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作者用N-肉桂酰-N-2,3-二甲苯羟胺(CXA)作螯合剂萃取钒,为防止钒与碳管生成难离解的碳化钒,所用碳管涂有一层热解石墨。样品(含钒10～80 ng/ml)经硝酸、高氯酸消化后转入分液漏斗,逐滴加入高锰酸钾(0.02N),直到粉红色能保持5分钟时为止。加入CXA(1 ml)和浓盐酸,使溶液酸度为6 N。振摇三分钟,取下层四氯化碳液20μl进行测定。操作条件:钒共振线318.4 nm、灯电流10
The authors used N-cinnamoyl-N-2,3-dimethylhydroxylamine (CXA) as a chelating agent for vanadium extraction, in order to prevent the formation of vanadium and carbon nanotubes difficult to dissociate vanadium carbide, carbon nanotubes coated with a layer of pyrolytic graphite. Samples (vanadium-containing 10-80 ng / ml) were digested with nitric acid and perchloric acid and transferred to a separatory funnel. Potassium permanganate (0.02 N) was added dropwise until the pink color remained for 5 minutes. CXA (1 ml) and concentrated hydrochloric acid were added to make the solution acidity 6N. Shake for three minutes, take the lower layer of carbon tetrachloride 20μl determination. Operating conditions: Vanadium resonance line 318.4 nm, lamp current 10