Precision determination for the specific oxygen uptake rate (SOUR) method used for biological stability evaluation of compost and biostabilized products

This work represents the first attempt to evaluate the precision of the specific oxygen uptake rate method expressed in terms of repeatability ( r) and reproducibility limits ( R). Three laboratories were involved in an inter-laboratory test for the validation of respiration analyses on six biomass...

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Bibliographic Details
Published in:Bioresource technology 2007-02, Vol.98 (3), p.706-713
Main Authors: Scaglia, B., Erriquens, F.G., Gigliotti, G., Taccari, M., Ciani, M., Genevini, P.L., Adani, F.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Biological stability
Biostabilized products
Compost
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries
Oxygen - metabolism
Oxygen uptake
Precision
Repeatability
Reproducibility
Reproducibility of Results
Soil
Soil-plant relationships. Soil fertility. Fertilization. Amendments
SOUR
Temperature
Time Factors
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Summary:This work represents the first attempt to evaluate the precision of the specific oxygen uptake rate method expressed in terms of repeatability ( r) and reproducibility limits ( R). Three laboratories were involved in an inter-laboratory test for the validation of respiration analyses on six biomass samples (three composts and three biostabilized products) having different degrees of biological stability. Both the maximum specific oxygen uptake rate peak (SOUR) and the cumulative oxygen demand after 12 h (OD 12) and 20 h (OD 20) of respiration test were investigated. Precisions expressed as the relative standard deviation were in the range of 9–41%. Linear regressions found for r and R, versus OD 12 and OD 20, enabled derivation of precision values ( r and R) for all respirometric levels within the operating range. The OD 12 and OD 20 indices were found to be more adequate to indicate biological stability since they were less influenced by random errors than the SOUR index.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2006.01.021