论文部分内容阅读
问:用电解法测定纯铜中铜溶解试样时应注意些什么?——上海读者金林 溶解纯铜试样时应注意防止铜溶液的飞溅损失。在铜样与硫硝混合酸反应时,肉眼也能看到有溶液以细雾状随酸的蒸气在溶液的上面飞腾。为防止其逸出烧杯而造成损失,常采取以下措施:(1)加热温度不宜太高,在刚加入混合酸后的几分钟内因反应已较剧烈,一般可不另加热,待作用缓慢时再加热,加热温度以保持80～90℃为宜。试样全部溶解后应继续加热使氮的氧化物赶尽;(2)为了保证试样溶液在溶样过程中不损失,也有规定用特制的电解烧杯。如美国ASTM方法中采用200ml或300ml
Q: What should be noticed when using electrolytic method to determine copper dissolved sample in pure copper? - Shanghai reader Jinlin dissolved pure copper sample should pay attention to prevent splashing loss of copper solution. In the copper-sulfur and nitric acid mixed acid reaction, the naked eye can see a solution to fine mist with the acid vapor in the solution of the above soaring. In order to prevent it from escaping from the beaker and causing losses, often take the following measures: (1) heating temperature should not be too high, just after adding mixed acid within a few minutes due to the reaction has been more intense, generally no additional heating until slow acting again heating , Heating temperature to maintain 80 ~ 90 ℃ appropriate. After the sample is completely dissolved, heating should be continued to drive the nitrogen oxides out. (2) In order to ensure that the sample solution is not lost during the sample dissolving process, a special electrolytic beaker is also provided. Such as the United States ASTM method used 200ml or 300ml