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华师大合成的具有新颖结构的显色剂—兴多偶氮氯膦Ⅰ除保留偶氮氯膦Ⅰ的优点外,灵敏度增高,比耳定律范围扩大,是一种优良的镁的显色剂,能满足目前生产上的要求。分析方法一试剂硼砂—氢氧化钠缓冲液:pH=11.0,50克硼砂加9.5克氢氧化钠,用温水溶解,稀释至1升。邻菲啰啉:0.4%,2克邻菲啰啉溶于20毫升乙醇中,用水稀释至500毫升。 EGTA—Pb混合液:0.005M,取0.01M EGTA.溶液100毫升,加入0.01M硝酸铅110毫升,混匀,用硼砂缓冲液调节pH至6左右。 EGTA溶液:0.01M,称取EGTA 3.8035克,加水200毫升,加热并滴加少量氢氧化钠溶浓助溶,
China Normal University synthesis of the novel structure of the developer - Hing DOP chlorophosphonazo I save the advantages of chlorophosphonazo I, the sensitivity increased, expanding the scope of Beer’s law, is an excellent reagent for magnesium color , To meet the current production requirements. Analytical methods A reagent borax - sodium hydroxide buffer: pH = 11.0, 50 g borax plus 9.5 g sodium hydroxide, dissolved in warm water, diluted to 1 liter. Phenanthroline: 0.4%, 2 g of phenanthroline dissolved in 20 ml of ethanol, diluted with water to 500 ml. EGTA-Pb mixture: 0.005M, take 0.01M EGTA 100ml, add 110ml of 0.01M lead nitrate, mix and adjust pH to about 6 with borax buffer. EGTA solution: 0.01M, weighed EGTA 3.8035 grams, add 200 ml of water, heated and dripped with a small amount of sodium hydroxide dissolved in concentrated solution,