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作者曾经采用重氮化返滴定法测定 PANS 的含量,得到简称满意的结果.但该法存在有下列几个缺点:(1)操作条件要求比较严格,如用碱水解后进行中和时,必须严格注意控制温度、酸浓度及充分搅拌等,否则生成的沉淀颗粒大小就不同,而对结果有一定影响.(2)采用外指示剂,应用不便,亦易产生误差.(3)所需操作时间较长.因此该法有进
The authors have used diazotized back titration method to determine the content of PANS and obtained the abbreviation of satisfactory results. However, this method has the following disadvantages: (1) The operating conditions are more stringent, such as the neutralization after alkali hydrolysis, must be Strict attention should be paid to control of temperature, acid concentration, and sufficient agitation, otherwise the resulting precipitated particles will have different sizes, which will have a certain impact on the results. (2) The use of external indicators may cause inaccuracies in applications. (3) Required operations The time is longer. Therefore the law has progressed