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Application of ultraviolet spectrophotometer in petroleum, feed, etc.
Tags: Feed oil analysis instrument UV-visible spectrophotometer UV-1700SPC Abstract: Many environmentally-friendly (including air, water, soil) detection of human toxic and hazardous substances, using UV-visible spectrophotometer, such as detecting tap water Lignosulfonic acid, lignin, tannin, surfactant, fulvic acid, phenols, anilines, nitrophenolic compounds and other substances that are toxic to humans. Some tap waters contain substances such as ammonia nitrogen, nitrite, total phenol, total aniline, and nitrophenols that are toxic to humans, and are generally detected by an ultraviolet-visible spectrophotometer.
In the process of oil exploitation and processing, oil may cause pollution. In the production of sewage from the petroleum industry, the content of petroleum in the drainage is generally specified as 10 mg / L.至0. 3mg / L。 In the surface water, the maximum allowable oil content of 0. 1 ~ 0. 3mg / L. In general petroleum refineries, the aromatic hydrocarbon composition of petroleum is relatively stable, and the absorption peaks of the standard oils are measured at 221 to 225 nm and 251 to 255 nm. The two characteristic absorption peaks of petroleum (225 nm and 254 nm) are the absorption wavelengths to be used in determining the oil content in refinery wastewater. In addition, the light oil component (initial distillation about 180 ° C) has almost no obvious UV absorption, while the medium oil (180-250 ° C) and heavy oil (250-280 ° C), as well as eucalyptus oil (> 280 ° C) and other components at 225 nm Strong absorption. It represents the main peak of the petroleum component, which is weakly absorbed at 254 nm and sometimes shows the characteristics of a certain heavy oil. These analytical work were performed using an ultraviolet-visible spectrophotometer. Also, in the refining process, oil has an aromatic impurity near 320 nm, which must also be detected by an ultraviolet-visible spectrophotometer. Therefore, the UV-Vis spectrophotometer is a very important quality control instrument in the petroleum industry. Many of the toxic and hazardous substances in the environment for detecting harmful substances in the environment (including air, water, and soil) use ultraviolet-visible spectrophotometers, such as lignin sulfonic acid, lignin, and tannin in tap water. A substance that is toxic to humans such as surfactants, fulvic acid, phenols, anilines, and nitrophenols. Some tap waters contain substances such as ammonia nitrogen, nitrite, total phenol, total aniline, and nitrophenols that are toxic to humans, and are generally detected by an ultraviolet-visible spectrophotometer. In China's water-related national standards, many substances in water are required to be detected by an ultraviolet-visible spectrophotometer. In the feed industry, vitamin A, vitamin C, vitamin E, vitamin K, sorbic acid, benzoic acid, cotton acid, methyl ester, acetate, carotene, niacin, etc. in raw materials, additives, mixed feeds, etc. Trace elements such as total amino acids such as potassium, iron, selenium, iodine, copper, phosphorus, manganese, etc. are often detected by UV-visible spectrophotometer (but usually the atomic absorption spectrophotometer is used to determine trace elements, and colorimetric determination is currently relatively rare. )). Further, the determination of the fly fly phosphorus, the sulfonamide, the griseofulvin, the dimetridazole, and the procaine in the feed additive can be basically carried out by an ultraviolet-visible spectrophotometer. Pesticides and their residues are analyzed for pesticides that enter the soil, some are absorbed by crops (such as BHC, which can be absorbed by carrots, peanuts, etc.), some enter the atmosphere, and some enter the water. Pesticide residues include pesticides, toxic metabolites of pesticides, pesticide degradants and impurities. People often only regard pesticides as pesticide residues, ignoring metabolites, degradants and impurities of pesticides. In fact, the toxicity of metabolites and degradants is the same or more serious than the original drug. For example, the metabolite of DDT is Drip, the metabolite of industrial BHC is BHC, and the metabolite of Pesticide 1605 is 1601. These metabolites are more toxic than the original. The metabolites of the insecticide are 10 times more toxic than the original drug. Many pesticides are very harmful to the human body. For example, BHC and DDT are very damaging to human liver tissue and liver function, which can cause chromosomal mutations in blood cells. Organochlorine pesticides can enter the fetus through the placenta and harm the fetus. Organophosphorus pesticides, carbamate pesticides, etc. are neurotoxic substances, which inhibit the activity of acetylcholinesterase in blood and tissues, causing disorders of nerve function, sweating, confusion, and language disorders. According to the American Cancer Research Center, 90% of human cancers are caused by organic matter, mainly pesticide residues. Therefore, developed countries pay great attention to the detection of pesticides and their residues. For example, Japan has developed nearly 10,000 MRLs for hundreds of pesticides in recent years. Among them, there were 3,728 vegetables, and the maximum residue limit of 116 pesticides was established for rice. Humans continue to ingest a small amount of pesticide residues in a long period of time, the most terrifying is the cause of three, that is, carcinogenic, teratogenic and mutagenic. Tags: feed oil analysis instrument UV-visible spectrophotometer UV-1700SPC plastic keychains wholesale,plastic keychain craft,plastic keychain diy,plastic keychain tags,custom plastic keychains
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