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Safe handling & Storage and disposal of Oxalic Acid

Safe handling & Storage and disposal of Oxalic Acid

Oxalic acid is an organic compound with the formula c ^ 2 ^ h 2 ö 4. It is a white crystalline solid that forms a colorless solution in water. Its condensation formula is HOOCCOOH, reflecting that it is the simplest classification of dicarboxylic acids.

It occurs naturally in many foods, but excessive intake of oxalic acid or prolonged contact with the skin can be dangerous.

This passage is going to talk about the followings of oxalic acid:

(1) Definition and chemical traits of oxalic acid

(2) Is oxalic acid harmful to humans?

(3) Precautions when using oxalic acid


(1) Definition and chemical traits of oxalic acid

Oxalic acid is an organic substance with a chemical formula of HOOCCOOH. It is a metabolite of living organisms. It is a weak dibasic acid. It is widely distributed in plants, animals and fungi, and performs different functions in different organisms.

Studies have found that more than 100 kinds of plants are rich in oxalic acid, especially spinach, amaranth, sugar beet, purslane, taro, sweet potato and rhubarb. Because oxalic acid can reduce the bioavailability of mineral elements, it is easily combined with calcium in the human body. The formation of calcium oxalate by ions leads to kidney stones, so oxalic acid is often regarded as an antagonist of the absorption and utilization of mineral elements. The acid anhydride is carbon trioxide.

Oxalic acid is widely found in plant-derived foods. Oxalic acid is a colorless columnar crystal, easily soluble in water but not soluble in organic solvents such as ether.

Oxalate has a strong coordination effect and is another type of metal chelating agent in plant-derived foods. When oxalic acid is combined with some alkaline earth metal elements, its solubility is greatly reduced. For example, calcium oxalate is almost insoluble in water. Therefore, the presence of oxalic acid has a great influence on the bioavailability of essential minerals; when oxalic acid is combined with some transition metal elements, due to the coordination effect of oxalic acid, a soluble complex is formed, and its solubility is greatly increased.

Oxalic acid begins to sublime at 100°C, rapidly sublimates at 125°C, and sublimates in large quantities at 157°C and begins to decompose. It can react with bases, and can undergo esterification, acid halide, and amidation reactions. Reduction reaction can also occur, and decarboxylation reaction occurs when heated. Anhydrous oxalic acid is hygroscopic. Oxalic acid can form water-soluble complexes with many metals.


(2) Is oxalic acid harmful to humans?

Around us, oxalic acid is generally used as a rust remover or can remove ink stains on white clothes, but it is actually a dangerous chemical substance that can kill people.

But do you know that oxalic acid is also contained in the chocolate that you usually eat? Don't panic, this dangerous situation rarely occurs. We consume oxalic acid through many different channels every day. Oxalic acid is present in a small amount in many foods, and the content is high in a few foods. Cocoa is one of the foods with the highest content. Each 100 grams of cocoa contains 500 mg of oxalic acid. The content of oxalic acid in green vegetables is generally very high. Each 100 grams of spinach contains 600 milligrams, rhubarb contains 500 milligrams, and there are also beets, peanuts, and teas. More oxalic acid. An average person consumes about 150 mg of oxalic acid a day, and the LD50 of pure oxalic acid, measured by the effect on rats, is about 375 mg per kilogram of body weight, which translates to about 65 kilograms of human being. A 25-gram serving. In addition, the oral minimum lethal dose (LDLo) is approximately 600 mg/kg.


(3) Precautions when using oxalic acid

Oxalic acid is not easy to be oxidized and decomposed in the human body. The product formed after metabolism is an acidic substance, which can cause the pH of the human body to be out of balance, and overeating can cause poisoning.

In addition, if oxalic acid encounters calcium and zinc in the human body, calcium oxalate and zinc oxalate are formed, which are difficult to absorb and excrete from the body, which affects the absorption of calcium and zinc.

Children need a lot of calcium and zinc for growth and development. If the body lacks calcium and zinc, it will not only lead to poor development of bones and teeth, but also affect mental development.

Excessive intake of oxalic acid can also cause stones.




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