不同粒径医疗废物焚烧飞灰中重金属含量的试验研究

Contents of Heavy Metals in the Incineration Fly Ash of Hospital Waste with Various Particle Sizes

采用微波消解-原子吸收分光光度法对黄山市医疗废物焚烧飞灰中的重金属含量进行了试验研究.首先对经过预处理后的飞灰样品进行微波消解,寻找最佳消解体系；然后对不同粒径消解后的飞灰样品采用原子吸收和原子荧光法测定重金属含量.试验结果证明：微波消解的最佳酸体系为HNO3∶HF∶ HClO4=10∶1∶5；在飞灰样品6个粒径范围内,Cu的含量范围为877.65～1 169.35 mg/kg,Pb的含量范围为2 292.25～3 935.45mg/kg,Zn的含量范围为2 085～14 000 mg/kg,Cd的含量范围为143.2～197.7 mg/kg,As的含量范围为5.5～76mg/kg,其中在粒径212～900 μm范围内Zn的含量最高,在粒径74～100μm范围内As的含量最高.

This paper adopts microwave digestion method to study the contents of heavy metals in the incin eration fly ash of hospital waste with various particle sizes. The pre treatment fly ash is digested to find the best digestion system and then the contents of heavy metals in the incineration fly ash are measured by a- absorption and atomic fluorescence. The results show that the best acid for microwave digestion is HNO3 ： HF are 877.65- 5.5-76 mg/ μm and As h HC104 = 10 ： 1 ： 5 in the range of six particle sizes,the contents of Cu,Pb,Zn,Cd and As 1 169.35 mg/kg,2 292.25-3935.45 mg/kg,2 085-14 000 mg/kg,143.2-197.7 mg/kg and kg,respectively; Zn has the higher content than others within the particle sizes of 212-900μm and As has the higher content than others within the particle sizes of 74~100 μm.