore into Na2CrO4.

4. Conclusions. The finding showed that PGPR inoculation with plants (P. putida) increased plant growth and metal uptake, however microbe-assisted phytoremediation enhance the Cr accumulation and reclaim the Cr toxic soils.Our study demonstrated that the growth promoting effect of PGPR having ACCD activity was …

The results demonstrated that 99.67% chromium could be extracted after six-stage countercurrent extraction, almost all impurity ions such as Na, V, Al and Mg could be removed from the loaded ...

We developed a new sequential extraction procedure and optimized the partitioning of chromium in iron (oxyhydr)oxide-rich laterites, allowing us to better …

A procedure using disposable pipette tips adapted for solid-phase extraction, known as DPX‑SPE, was used as an alternative way for the chromium determination in wastewater samples.

1. Introduction. Chromium (Cr) resource is extensively used in electroplating, stainless steel manufacturing, and leather tanning (Barnhart, 1997, Fang et al., 2018).China is lack of Cr resource (Peng et al., 2021); thus, the Cr-containing tailings resulted from other resource extraction processes are essential in China (Gu et al., 2021, Ibraev et al., …

One of the difficulties in performing speciation analyses on solid samples is finding a suitable extraction method. Traditional methods for extraction of hexavalent chromium, Cr(VI), in soils, such as SW846 Method 3060A, can be tedious and are not always compatible with some determination methods. For example, the phosphate and …

Here we report a viable strategy to efficiently extract Cr from four different Cr-containing wastes (chromium ore processing residue, tannery sludge, electroplating sludge and stainless steel slag) by a …

Abstract. A sensitive and simple method for high-performance liquid chromatography (HPLC) determination of traces of chromium species in lake …

If carbon and Cr2O3 are combined in a molar ratio of 3:1 and subjected to increasing temperature, a number of oxidation-reduction reactions will ensue that will produce first a series of chromium carbides and finally, at 2,080 °C (3,775 °F), pure chromium and carbon monoxide. (This will … See more

The results demonstrated that 99.67% chromium could be extracted after six-stage countercurrent extraction, almost all impurity ions such as Na, V, Al and Mg could be removed from the loaded ...

In the present work an attempt has been made to extract Cr (VI) through emulsion liquid. surfactant membrane (or, emulsion liqui d membrane-ELM) from it's acidic solution using alamine-336 and ...

The solvent extraction of hexavalent chromium from acidic aqueous solutions by trioctylamine has been developed in a slug flow microreactor to resolve some drawbacks of conventional contactors. The employed microreactor had a T-shaped junction and a circular microchannel with an inner diameter of 0.7 or 1.0 mm. Excellent …

1. Introduction. Membrane extraction technology with simultaneous extraction and stripping has attracted much attention in the field of separation due to its high selectivity, greenness, and energy saving [1], [2]pared with supported liquid membranes, polymer inclusion membrane (PIM) has emerged as the most promising …

Liquid-liquid extraction of chromium (VI) from synthetic waste solution using Alamine 336/kerosene was investigated. The extraction conditions were evaluated by varying the experimental parameters.