The chemical is kept pressurized as part of the cooling system in meat processing plants.
In Cornwall, 555 staff work at VION's red meat processing sites in Bodmin, Victoria and Truro.
The French government has accused meat processing company Spanghero of knowingly selling horsemeat labelled as beef.
French meat processing company Spanghero knowingly sold horsemeat labelled as beef, the French government has said.
The meat processing plant is due to close by February with the loss of 1, 700 jobs.
In England, it has poultry plants in Essex and Suffolk and red meat processing plants in Cornwall.
Three parties are interested in bidding for a closure-threatened meat processing plant, the finance secretary has said.
Some have only shown traces, which may be the result of meat processing plants not properly cleaning equipment.
The Irish Farmers' Association has appealed for increased inspections at meat processing plants.
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The latest scandal surrounding horsemeat in processed food could be "disastrous" for the meat processing industry, retail analysts are warning.
The company has already announced the closure of a Scottish meat processing plant with the loss of 1, 700 jobs.
Mr Walker also claimed that at least one Irish meat processing company had been introducing horsemeat into the food chain.
French meat processing firm Spanghero will be allowed to produce certain types of meat after France partially lifted its licence suspension.
There are people who have been pushed out of jobs and factories and meat processing plants, and all kinds of settings.
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More than 100 jobs will be created in Hull after a meat processing company announced plans to open a new packing plant.
Northern Ireland Deputy First Minister Martin McGuinness has called for the police to investigate the latest revelations about the meat processing industry.
Dutch officials have raided a meat processing plant suspected of mislabelling beef.
Nearly 3, 000 jobs were safeguarded at three poultry and meat processing plants in Wales after a buyout by a meat suppliers last week.
In February, Dutch officials raided a meat processing plant suspected of mislabelling beef and ordered the withdrawal of suspicious products from supermarket shelves.
BBC: Horsemeat scandal: Dutch uncover large-scale meat fraud
Food standards inspections, undertaken by councils and co-ordinated by the FSA, are being carried out in all approved meat processing facilities in Scotland.
Two suspects were detained at a meat processing plant near Aberystwyth in Wales, and a third was arrested at an abattoir in West Yorkshire.
Yet this technology, which would prevent millions of cases of food poisoning and scores of resulting deaths, has not been required at meat processing plants.
Other researchers offered results on useful new ingredients for meat processing.
Guidelines issued Wednesday by the national health agency identify butchers, breeders and sellers of poultry, and those in the meat processing industry as at higher risk.
When it swills out of abattoirs and rendering-plants it carries some animal excrement, along with all the other debris for which even industrial meat processing finds no use.
Three farms near the border have been placed under a restriction order, along with a farm and a meat processing plant which may have had deliveries from the affected Northern Ireland site.
The investigations come as Europe's food industry has been engulfed by a meat processing and labelling scandal after multiple processed meat products labelled as beef were revealed to contain quantities of horsemeat.
The St Merryn plant in Merthyr Tydfil is the largest single meat processing and packing plant in the UK, according to Vion which described its decision to sell as not easy but essential.
So we need to make sure that we have the infrastructure in place, from the meat processing to the transportation and storage to make that a reality, because that really is and could be a reality for us.
WHITEHOUSE: President Obama Closes Forum on Jobs and Economic Growth
Fallin said her administration will work with the Oklahoma Department of Agriculture to ensure that any horse meat processing plant in the state is run appropriately, follows state and local laws, and does not pose a hazard to the community.
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