Optimization of digestion methods for sewage sludge using the Plackett-Burman saturated design |
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Authors: | I Lavilla B Pérez-Cid and C Bendicho |
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Institution: | (1) Departamento de Química Analítica y Alimentaria, Universidad de Vigo, Facultad de Ciencias (Química) As Lagoas, Marcosende s/n, F-36200 Vigo, Spain, ES |
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Abstract: | The Plackett-Burman saturated factorial design was used to select optimized dissolution conditions for sewage sludge samples.
Three different digestion methods were applied: i) microwave oven digestion in a domestic oven with Parr-type reactors; ii)
microwave oven digestion with controlled-pressure reactors; iii) pressure bomb reactor heated on a hot plate. The three methods
were validated by statistically comparing the metal contents found with the certified ones of the sewage sludge sample (BCR
145R). No significant differences were obtained and the RSD values were lower than 3% in all cases. The metals were determined
by flame-AAS. The variables studied were the following: microwave power; digestion time; predigestion; volume of hydrochloric
acid; volume of hydrofluoric acid; volume of nitric acid. The operative advantages offered by microwave digestion with controlled-pressure
reactors were also considered.
Received: 23 July 1997 / Revised: 31 October 1997 / Accepted: 5 November 1997 |
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