Table 1. The metal guideline values of two sediment quality guidelines (SQGs) used to distinguish marine sediment quality (μg g^-1).

Sediment quality guidelines	Cd	Cr	Cu	Ni	Pb	Zn	Reference
Class I upper limit	0.5	80	35	nd a	60	150	[25]
Class II upper limit	1.5	150	100	nd	130	350	[25]
Class III upper limit	5	270	200	nd	250	600	[25]
TEL guideline	0.68	52.3	18.7	15.9	30.2	124	[26]
PEL guideline	4.2	160	108	42.8	112	271	[26]

^a nd: not defined.