Table 1. Relevant Published Various Methods of PCB Detection.

method	linear range (M)	detection limit (M)	reference
gas chromatography–mass spectrometry	6.8 × 10–11 to 8.6 × 10–7	9.2 × 10–12	(5)
liquid chromatography–mass spectrometry		1.6 × 10–10	(37)
surface-enhanced Raman spectroscopy aptamer sensor	3.3 × 10–8 to 1.0 × 10–6	3.3 × 10–8	(38)
electrochemical aptamer-carbon nanotube biosensor	1.9 × 10–7 to 8.8 × 10–6	1.2 × 10–8	(18)
electrochemical aptamer/Au biosensor	6.8 × 10–10 to 6.8 × 10–7	3.4 × 10–11	(13)
electrochemical oxide graphene/β-cyclodextrin polymer	1.0 × 10–12 to 1.0 × 10–5	5.0 × 10–13	(39)
electrochemical β-cyclodextrin/400 nm-diameter gold electrode	1.0 × 10–15 to 1.6 × 10–14	2.1 × 10–16	(40)
electrochemical ATA/BDD biosensor	1.0 × 10–15 to 1.0 × 10–11	3.2 × 10–16	this work