Citation: Xue Mei, Cao Duanlin, Zhou Lin, Wu Fei, Hao Caili, Gao Zhijin, Liu Yang, Li Yongxiang. Study on Acid Dissociation Constant Determination Methods of Insensitive Explosives DNP and NTO[J]. Chemistry, ;2016, 79(4): 338-343. shu

Study on Acid Dissociation Constant Determination Methods of Insensitive Explosives DNP and NTO

Xue Mei ¹ ,
Cao Duanlin ¹ ,
Zhou Lin ² ,
Wu Fei ¹ ,
Hao Caili ¹ ,
Gao Zhijin ¹ ,
Liu Yang ¹ ,
Li Yongxiang ^1,,

1.
1. College of Chemical Engineering and Environment, North University of China, Taiyuan 030051;
2.
2. School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081

Corresponding author: Li Yongxiang,
Received Date: 6 July 2015
Available Online: 3 November 2015

The dissociation constants (pK_a) of two insensitive explosives 3,4-dinitropyrazole (DNP) and 3-nitro-1,2,4-triazol-5-one (NTO) were determined by five methods including titration, half neutralization, pH, electrical conductivity and UV-spectrophotometry. The results obtained from various methods were compared and discussed. The results showed that the methods of titration, half neutralization and UV-spectrophotometry are more suitable to determine the pK_a of DNP, the relative error RE<5%; and methods of titration and pH are more suitable to determine the pK_a of NTO, the relative error RE<4%. pK_a of DNP is larger than that of NTO, which means acidity of DNP is weaker, so DNP have small causticity to the equipments and could preferably be used as melt-cast explosive carrier. Based on the advantages and disadvantages of the five methods, the appropriate methods for determining pK_a of different chemical substances were summarized.
- 3,4-Dinitropyrazole(DNP),
- 3-Nitro-1,2,4-triazol-5-one (NTO),
- Dissociation constants
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