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By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
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Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
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Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
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Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
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Hexavalent chromium Cr(VI) is ranked among the top 16 toxic heavy metals that have harmful effects on human health [2]. Its toxicity includes cancer as well as damage to the kidney and liver, vomiting, diarrhea, hemorrhage, skin irritation, and ulceration [3], [4]. Due to the harmful effects associated with chromium, efficient …
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Hex avalent chromium . Cr(VI) ion is particularly conce rning due to its rapid transport. across cell membranes and reduction t o Cr(III) form. This.
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Section snippets Experiments in stack. Two similar home made lab scale stacks were used (Fig. 1) with different dimensions. The stack consists of n number (n = 9, 39 or 49) of anion and n + 1 number of cation-exchange membranes (Fuji), gasket integrated with spacers (Deukum, 0.28 mm thickness) and two external membranes to …
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The aim of present study was to remediate chromium (Cr)-contaminated soil by Crotalaria juncea in the presence of Pseudomonas fluorescens. Inoculation of P. fluorescens in pot soil grown with C. juncea significantly increased (~2-fold) the water-soluble (Ws) and exchangeable (Ex) Cr contents in contaminated soil under greenhouse …
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This study utilised a mixed culture of Chlorella vulgaris and bacteria from sludge to treat synthetic tannery wastewater (STWW) in modified stirred-tank photobioreactors (MSTPBRs). The MSTPBRs were fabricated locally and operated at irradiance value of 580 µmol/m2s supplied by red light-emitting diodes at 12:12 …
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This article presents a novel method to remove hexavalent chromium from aqueous solution using magnetic microspheres derived from alkali-activated iron-rich copper slag. The microspheres have high adsorption capacity, stability and recyclability, and can be easily separated by a magnetic field. The article also compares the performance …
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Calico CrN (chromium nitride) is an excellent coating that provides lubricity and superior wear and corrosion resistance. Calico CrN has a very low residual stress, which provides for the best adhesion and ductility of any of the PVD coatings. High hardness, low coefficient of friction and the low residual stress of Calico CrN combine to resist ...
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A novel nanocomposite consisting of Fe 3 O 4-loaded tin oxyhydroxy-chloride is demonstrated as an efficient adsorbent for the removal of hexavalent chromium in compliance to the new drinking water regulation.This study introduces a continuous-flow production of the nanocomposite through the separate synthesis of (i) 40 nm Fe 3 O 4 …
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1. Introduction. Chromium contamination in the soil has received great attention in recent years. Cr(VI) is released into soil by various industrial activities, such as chromate manufacturing, electroplating, leather tanning and wood preservation (Reyhanitabar et al., 2012), and agricultural activities, such as sludge and sewage …
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Screening of microorganisms for chromium resistance The isolates were tested for their chromate tolerance at different concentrations (20–200 μ L/mL) in solid agar medium. Three bacteria showed resistance to 100 mg/L of Cr(VI) in nutrient agar media among which Brevibacterium sp. was able to grow to a concentration of 250 mg/L of …
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Among the contaminants, hexavalent chromium (Cr(VI)) is constantly released by various sectors of the industry and is one of the most abundant elements in the world [5–7]. Due to its oxidation, hexavalent chromium (Cr(VI)) and triva-lent chromium (Cr(III)) are the most common ways to be detected. Cr(VI) is highly harmful to human health and can
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Abstract. Electroplating industries discharge heavy metals such as cadmium, chromium, copper, nickel, lead and zinc in their effluents. Cadmium in high concentration in the effluent cause direct ...
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CAS No. 1. Hexavalent chromium (Cr (VI)) compounds are a large group of chemicals with varying properties, uses, and workplace exposures. Hexavalent chromium is harmful to the eyes, skin, and respiratory system. NIOSH considers all Cr (VI) compounds to be occupational carcinogens. Workers may be harmed from exposure to hexavalent …
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The bands at approximately 1380 cm −1 and 1538 cm −1 were related to C-NH 2 stretching and β-sheet secondary structure of amide II respectively, while the stretching band observed at 1110 cm −1 was most likely produced by C-O bonds ... the vast majority of chromium can be removed after separating the post-sorption ABP from the solution ...
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A highly chromate-selective biosorbent with high adsorption capacity was found by examining the chromate adsorption capacities of 48 species of red, brown, or green marine algae sampled from the east coast of Korea. As a result of screening, a red marine alga showed excellent adsorption characterist …
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In the natural environment, chromium exists mainly in the form of Cr(III) and Cr(VI), while Cr(VI) is much more mobile, soluble and poisonous than Cr(III) [4], [5]. Cr(VI) can cause a series of health problems from simple skin irritation to lung carcinoma [6]. Therefore, the removal of Cr(VI) from water resources has become an urgent ...
