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PCBs are derived from biphenyl, which has the formula C 12 H 10, sometimes written (C 6 H 5) 2.In PCBs, some of the hydrogen atoms in biphenyl are replaced by chlorine atoms. There are 209 different chemical compounds in which one to ten chlorine atoms can replace hydrogen at
Bioremediation of PCBs is the use of microorganisms to degrade PCBs from contaminated sites, relying on multiple microorganisms' co-metabolism. Anaerobic microorganisms dechlorinate PCBs first, and other microorganisms that are capable of doing BH pathway can break down the dechlorinated PCBs to usable intermediates like acyl-CoA or carbon ...
The PCBs came from the company's two capacitor manufacturing plants at Hudson Falls and Fort Edward, New York. [1] The U.S. Environmental Protection Agency (EPA) banned the manufacture of PCBs in 1979. [9] The bulk of the PCBs in the river were manufactured by Monsanto Co. under the brand names Aroclor 1242 and Aroclor 1016. [10]
Exposure to the coplanar stereoisomer 3,3',4,4',5,5'-hexabromobiphenyl (but not the non-coplanar stereoisomer) in genetically susceptible mice is known to cause immunotoxicity and disorders related to the central nervous system, and even at doses as low as 2.5 mg/kg, excess neonatal fatalities are observed (LD 50 is from 5–10 mg/kg). [1]
[6] Dioxins are extremely stable and consequently tend to accumulate in the food chain. They are eliminated very slowly in animals, e.g. TCDD has a half-life of 7 to 9 years in humans. [4] [7] [8] Incidents of contamination with PCBs are often reported as dioxin contamination incidents since these are of most public and regulatory concern. [9] [1]
2001 [6] none none A: Elimination Endosulfan: 115-29-7, 959-98-8, 33213-65-9 2011 [11] As allowed for the parties listed in the register of specific exemptions Crop-pest complexes A: Elimination Endrin: 72-20-8 2001 [6] none none A: Elimination Heptachlor: 76-44-8 2001 [6] none none A: Elimination Hexabromobiphenyl: 36355-01-8 2009 [7] none ...
Cost-of-living in America is still out of control — use these 3 'real assets' to protect your wealth today, no matter what the US Fed does or says This article provides information only and ...
The July 2023 Chicago Area Flood was caused by a heavy rainfall that occurred on July 2, 2023, in the Chicago Metropolitan Area of northeastern Illinois. Rainfall up to 9.0 inches (23 cm) occurred over an 18-hour period; the majority occurred from early in the morning to late in the afternoon. [ 1 ]