At last, it titrates with ferrous ammonium sulfate, using the sodium diphenylamine sulfonate as a catalyst.
以二苯胺磺酸钠为指示剂，用硫酸亚铁铵标准溶液滴定。
Biodegradability of the nitrocellulose with diphenylamine was investigated in this paper.
研究了含二苯胺硝化棉的生物降解特性。
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