Temperature Effects on Soil Mineralization of Polylactic Acid Plastic in Laboratory Respirometers View Full Text


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Article Info

DATE

1999-04

AUTHORS

Kai-Lai G. Ho, Anthony L. Pometto III

ABSTRACT

A respirometric system was used to analyze the biodegradation of high molecular weight (120,000 to 200,000 g mol−1) polylactic acid (PLA) plastic films in soil under laboratory conditions. The respirometric system consisted of air-conditioning pretraps, a soil reactor, and a carbon dioxide (CO2) posttrap. A 200-g homogeneous soil mixture of all-purpose potting soil : manure soil : sand [1 : 1 : 1 (w/w)] and 1.5 g of PLA plastic films in 1 × 1-cm2 squares was added to each bottle. The respirometers were placed in a 28, 40, or 55°C water bath for 182 days. Treatments (three replicates) included native corn starch (positive control), polyethylene (Glad Cling Wrap; negative control), and three PLA films: Ca-I (Cargill Dow Polymers LLC, monolayer), GII (Cargill Dow Polymers LLC, Generation II), and Ch-I (Chronopol; monolayer). The degree of polymer mineralization was indicated by the cumulative CO2 liberated from each respirometer. The initial average mineralization rate and total percentage mineralized of the PLA plastic films at 28, 40, and 55°C was 24.3, 41.5, and 76.9 mg/day with a 27, 45, and 70% carbon loss, respectively. No decrease in soil pH was observed after 182 days of mineralization. Hence, increase in soil temperature drastically enhanced the biodegradation of PLA plastic films in soil under laboratory conditions (P < 0.0001). More... »

PAGES

101-108

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1021812418325

DOI

http://dx.doi.org/10.1023/a:1021812418325

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044459667


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