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The reductants for chemical remediation of Cr(VI) contaminated soil can be roughly divided into three categories, namely, iron-based reductants, sulfur compounds and organic amendments (Fig. 1).For example, organic amendments, such as humic acids (Aldmour et al., 2019), tartaric acid and isopropyl alcohol (Brose and James, 2013), can …
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CHROMIUM, HEXAVALENT: METHOD 7600, Issue 2, dated 15 August 1994 - Page 3 of 4 additional 1 to 2 mL 0.5 N H 2SO 4. Discard the filters. Start reagent blanks at this point. d. Filter the solution through a moistened PVC filter in a Buchner funnel to remove interferences from suspended dust. Collect the filtrate in a clean centrifuge tube. Rinse the
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The optimization of the sorbent dose and the time of adsorption of chromium on MAG was carried out. The results are shown in Table 4. Table 4. Adsorption efficiency of chromium on graphite, depending on heating time and sorbent dose. 15 ml of 50 mg·l −1 Cr (VI) solution, pH 6.3, heating at 90°С. Sorbent Dose, g.
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Chromium is a transition metal with a wide range of applications in leather tanning, textile, electroplating, stainless steel production, inorganic chemical production and wood preservation ...
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The ICP is changing the charge for all sources of chromium to the +1 oxidation state, mostly. This results in a majority of your chromium counts being read on masses 52 and 53 using the assumption that the charge is +1. If some of the chromium changes to the +2 state in the plasma, the resulting mass to charge ratio lands on …
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A high-chromate-selective biosorbent with high adsorption capacity was sought by examining the chromate adsorption capacities of 48 species of red, brown, or green marine algae sampled from the east coast of Korea. Screening showed a red marine alga to have the most excellent adsorption characteristics among them, and it was identified as …
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Material Safety Data Sheet Section 1: PRODUCT AND COMPANY INFORMATION Product Name(s): ... amounts of crystalline silica and he)avalent chromium which are by LARC and NTP as known human carcinogens- ... or sensiüvity to chromium can be aggravated by e)çosure. Page 2 of 6 Re..ed: 0301/08 . FARGE NORTH AMERICA Section 4: FIRST …
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Chromium has several oxidation states ranging from +2 to +6, with the two most common and stable states are trivalent Cr (III) and hexavalent Cr(VI) (Shokri Khoubestani et al., 2015). Cr(VI) is ...
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A novel approach to Cr(VI)-contaminated wastewater treatment was investigated using microbial fuel cell technologies in fed-batch mode. By using synthetic Cr(VI)-containing wastewater as catholyte and anaerobic microorganisms as anodic biocatalyst, Cr(VI) at 100 mg/l was completely removed during 150 h (initial pH 2). The …
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Occupational exposure to hexavalent chromium can occur from inhalation of dusts, mists, or fumes containing hexavalent chromium, or from eye or skin contact. The following references provide information on exposure limits and analytical methods used to evaluate hexavalent chromium exposure. OSHA Cr (VI) standards for general industry ( 1910. ...
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Hexavalent chromium ads orption ca pability ont o carbon blac k: kinetic and thermody namic aspe cts. Fig. 6. Kinetic model for the adsorption of Cr (VI) ions (c = 200 mg/L) onto the CB: a) pseudo ...
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Hexavalent chromium (Cr(VI)) in water is a proven carcinogen to different internal and external organs of the living organisms. There are different human activities incorporated to the ...
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Trivalent chromium (Cr3+) is naturally occurring, environmentally pervasive and a trace element in man and animals. Hexavalent chromium is anthropogenic from a number of commercial and industrial sources. It readily penetrates biological membranes and has been identified as an industrial toxic and cancer substance.
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2008). Hexavalent chromium stock solutions (1,000 mg/l) were prepared by dissolving 2.83 g analytical grade K 2Cr 2O 7 in 1,000 ml of deionized, distilled water. Standard solutions of the desired initial Cr(VI) concentration were prepared by diluting the stock solution into required concentrations. All cell transfers and inoculation procedures ...
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The estimation of chromium was done for the collected supernatant. The aforesaid Cr (VI)-containing media was also included for estimation of chromium at same intervals. 1,5-diphenylcarbaide (DPC) reagent was used to measure Cr (VI) in the supernatant . Acid digestion of the sample was done, and the total chromium was …
Details1. Introduction. Chromium is a highly poisonous, mobile, and carcinogenic heavy metal, which is listed as one of the top-priority contaminants by the USEPA (Soliemanzadeh and Fekri, 2017).Chromium is widely used in various industrial processes such as chrome alloy production, dyeing industry, chrome electroplating, metal finishing, …
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