Oxalic acid, oxalic acid, is one of the simplest organic dibasic acids. The structure is simple HOOCCOOH. It is generally colorless and transparent crystal, harmful to the human body, will make the body's pH imbalance, affecting the development of children, oxalic acid plays an important role in the industry, oxalic acid can rust. Oxalic acid is found throughout nature and is often found in the form of oxalates in the cell membranes of plants such as barberry, shamrock, sorrel and sorrel. Almost all plants contain oxalate.
Oxalic acid is a metabolite of organisms, widely distributed in plants, animals and fungi, and plays different functions in different living organisms. The study found that more than 100 kinds of plants are rich in oxalic acid, especially in spinach, leeks, beets, purslane, taro, sweet potato and rhubarb. Because oxalic acid can reduce the bioavailability of mineral elements, it is easy to be calcium in human body. Ionic formation of calcium oxalate leads to kidney stones, so oxalic acid is often considered to be an antagonist of mineral element absorption and utilization.
Colorless monoclinic or prismatic crystal or white powder, oxidized oxalic acid odorless, synthetic oxalic acid. Sublimation at 150~160°C. Weathering in high heat dry air. 1 g is dissolved in 7 ml of water, 2 ml of boiling water, 2.5 ml of ethanol, 1.8 ml of boiling ethanol, 100 ml of diethyl ether, 5.5 ml of glycerin, and is insoluble in benzene, chloroform and petroleum ether. The pH of the 0.1 mol/L solution was 1.3. Relative density (d18.54) 1.653. Melting point 101~102 ° C (187 ° C, anhydrous). Low toxicity, half lethal dose (rabbit, percutaneous) 2000mg/kg.
