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微量锆的测定有邻苯二酚紫法、二甲酚橙法等,这些方法对酸度要求严格,选择性较差,偶氮胂Ⅲ法虽灵敏度高,选择性也较好,但用于复杂试样分析仍需进行分离,且反应酸度高,操作不便。 本文用三溴偶氮氯膦(即2—4—(氯—2—膦酸基偶氮—7—(2,4,6—三溴偶氮)—1,8—二羟基—3,6—二磺酸萘)为显色剂,在0.5N盐酸介质中与锆生成蓝绿色络合物,灵敏度较高(ε=3.56×10~4)稳定性,选择性较好,大量合金元素不干扰,可不用分离直接测定钢铁及铜、铝、镁等合金中的锆,与偶氮胂Ⅲ法对照,结果满意。
Trace determination of zirconium pyrocatechol purple method, xylenol orange method, these methods are demanding on the acidity, selectivity is poor, although arsenazo arsenazo method high sensitivity and selectivity is better, but for complex Sample analysis still need to be separated, and the reaction of acidity, easy to operate. Chlorotrifluoroacetic acid (ie, 2-4- (chloro-2-phosphonoazo-7- (2,4,6-tribromoazo) -1,8-dihydroxy-3,6 -disulfonate naphthalene) as color reagent. It has a high sensitivity (ε = 3.56 × 10 ~ 4) stability and good selectivity to zirconium in 0.5N hydrochloric acid medium. A large amount of alloying elements Interference, can be directly measured without separation of steel and copper, aluminum, magnesium and other alloys zirconium, and arsenazo Ⅲ method control, the results are satisfactory.