Figure 32.  Plots of copper and lead against zinc (Bonnet Carré Spillway)

a.  Plot of Cu against Zn for data of Sarkar (1995) and Demcheck and others (1996). The regression line refers to sediments from nationally distributed coastal sediment monitoring sites (NS&T, 1996). Most of Lake Pontchartrain samples are shown to have metal values less than those of the mean for naturally occurring shales.

b.  Plot of Pb against Zn for data of Sarkar (1995) and Demcheck and others (1996). The regression line refers to sediments from nationally distributed coastal sediment monitoring sites (NS&T, 1996). Most of Lake Pontchartrain samples are shown to have metal values less than those of the mean for naturally occurring shales.

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