Assessment of CB biochemical quality variation during decomposition.

<p>Variation in seven main classes of organic carbon assessed by ¹³C-CPMAS NMR spectroscopy in undecomposed cigarette butts and after 720 days of decomposition under laboratory and field conditions. Data refer to mean ± standard deviation (<i>N</i> = 3). No statistically significant differences were recorded (Duncan’s test at <i>P</i> < 0.05).