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水蒸气蒸馏-纳氏试剂分光光度法测定钛合金中氮含量
  

摘 要 研究了通过硫酸溶液消解钛合金样品后,加碱液碱化溶液,再利用水蒸气蒸馏收集氨氮。已知纳氏试剂在碱性条件下可显色,于紫外-可见分光光度计420 nm波长处即可测定氮含量。标准样品测试结果值与证书值吻合,加标测试的回收率在 97.1 % ~ 101.9 %。精密度数据S = 0.016 mg/LRSD = 0.82%,准确度及精密度符合均可测试要求。

AbstractTitanium alloy sample is digested by sulfuric acid solution, adding alkali solution to make it alkalinized, and then collect ammonia nitrogen by steam distillation . The color was developed with Nessler reagent under alkaline conditions, and the nitrogen content was measured at a wavelength of 420 nm in an ultraviolet-visible spectrophotometer. The test result of standard sample agrees well with the certificate value, and the recovery rate of the standard addition test is 97.1% ~ 101.9%. Precision data S = 0.016 mg / L, RSD = 0.82%, accuracy and precision meet the analysis and testing requirements.



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