秸秆灰中水溶钾含量三种检测方法的比较  

A comparison on three methods for measuring of water-soluble potassium content in straw ash

作　　者：张毅[1,2] 于如军 张政清[1] 高振强[1,3] 杨彬彬[1] 何芳[1] Zhang Yi;Yu Rujun;Zhang Zhengqing;Gao Zhenqiang;Yang Binbin;He Fang(School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China;School of Energy and Power Engineering, Shandong University, Ji＇nan 250061, China;School of Energy and Power Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China)

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255049 [2]山东大学能源与动力工程学院,山东济南250061 [3]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《可再生能源》2017年第11期1588-1594,共7页Renewable Energy Resources

基　　金：国家自然科学基金项目(51676115)

摘　　要：水溶钾含量是衡量秸秆灰肥性的重要指标之一。文章以火焰光度计法为基准,研究了K+选择性电极法(电极法)和X射线荧光光谱法(XRF法)与基准方法对水溶钾含量检测结果的差异。研究结果表明,对于550℃下制取的玉米秸灰和麦秸灰,电极法的相对误差为-6%~6%,XRF法检测出的水溶钾含量偏高,相对误差小于18%。对XRF法检测结果的单因素敏感性分析表明,原灰中钾含量的检测误差是导致检测结果不准确的主要原因。Water-soluble potassium content is one of the important indicators to evaluate the fertilizer property of straw ash. In this study, base on flame photometer（FP） method, the difference between the measurement results of X-ray fluorescence spectrometry（XRF） and potassium-ion selective electrode（PISE） and that of FP were studied. The results shows that for corn straw and wheat straw ashes prepared at 550 ℃, the relative error of PISE are less than-6%-6%. The measured potassium content of XRF is higher than that of FP and the relative error is less than 18%. Sensitivity analysis shows that the inaccuracy of potassium content in original ash is the dominant error source in XRF.

关 键 词：秸秆灰 水溶钾 火焰光度计法 K+选择性电极法 X射线荧光光谱法 

分 类 号：TK6[动力工程及工程热物理—生物能]