脱硝粉煤灰铵含量测定方法的试验研究

通过试验,对粉煤灰中残留铵的萃取方法进行优化,确定蒸馏滴定法中粉煤灰铵溶液的制备参数;同时采用蒸馏滴定法和离子色谱法,对粉煤灰中的铵离子含量进行定量检测,验证粉煤灰中残留铵含量测定方法的重复性和再现性;并且建立了粉煤灰中残留铵含量的测定方法。研究结果表明,蒸馏滴定法中,溶液制备参数和滴定方法,对粉煤灰铵含量的检测结果产生显著影响,可通过规定溶液制备参数和熟练滴定方法提高试验精度。蒸馏滴定法试验结果的重复性和再现性符合精密度要求,可作为粉煤灰中残留铵含量测定的基准方法。离子色谱法测得的结果略低于蒸馏滴定法,可作为代用法。

Experimental Study on Determination Method of Ammonium Content in Denitrated Fly Ash

Through the experiment, the extraction method of residual ammonium in fly ash was optimized, and the preparation parameters of the fly ash ammonium solution in the distillation titration method were determined. At the same time, the ammonium ion content in the fly ash was determined by distillation titration and ion chromatography, the repeatability and reproducibility of the quantitative testing method for determining residual ammonium in fly ash was verified;and a method for determining residual ammonium content in fly ash was established. The results show that in the distillation titration method, the solution preparation parameters and the titration method have a significant effect on the detection results of the ammonium ash content of the fly ash, and the test accuracy can be improved by specifying the preparation parameters of the solution and the skilled titration method. The repeatability and reproducibility of the results of the distillation titration test meet the precision requirements and it can be used as a standard method for determining the residual ammonium content in fly ash. The results obtained by ion chromatography are slightly lower than the distillation titration method and can be used as a substitute.