Table 7. Comparision of heavy metal concentrations (mg/kg, ww) of shellfishes from Korea and foreign countries

Country	Heavy metal (mg/kg, ww)								Reference
	Pb	Cd	As	Cr	Cu	Ni	Zn	Hg
Korea	0.761–1.708	0.168–0.247	–	0.682–1.645	3.914–6.484	0.785–1.998	40.36–77.98	–	Hwang et al., 2001
Korea	0.763–1.306	0.128–0.298	–	0.648–1.346	8.89–27.48	0.810–1.856	97.9–217.0	–	Hwang et al., 2002
Korea	0.045–0.210	0.198–2.654	–	ND	1.385–9.985	–	–	–	Kim et al., 2002
Korea	Trace–0.984	0.030–0.617	–	Trace–0.849	–	–		0.002–0.020	Kim et al., 2003
Korea	ND–1.38	ND–1.85	–	–	–	–	–	ND–0.19	Ham, 2002
Korea	0.5471–1.1571	0.1748–0.3529	–	0.4280–0.9300	–	–	–	0.0057–0.0203	Ha & Song, 2004
Korea	0.061–0.246	0.010–0.256	0.095–3.545	–	–	–	–	0.002–0.052	KCA, 2011
India	ND	0.1	–	0.9	6.5	0.8	15.7	ND	Sankar et al., 2006
Greece	0.68	0.34	–	0.26	1.4	0.34	40	0.024	Copat et al., 2013
China	0.033–0.243	0.027–0.329	0.216–0.807	–	1.31–9.11	–	3.34–17.90	0.006–0.022	Huang et al., 2007
Malaysia	0.18–0.88	0.04–5.45	0.95–22.10	0.47–3.39	–	0.37–2.23	–	–	Sharif et al., 2016
Egypt	0.2–17	0.04–1.7	–	–	0.9–137	7.8–41	41–192	ND–0.2	Nemr et al., 2016

Pb, lead; Cd, cadmium; As, arsenic; Cr, chromium; Cu, copper; Ni, nickel; Zn, zinc; Ag, silver; Hg, mercury; ND, not detected.