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本文系作者1968年报导氯仿萃取砷的碘络合物及其应用的进一步研究与改进。被研究的苯、甲苯、二甲苯、氯仿和四氯化碳五种非极性有机溶剂,在小于6N硫酸中不萃取砷(Ⅲ)的碘络合物,在7—9N时萃取率直线上升,至9.5N时最后两种已能定量萃取砷(Ⅲ),且以四氯化碳萃取速度最快,正、反萃取一次仅需9秒钟。被国外普遍选用的苯的效果不及四氯化碳,其余两种更差。作者对碘(I~-与I_2)在萃取过程中的行为作详细研究后指出,由于标准氧化势
This article is the author of the 1968 report of chloroform extraction of arsenic iodine complex and its application of further research and improvement. The studied five kinds of nonpolar organic solvents, benzene, toluene, xylene, chloroform and carbon tetrachloride, did not extract arsenic (Ⅲ) iodine complex in less than 6N sulfuric acid. The extraction rate increased linearly at 7-9N , To the last two kinds of 9.5N has been able to quantitative extraction of arsenic (Ⅲ), and carbon tetrachloride extraction fastest, positive and anti-extraction time only 9 seconds. Benzene commonly used abroad is less effective than carbon tetrachloride, the other two are even worse. After a detailed study of the behavior of iodine (I ~ - and I_2) in the extraction process, the author pointed out that due to the standard oxidation potential