两种方法测定城市污泥中铊含量研究

Two Methods for Determination of Thallium in Sewage Sludge

城市污泥中有毒有害重金属铊经焚烧后排入大气中会造成环境污染和破坏,因此准确测定可燃城市污泥中铊的含量具有重要意义。本研究分别采用电感耦合等离子体发射光谱法和石墨炉原子吸收分光光谱法测定城市污泥中的铊,并进行质量控制研究。结果表明,两种方法对固体废物中铊的测定具有良好的线性、精密度和准确度,且无显著性差异,均完全满足分析检测要求。石墨炉原子吸收分光光谱法测定铊的检出限较ICP法更低,对测定铊含量较低的城市污泥更适用。电感耦合等离子体发射光谱法线性范围宽、分析速度快,在大批量固体样品分析中更具优势。

Sewage sludge contains toxic and hazardous heavy metal thallium which can cause environmental pollution and damage when discharged into the atmosphere after incineration,so it is important to accurately determine the thallium content in combustible sewage sludge.In this study,thallium in municipal sludge was determined by inductively coupled opticalplasma emission spectrometry(ICP-OES)and graphite furnace atomic absorption spectrometry(GFAAS),and quality control studies were performed,respectively.The results showed that both methods had good linearity,precision and accuracy in the determination of lead in solid waste with no significant differences,and both fully satisfied the analytical testing requirements.The absorption method of graphite furnace atomic absorption spectrometry has a lower detection limit and is suitable for the determination of thallium in sewage sludge at lower concentrations.Inductively coupled plasma emission spectrometry has a wide linear range and fast analysis speed,which is more advantageous in the analysis of large volume solid samples.