Heavy Metals Pollution and Pb Isotopic Signatures in Surface Sediments Collected from Bohai Bay, North China

Table 3

Comparison of Pb isotope ratios of surface sediments in Bohai and other sources in environment.

Sample	^206Pb/^207Pb	^208Pb/^207Pb	Reference
Sediments in Bohai Bay	1.159–1.185 (average 1.176)	2.456–2.482 (average 2.473)	In this study
Natural sources	1.178–1.202	2.462–2.526	In this study
Ores in this region	1.143–1.205	2.446–2.494	[21]
Vehicle exhaust (leaded)	1.099	2.4349	[22]
Vehicle exhaust (unleaded)	1.1468	2.4358	[22]
Unburned coal	1.1628	2.4548	[22]
Air deposition	1.150–1.194	2.428–2.485	[16]