Table 3.

Results of the quantitative analysis of the compounded samples, measured with the QQQ-MS

Compound	Slope (sensitivity)	Intercept	Method standard deviation	R2	LOD	LOQ
	Peak area wt%−1	Peak area	wt%		wt%	wt%
HDPE
ε-Caprolactam	6.150·103	3.735·103	0.10	0.9878	0.19	0.53
Cyclic dimer	6.901·104	5.930·103	0.04	0.9982	0.07	0.21
Cyclic trimer	4.121·106	4.340·105	0.01	0.9997	0.03	0.08
Cyclic tetramer	3.418·106	− 2.401·104	0.02	0.9996	0.03	0.10
Cyclic pentamer	9.076·105	4.106·105	0.21	0.9522	0.37	1.00
LDPE
ε-Caprolactam	3.783·103	2.150·103	0.34	0.8838	0.61	1.57
Cyclic dimer	7.875·104	− 1.098·104	0.11	0.9865	0.20	0.55
Cyclic trimer	4.049·106	− 4.267·104	0.08	0.9925	0.15	0.42
Cyclic tetramer	3.291·106	− 5.652·105	0.13	0.9817	0.23	0.64
Cyclic pentamer	7.039·105	3.181·105	0.22	0.9476	0.39	1.04
PP
ε-Caprolactam	1.428·104	5.867·103	0.14	0.9789	0.25	0.68
Cyclic dimer	1.016·105	− 1.011·104	0.06	0.9956	0.11	0.32
Cyclic trimer	4.989·106	− 3.340·105	0.03	0.9992	0.05	0.14
Cyclic tetramer	4.601·106	− 7.046·105	0.04	0.9987	0.06	0.21
Cyclic pentamer	1.023·106	4.784·105	0.36	0.8726	0.64	1.65