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fire retardant catfish?

by:Qihao      2019-09-01
It may sound like the dream of a barbecue chef: when their fat splashes onto an overheated charcoal, there is no fire and burnt fish.
But the fact is not that attractive.
Although many AmericansS.
Fish contain fire-proof agents that do not protect your barbecue food from burning.
In fact, these compounds, named as PBDEs, are industrial contaminants.
New data suggest that PBDEs may be hormones
Imitate poison-a nutritional nightmare, not a cooking dream.
For many environmental scientists, PBDEs is just the latest addition to the more and more alphabet soups that pollute the toxic substances that our food supplies.
Like DDT, PCBs, PBBs, and HCH, these organic chemicals can be dissolved in lipids.
Once they enter the environment, they accumulate in the insulating fat of animals-fish, birds and even polar bears.
Eating contaminated fish may bring their accumulated polyfluoride storage to the table.
At the very least, this is a question raised by Robert C.
Hale and his colleagues at the Virginia Institute of Marine Science (VIMS)
At Gloucester Point in December1 .
Hale and his colleagues stumbled upon contaminants in the Virginia river after being asked to analyze whether the fish in these waters contained PCBs (
PCBs).
Hale recalled that their analysis also showed the concentration of PBDEs on the roof.
The main type detected is penta-
Molecules containing four to six atoms of Bromo. Because U. S.
In the production of polyurethane foam, manufacturers rely on these pentas, Hale drove to the river
Hope to see the sampling location of the main foam-
Production plant.
But we were confused because all we found was a boat, trees and some farms, he said.
In fact, Hale said, you can never guess, look at the place where we have seen the highest fish [1]PBDE]
Concentration, there will be no pollution problem.
In conclusion, the VIMS team collected 332 fish from 133 locations in Roanoke and Dan River Basin.
These fish include 33 different freshwater species such as sunfish, white bass, carp and catfish.
Totally 89% of fish contains detectable BDE-
47, a component of penta preparation.
Concentration of more than 100 micrograms per kilogram (mg/kg)
More than half of the tissue sampled fish, as well as some tissues collected from 16 sep arate sites, have a residue level of at least 10 times.
Like other fats --
Soluble contaminants, the largest and oldest animal of this PBDE, present the heaviest accumulation.
Hale said that this probably reflects the gradual accumulation of flame retardant substances in animals by eating moderately contaminated prey.
One or more types of PCB are usually shown in about 97% of the U. S. fish. DDE, a hormone-
The decomposition products of DDT were simulated, and almost as much pollution was caused.
However, in more than half of the fish tested by VIMS scientists, the concentration of PBDE is called BDE-
More than 47 PCB
153-the most common PCB in regional waters. Detectable BDE-
The 47 concentrations also exceeded 29% of the fish samples.
Indeed, a carp ()
Scientists analyzed the establishment of a new world record for PBDE pollution-900 mg/kg tissue. The decades-
The old fish has lived in the village of Virginia\'s little sea River.
Until this new discovery, a Swedish bass has always been a dubious title for most PBDE.
36,900 mg/kg pollution.
However, Hale observed that the really disturbing part of this comparison is that, although in Europe, the use of PBDEs and their concentrations in the environment tend to decline, production and pollution in this country continue to rise steadily.
The EU is considering banning almost all PBDEs (SN: 9/29/01, p. 207: ).
This new VIMS study is far from the first to show that PBDEs can pollute fish.
Earlier this year, another study reported that Lake Michigan salmon had an average of about 2,440 mg/kg of BDE flame retardant
47 shares usually account for about 65%.
Similarly, there is an upward trend in concentration with the size and age of the fish.
Jon B notes that PBDEs seem to be as common as PCBs in this huge lake. Manchester-
Neesvig of the University of Wisconsin and his colleagues.
In North America and Europe, flame retardant substances appear even in breast milk and people\'s fat.
Not surprisingly, the concentration in people\'s bodies is often associated with the consumption of their fish, according to a study reported last year by Andreas sjodin of the University of Stockholm in Sweden and his colleagues.
So is it important that the traces of PBDEs accumulate in our bodies? Unfortunately, the toxicology of these compounds did not keep up with the steps to determine their prevalence in the environment.
A small number of preliminary studies on the presence of toxicity suggest that these contaminants not only mimic estrogen, but also change the body concentration of thyroid hormone.
Reproductive hormone and thyroid hormone play an important role in human development and brain function.
Per Eriksson and his colleagues at Uppsala University in Sweden pointed out that, like PCBs, PBDEs seem to have the ability-at least in laboratory animals-to harm learning and memory.
Reported a few months ago that his team\'s experiments also found exposure to BDE-
47 and another PBDE shortly after birth.
Good news, Per Ola Darnerud of the National Food Administration in Uppsala, Sweden, and his colleagues noted that the concentrations of flame retardant substances commonly found today are far lower than those that cause harm to animals.
Nevertheless, the rapid growth of breasts
His team reported in March 2001 that the concentration of milk had been alarming since the 1970 s.
The new study provides some clues to reduce exposure.
Because fish are often the main source of these contaminants in the human diet, diners may want to avoid big fish from freshwater lakes and streams.
Worried anglers may also want to shift their consumption patterns from predators such as salmon, salmon and carp to smaller prey such as sun fish.
Finally, since PBDEs are easy to accumulate in fat, the chef should consider baking the fish in a way that excess fat will lose.
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