摘要：

采用电感耦合等离子发射光谱法（ICP-AES）测定火电厂机组水汽系统垢和腐蚀产物中K、Ca、Na、Mg、Fe、Al、Cu等金属元素含量，需对样品进行熔融、浸取等处理以制得符合仪器进样条件的待测液。对影响偏硼酸锂熔融法制备垢成分待测液的操作条件，如熔融温度、熔融时间、熔剂投加量及样品前处理方法等进行了实验优化。制得的测试液透明无沉淀，提高了样品熔融浸取效果。在优化后的条件下，对多个电厂垢样进行熔融浸取及待测液成分检测，其元素回收率为92.75%~95.77%，RSD均低于2%，验证了本方法的准确性和可靠性。

关键词: 偏硼酸锂, 熔融法, 电感耦合等离子发射光谱法, 垢和腐蚀产物, 成分测定

Abstract:

The metal elements contents of K, Ca, Na, Mg, Fe, Al, Cu et al. in scale and corrosion products of steam system of firepower units were determined by inductively coupled plasma atomic emission spectrometry(ICP-AES). The samples need to be melted and leached to prepare the liquid to be measured which meets the sampling conditions of the instrument. The operating conditions, such as melting temperature, melting time, flux dosage and sample pretreatment method, which affect the preparation of scale components prepared by lithium metaborate melt were optimized. The prepared test solution is transparent without precipitation, which improves the leaching effect of sample melt. Under the optimized conditions, melt leaching of scales from several power plants and composition detection of liquid to be measured showed that the recovery rate of elements was 92.75-95.77% and RSD was less than 2%, which verified the accuracy and reliability of the method.

Key words: lithium metaborate, melting method, inductively coupled plasma emission spectroscopy, scale and corrosion products, composition determination

中图分类号: 

• X703