论文部分内容阅读
锌合金是国防、精仪、机械工业的重要材料,要求严,分析较复杂。本文试液以过重EDTA(二钠盐),以硝酸铅标准溶液滴定过剩的EDTA(二钠盐)。铜以铜试剂比色方法进行测定。铝的测定(EDTA滴定法) 一、试剂 1.盐酸:1:1 2.H_2O_2:浓 3.EDTA:0.05M 4.六次甲基四胺:30％ 5.氟化按:固体 6.二甲酚橙指示剂:0.2％ 7.硝酸铅标准溶液:0.02M 二、分析方法: 称取试样1克,于400ML烧杯中,加1:1盐酸30ML,待作用停止后,滴加H_2O_21ML,煮沸1～2分钟驱除过量H_2O_2,冷却,移入250ML量瓶中,以水稀至刻度摇匀。吸
Zinc alloy is an important material of national defense, precision instrument and machinery industry. The requirements are strict and the analysis is complicated. This test solution with excess EDTA (disodium salt), with lead nitrate standard titration excess EDTA (disodium salt). Copper is determined by the copper reagent colorimetric method. Determination of aluminum (EDTA titration) First, the reagent 1. Hydrochloric acid: 1: 1 2. H_2O_2: concentrated 3. EDTA: 0.05M 4. Hexamethylenetetramine: 30% 5. Fluoride by: solid 6. bis Cresol orange indicator: 0.2% 7. Lead nitrate standard solution: 0.02M Second, the analytical method: Weigh the sample 1 g in 400ML beaker, add 1: 1 hydrochloric acid 30ML, to be stopped after the role of H_2O_21ML, Boil 1 to 2 minutes to drive off excess H_2O_2, cool, move to 250 ML flask, and dilute to the mark with water. Suck