The majority of samples taken had none of these contaminants whatsoever, and none of the products sampled from major retail chains posed any safety concerns.
Of the 100 samples, 22 gave cause for concern.
The survey, conducted last year, found 3-MCPD, common in many foods, at levels well over the EC legal limit that comes into effect on 1 April 2002.
Of the samples found with 3-MCPD, about two-thirds also contained a cancer-causing chemical 1,3-DCP, which experts advise should not be present at any levels in food.
The affected products are imported from Thailand, China, Hong Kong, and Taiwan, and mostly sold in shops specializing in oriental foods. It is also alleged that some of the products are counterfeit.
|15% of soy sauce products contained 1,3-DCP, a cancer-causing agent.
|Food Standards Agency|
Although a quarter of samples taken posed concern, the actual proportion of the UK market taken by these products is thought to be very small.
The Agency is taking action to ensure that the products identified are removed from sale and that consumers do not use them.
The chemicals could cause harm to people who use these products with most of their meals on a daily basis, over a long period of time. Occasional consumers are unlikely to be harmed.
All of the details of the products are available from the FSA website. Agency Deputy Chair, Suzi Leather said, "We want to ensure that consumers of these products are informed of the risks and that effective action is taken to protect them.
"All of the affected products should be removed from the shelves, and consumers should throw away any that they may have.
"Soy sauce can be produced without these chemicals and we expect swift action from the industry to ensure that the planned EU legal limits are met."