Why Stainless Steel Insulated Cups Are Not Suitable for Tea
Stainless steel cups contain chromium, which is a heavy metal. When a stainless steel cup is corroded and the protective film is damaged, chromium will be released. Prolonged use can cause harm to the human body. According to experts, chromium is a blue-white multivalent metal element, commonly found in trivalent chromium, hexavalent chromium, and divalent chromium. It is hard and brittle, and resistant to corrosion, hence it is often used in stainless steel products.
If the human body ingests a large amount of trivalent chromium for a long time, it can affect the body's antioxidant system, making it prone to chronic oxidative diseases such as diabetes and hypertension. In addition, due to the damage to the antioxidant system, abnormal growth diseases such as tumors are more likely to occur. Compared with trivalent chromium, hexavalent chromium is more toxic, about 100 times stronger.
In clinical practice, hexavalent chromium and its compounds usually harm the human body in three aspects. First, it damages the skin, leading to dermatitis, pharyngitis, etc. Second, it damages the respiratory system, causing pneumonia, tracheitis, and other diseases. Third, it damages the digestive system. Ingesting or long-term contact with chromic acid salts can easily cause gastritis, gastric ulcers, and intestinal ulcers. Excessive intake of hexavalent chromium can also lead to renal failure and even cancer.
Can a thermos cup be used for tea? Taboos for using thermos cups
These liquids should not be put in a thermos cup
1. Milk
Milk is nutritious and many people like to carry it with them. However, because milk is rich in nutrients, vitamins, and other substances are easily destroyed at high temperatures. The microorganisms in milk also tend to multiply rapidly at suitable temperatures, leading to spoilage and causing diarrhea and abdominal pain.
2. High-acidity fruit juice
Fruit juice should not be kept at high temperatures to avoid vitamin destruction. In addition, high-acidity fruit juices can react with the inner wall of the thermos cup, affecting human health.
3. Chinese herbal medicine
The acidic substances in Chinese herbal medicine also tend to react with the chemicals in the inner wall of the thermos cup, producing harmful substances that can damage the body. It is recommended to use ceramic or enamel containers for Chinese herbal medicine.
