Measuring Melamine in Food
In March 2007, the Food and Drug Administration (FDA) learned that some pet foods were making cats and dogs sick; in fact, many died. An investigation led FDA to discover contaminants that were imported into the United States and used as ingredients in pet food. Ultimately, investigators linked the melamine contamination to other products. The agency continues to test products for the presence of melamine. In these photos, FDA chemist use gas chromatography to measure levels of melamine in food samples.

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