论文部分内容阅读
在三氧化二鉻定量分析中,不溶性三氧化二鉻的最初处理,都采用碳酸鈉及过氧化鈉等碱性熔剂进行熔融,然后再进行溶解。有时第一次不能完全溶解,則需要經过过滤和再熔融等煩杂手續,因此在分析工作中造成一定的困难,不但操作手續多,时間花得长,而且增加了誤差。因此在試样較多的情况下,該种分析方法有改进的必要。經过多次的試驗証明:在重鉻酸鉀存在下,濃硫酸能够将三氧化二鉻完全溶解,得到的低价鉻,在适当濃度的
In the quantitative analysis of chromium oxide, the initial treatment of insoluble chromium oxide is carried out by melting with an alkaline solvent such as sodium carbonate and sodium peroxide and then dissolving. Sometimes the first time can not be completely dissolved, you need to go through the filtering and re-melting and other complicated procedures, so some difficulties in the analysis, not only the number of procedures, the time spent a long time, but also increased the error. Therefore, in the case of more samples, this kind of analysis methods need to be improved. After several tests proved that: in the presence of potassium dichromate, concentrated sulfuric acid can be completely dissolved chromium oxide, the resulting low-cost chromium, at the appropriate concentration