Optimal acid digestion for multi-element analysis of different waste matrices

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Abstract

Informed planning and assessment of waste management systems requires accurate data on physical and chemical characteristics of the waste materials. For many parameters analytical standard methods already exist; however, most of these methods do not account for the specific properties of the distinct waste materials and recyclables. The purpose of this study is to evaluate the performance of different standardized microwave assisted acid digestion methods on waste samples and subsequent multi-element analysis. Six acid digestion methods were applied on a Paper & Cardboard and Composite waste matrix preparing four replicates per method. The digestates were subsequently analyzed for 20 elements using ICP-MS and ICP-OES. The measurement results were statistically evaluated using ANOVA and a ranking procedure. The ANOVA shows a significant difference between the digestion methods for 12 elements in the Paper & Cardboard matrix and for 10 elements in the Composite matrix. The ranking procedure points to different methods to be the most optimal digestion methods in the tested waste matrices. The recovery rates can vary by more than 90% among the tested digestion methods depending on the individual element. The selection of an appropriate method is therefore crucial.
Original languageEnglish
Publication date2014
Number of pages5
Publication statusPublished - 2014
Event5th International Conference on Engineering for Waste and Biomass Valorisation - Rio de Janeiro, Brazil
Duration: 25 Aug 201428 Aug 2014
Conference number: 5

Conference

Conference5th International Conference on Engineering for Waste and Biomass Valorisation
Number5
CountryBrazil
CityRio de Janeiro
Period25/08/201428/08/2014

Keywords

  • Waste characterization
  • Waste analysis
  • Heavy metals
  • Uncertainties
  • Acid digestion
  • Mulit-element analysis

Cite this

Götze, R., & Astrup, T. F. (2014). Optimal acid digestion for multi-element analysis of different waste matrices. Paper presented at 5th International Conference on Engineering for Waste and Biomass Valorisation, Rio de Janeiro, Brazil.