How to distinguish whether the ceramic tableware exceeds the standard of heavy metals?

How to distinguish whether the ceramic tableware exceeds the standard of heavy metals? 1. Choose formal merchants and markets when purchasing, and it is best not to buy in irregular places such as roadsides and small vendors. Recognize the manufacturer of ceramic tableware, because the country has regulations. Before leaving the factory, the ceramic tableware must be soaked in 4% acetic acid solution. The amount of lead in the tableware should be less than 7 mg/L, and the amount of cadmium should be dissolved. Less than 0.5 mg/L, so that it is suitable for use. Formal manufacturers generally meet this requirement, and informal manufacturers cannot guarantee to meet this standard. 2. Pay attention to the color of the ceramic tableware, the glaze surface is uniform, the appearance pattern is meticulous, not rough, it is best to touch the tableware surface by hand to see if it is smooth, especially the inner wall part, good quality tableware has no uneven small particles. 3. Smell the ceramic white porcelin dinnerware. If there is a peculiar smell, the tableware has a high content of harmful elements and should not be purchased. 4. Do not buy ceramic tableware with bright colors and patterns because of the pursuit of beauty and novelty. In order to look more beautiful, this tableware usually adds some heavy metal additives to the glaze. Heavy metals are harmful to the human body. Therefore, the brighter the ceramic tableware, the more heavy metal content, and the easier it is to exceed the standard. 6. It is best to choose ceramic tableware with in-glaze and under-glaze crafts. These two crafts have stricter requirements in the manufacturing process, and the content of heavy metals in the pigments is less. 6. Before using the ceramic tableware, boil it in boiling water for about 5 minutes, or soak it in vinegar for 2-3 minutes, so that the toxic elements in the tableware can be dissolved out.

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