ICP-AES在分析飞灰中重金属化学形态上的应用

采用ICP-AES法对垃圾焚烧飞灰中七种重金属不同化学形态的含量进行了测定。该方法快速、准确，具有较好的精密度和准确度，除个别重金属浓度接近检出限时RSD相对较大外，其余测定结果RSD＜3%，加标回收率为85.7%～100.63%。分析结果表明：飞灰中重金属Zn，Pb含量较高;Cd，Cu，Mn，Pb和Zn以碳酸盐结合态为主要形态，易进入环境;而Cr和Ni的Fe-Mn氧化物结合态最多，相对比较稳定。

Application of ICP-AES to the Chemical Speciation of Heavy Metals in Flyash

Chemical speciation of seven heavy metals of flyashes in incinerator was quantitatively tested using 1CP-AES. Results showed that ICP-AES procedure could carry out quick, exact and high precision experiments. RSD ratio for most detected metals was lower than 3% while few metals present a comparatively high RSD when whose content was near the detection limits. The recovery ratio was 85.7%-100.63% flyashes were found to have high content of Zn, Pb. Cd, Cu, Mn, Pb and Zn existed mostly as carbonates and were leachable, while Cr and Ni were combined to metal oxides substrates and present immobilization characteristics.