Denisov S. N. RussiaSaratovCadet boarding school № 2, Russian Federation, Saratov region, Saratov, Chekhov street, 4-AПреподавателькандидат химических наукkatrin783@mail.ru Author's articles To the Question the Choice of a Derivatizing Agent for the Transfer of Methylphosphonic Acid and its O-alkils Ethers to Chromatographic Derivatives