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| Term | Definition | Article | Siehe auch |
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| by-product: Wikipedia: by-product |
Chemical synthesis produces unwanted by-products in addition to the desired final product, often in the range of some percent of the final product. We limit this term according to the EC guideline for chemical preparations to substances that are present in the product above 1 % before purification. By using optimal reaction conditions by-products can often be avoided. | dangerous trace impurity |