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Hexavalent chromium is a toxic metal, known to cause several health problems and is a carcinogen. Exposure to hexavalent chromium can cause irritation and problems in the respiratory tract, stomach, and small intestine. It is linked to several cancers, such as lung cancer, oral cancer, and intestinal cancer. [11]
Hexavalent chromium (chromium(VI), Cr(VI), chromium 6) is any chemical compound that contains the element chromium in the +6 oxidation state (thus hexavalent). [1] It has been identified as carcinogenic, which is of concern since approximately 136,000 tonnes (150,000 tons) of hexavalent chromium were produced in 1985. [ 2 ]
Average hexavalent chromium levels in Hinkley were recorded as 1.19 parts-per-billion (ppb), with an estimated peak of 20 ppb. Based on the PG&E Background Study, the PG&E Topock Compressor Station averaged 7.8 ppb and peaked at 31.8 ppb. [33] The proposed California health goal for hexavalent chromium was 0.02 ppb in 2011. [34]
Chromium toxicity refers to any poisonous toxic effect in an organism or cell that results from exposure to specific forms of chromium—especially hexavalent chromium. [1] Hexavalent chromium and its compounds are toxic when inhaled or ingested. Trivalent chromium is a trace mineral that is essential to human nutrition.
Chromium compounds are compounds containing the element chromium (Cr). Chromium is a member of group 6 of the transition metals. The +3 and +6 states occur most commonly within chromium compounds, followed by +2; charges of +1, +4 and +5 for chromium are rare, but do nevertheless occasionally exist. [3] [4]
Hammer Technologies Inc. (also known as Hammer, formerly known as Empirix Inc.) is a privately held company which designs and manufactures service assurance testing and monitoring equipment for IP-based communications networks such as Voice-over-Internet-Protocol (), IP Multimedia Subsystem (IMS)-based, next generation network and 5G wireless networks.
ChemRisk is a Delaware Limited Liability Company, a for-profit scientific consulting firm headquartered in San Francisco, California, that is part of Cardno ChemRisk. [1] [2] ChemRisk founder and former president, Dennis Paustenbach, "has long been an expert witness and top consultant" to "scores of companies in the chemical, energy and medical products industries" facing lawsuits over ...
The latest modern development occurred in the 1980s, with the new generation of alkaline, cyanide-free zinc. Recent European Union directives ( ELV / RoHS / WEEE ) [ 3 ] prohibit automotive, other original equipment manufacturers (OEM) and electrical and electronic equipment manufacturers from using hexavalent chromium (CrVI).
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