Table 1. Chemical composition of the green polyethylene before and after 120 d of exposure to sunlight.

Mineral Composition*	Exposure time to sunlight (days)
	0	120
Si	41.19 A	35.83 B
Mn	8.51 A	7.41A
Fe	7.74 A	6.73 A
Co	6.31 A	5.49 A
Cu	3.05 A	2.65 A
Zn	8.08 A	7.03 A
Cd	22.06 A	19.19 B
N	2.80 A	2.44 A

* Relative concentration of elements ((weight %) at the surface of the plastic bags, analyzed by scanning electron microscopy coupled to X ray diffraction (semi-quantitative method). Means followed by different letters within the same line differ at Tukey test (P<0.05).