使用半自动定氮仪测定天然橡胶氮含量方法的优化

Optimization on the Determination Method of Nitrogen Content of NR by Semi-automatic Azotometer

对使用半自动定氮仪测定天然橡胶氮含量的方法进行优化,试验方法1为0. 5 g胶料+3. 25 g混合催化剂+70mL氢氧化钠溶液+50mL硼酸溶液吸收;试验方法2为0. 1~0. 2g胶料+0. 65g混合催化剂+20mL氢氧化钠溶液+20mL硼酸溶液吸收。结果表明:试验方法1和2测得的胶料氮含量基本一致,均可行;但与试验方法1相比,试验方法2具有用时短、效率高、成本低和安全可靠的优点。

The determination method of nitrogen content of NR by semi-automatic azotometer was optimized.In the test method 1,0.5 g rubber compound was used with 3.25 g mixed catalyst,70 mL sodium hydroxide solution,and 50 mL boric acid solution for absorption.In the test method 2,only 0.1~0.2 g rubber compound was needed with 0.65 g mixed catalyst,20 mL sodium hydroxide solution,and 20 mL boric acid solution for absorption.The results showed that the nitrogen contents measured by these two methods were consistent,However,compared with test method 1,the testing time of method 2 was shorter,the efficiency was higher,the cost was lower,the testing procedure was more safe,and the test was more reliable.