Metals scavenged behaviour

Clearly, the removal mechanisms have an appreciable effect on dissolved elemental abundances. The two major processes in operation are uptake by biota and scavenging by suspended particulate material. In the first instance, the constituent mimics the behaviour of nutrients. This is evident in the metal/nutrient correlation for Cd/P and Zn/Si (Figure 12). 

The chemistry of dissolved metals in seawater can be grouped into three classes, which describe the behaviour of the metal during chemical cycling. These classes—conservative, nutrient-like and scavenged—have been recognized by the shapes of concentration profiles when plotted against depth in the oceans. 

The strong reducing behaviour of vitamin C is based on its enediol structure (Fig. 16.1). The oxidation of ascorbic acid is a two-step process in which semi-dehydroascorbic acid, a strong acid (dimmer form), is involved. This intermediate acts as a radical scavenger. The autoxidation of ascorbic acid is catalysed by transition metal ions" and dehydroascorbic acid is formed in the presence of oxygen. ... 

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