The toxicology of chromium with respect to its chemical ...

Oct 01, 2010· 1. Introduction. Chromium is an unusually challenging element in the context of environmental health assessment. Trivalent chromium (Cr + 3) is an essential trace element while hexavalent chromium (Cr + 6) is a human respiratory (ATSDR, Agency for Toxic Substances Disease Registry, 2000) and ingestion carcinogen (NTP, National Toxicology Program, 2008) and a contact …

Chromium as an Environmental Pollutant: Insights on ...

Chromium (Cr) is a metallic element belonging to the first transitional series of the periodic table. Elemental chromium has a CAS Registry Number of 7440-47-3. The three most stable forms in which chromium occurs in the environment are the 0 (metal and alloys), +3 (trivalent chromium), and +6 (hexavelent chromium) valence states.

1988 OSHA PEL Project - Chromium Metal | NIOSH | CDC

Chromium (Cr) is a metallic element belonging to the first transitional series of the periodic table. Elemental chromium has a CAS Registry Number of 7440-47-3. The three most stable forms in which chromium occurs in the environment are the 0 (metal and alloys), +3 (trivalent chromium), and +6 (hexavelent chromium) valence states.

Hexavalent chromium in house dust — A comparison between ...

Product Overview Manufacturing Process Applications Specification Chromium Sulphate is an inorganic colouring compound with molecular formula Cr(OH)SO4.Basic chromium sulphates are the mixture of various chromic sulphates including chromium hydroxide sulphate Cr(OH)SO4. It is a water soluble compound and mostly used for leather tanning. It is the most efficient tanning agent.

Chromium: Journal of Toxicology: Clinical Toxicology: Vol ...

A flow-through pilot-scale system was tested for removal of Cr(VI) from contaminated groundwater in Glendale, California. The process consisted of the reduction of Cr(VI) to Cr(III) using ferrous sulfate followed by coagulation and filtration. Results indicated that the technology could reduce influent Cr(VI) concentrations of 100 μg L-1 to below detectable levels and also remove total Cr (Cr ...

(PDF) In Situ Bioremediation of Chromium (VI) In a ...

This study assessed chromium pollution in soils, plants, water and slag from a ferrochrome smelting plant in Gweru, Zimbabwe. Speciation of chromium in plant leaves, soil and slag samples was carried out by selective leaching of Cr (VI) using a sodium carbonate leaching procedure prior to the spectrophotometric determination of Cr (VI). Total Cr and Cr (III) concentration in the samples were ...

Hexavalent Chromium - niehs.nih.gov

Absorption of inorganic, trivalent and hexavalent chromium following oral and intrajejunal doses in rats. Acta Vet Hung 49:203-209 11402649. Crossref, Medline, Google Scholar; Food and Drug Administration. 1987. Good laboratory practice regulations. Final rule. 21 …

(PDF) The reduction of hexavalent chromium by sulphite in ...

Nov 11, 2005· The chromium content in slags is 2–12%, in oxide and metal form. The slag/metal amount ratio in smelting varies from 1.0 to 1.8, depending on raw materials . Slag is discarded as a waste material in enormous quantities during the ferrochrome production.

Chromium Compounds - US EPA

The composition and leaching tests of the ferrochrome slag show that the chromium content is high, 1-3%, although leaching under normal conditions is very low. ... to trivalent chromium. Water ...

Chromium as an Environmental Pollutant: Insights on ...

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.

Product | Chromium Sulphate

This study assessed chromium pollution in soils, plants, water and slag from a ferrochrome smelting plant in Gweru, Zimbabwe. Speciation of chromium in plant leaves, soil and slag samples was carried out by selective leaching of Cr (VI) using a sodium carbonate leaching procedure prior to the spectrophotometric determination of Cr (VI). Total Cr and Cr (III) concentration in the samples were ...

Hexavalent Chromium | NIOSH | CDC

In Situ Bioremediation of Chromium (VI) In a Simulated Ferrochrome Slag. ... are desirable since both the hexavalent form of chromium and the trivalent state of arsenic are acutely toxic at high ...

Hexavalent vs. Trivalent Chrome Plating - Electro Chemical ...

Aug 06, 1999· Hexavalent chromium (VI) contaminated local soil when chromium waste slag was part of the fill material present in residential, public, and industrial areas. In some urban areas, about two-thirds of the chromium in air results from the emission of hexavalent chromium from fossil fuel combustion and steel production.

Hexavalent chromium removal by ferrochromium slag ...

Oct 01, 2010· 1. Introduction. Chromium is an unusually challenging element in the context of environmental health assessment. Trivalent chromium (Cr + 3) is an essential trace element while hexavalent chromium (Cr + 6) is a human respiratory (ATSDR, Agency for Toxic Substances Disease Registry, 2000) and ingestion carcinogen (NTP, National Toxicology Program, 2008) and a contact …

[PDF] Speciation of chromium in soils, plants and waste ...

Mar 10, 2017· Hexavalent chromium plating is the traditional method of chromium plating (most commonly known as chrome plating) and can be used for decorative and functional finishes. Hexavalent chromium plating is achieved by submerging substrates into a bath of chromium trioxide (CrO 3) and sulfuric acid (SO 4). This type of chromium plating provides ...

Hexavalent Chromium - Safer Chemicals, Healthy Families

Dec 01, 2013· Chromium release from the ferrochrome slag limits its utilization/disposal. ... It exists in the common oxidation states of hexavalent chromium Cr(VI) and trivalent chromium Cr(III). ... method were carried out for the determination of hexavalent and total chromium in the slag samples. 100 g of granulated and crushed slag samples with size <9.5 ...

Hexavalent Chromium Factsheet

The cytotoxicity of soluble and insoluble hexavalent chromium compounds to fibroblasts is 100‐1000 times greater than that demonstrated by trivalent chromium compounds. In short‐term tests, the hexavalent chromium compounds demonstrated genotoxic effects four times more frequently than did the trivalent chromium compounds.

Hexavalent Chromium Removal by Reduction with Ferrous ...

Although trivalent chromium (Cr III) is commonly found in nature and is an essential nutrient for humans, the hexavalent form is a product of industrial activities. Industries including metal processing, tanneries, chromate production, stainless steel welding, and ferrochrome and chrome pigment production are significant sources of chromium ...

Environmental impact of ferrochrome slag in road construction

Hexavalent chromium (Cr(VI)) is well-known to be a strong oxidizer, and is recognized as a carcinogen. Therefore, it is regulated for drinking water, soil, groundwater and sea by the environmental quality standards all over the world. In this study, it was attempted to remove Cr(VI) ion in a carbonic acid solution by the oxidizing slag that was discharged from the normal steelmaking process in ...

[PDF] Speciation of chromium in soils, plants and waste ...

The cytotoxicity of soluble and insoluble hexavalent chromium compounds to fibroblasts is 100‐1000 times greater than that demonstrated by trivalent chromium compounds. In short‐term tests, the hexavalent chromium compounds demonstrated genotoxic effects four times more frequently than did the trivalent chromium compounds.

Environmental impact of ferrochrome slag in road construction

chromium cement hexavalent chromium suspension hexavalent Prior art date 2002-03-11 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active Application number JP2002065323A Other languages Japanese (ja ...


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