Evaluating heavy metal contents in nine composts using four digestion methods
Evaluating heavy metal contents in nine composts using four digestion methods
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DOI：
10.1016/j.biortech.2004.02.008
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发表时间：
2004-10-01
影响因子：
11.4
通讯作者：
Hseu, ZY
中科院分区：
文献类型：
--
作者：
Hseu, ZY
堆肥的生产和应用可能会对环境造成重金属污染。堆肥中的重金属含量必须准确测定。因此，本研究旨在了解堆肥中的重金属含量，使用不同的消化方法，并推荐最合适的消化方法进行此测量。选取9种不同来源的堆肥，包括猪粪、鸡粪、餐厨垃圾、城市污泥、豆粕、木屑、肉骨粉、鱼骨粉和鸟粪，采用4种消解方法，用原子吸收光谱法测定其中Cd、Cr、Cu、Mn、Ni、Pb和Zn的含量。四种消解方法分别为硝酸法、干灰化法、硝酸-高氯酸法和硫酸法。分析结果表明，硝酸程序是最有效的回收镉，锰和镍从大多数堆肥样品。硫酸的程序产生了最低的回收率的铅从认证的参考材料（BCR 146）和堆肥样品，特别是从堆肥具有高pH值和EC值可能高的钙。基于回收率分析、成本和所需时间，推荐硝酸程序作为消化堆肥的方法。建议采用干法灰化作为一种灵活的方法。不推荐硝酸-高氯酸程序，因为高氯酸在消化过程中具有潜在危险，并且回收的重金属相对较少。(C)2004爱思唯尔有限公司保留所有权利。
The production and application of compost potentially contaminate the environment with heavy metals. The heavy metal contents of composts must be exactly determined. Therefore, this study aims to understand the heavy metal contents in composts, using different digestion methods and to recommend the most appropriate digestion method making this measurement. Nine composts from different sources, including swine manure, poultry litter, food waste, municipal sewage sludge, soybean meal, wood residues, flesh-bone dust, fish-bone meal and guano, were selected to be digested by four methods to determine the contents of Cd, Cr, Cu, Mn, Ni, Pb and Zn by AAS. The four digestion methods were nitric acid, dry ashing, nitric-perchloric acid and sulfuric acid methods. Analytical results indicated that the nitric acid procedure was the most efficient for recovering Cd, Mn and Ni from most compost samples. The sulfuric acid procedure yielded the lowest recovery of Pb from the certified reference material (BCR 146) and the compost samples, especially from the composts with high pH and EC values potentially high in Ca. The nitric acid procedure was recommended as the method for digesting the composts herein, based on recovery analysis, cost and time taken. Dry ashing was recommended as a flexible method. Nitric-perchloric acid procedure was not recommended because perchloric acid is potentially hazardous during digestion and it recovers relatively little heavy metal. (C) 2004 Elsevier Ltd. All rights reserved.