Selective sequential dissolution for trace elements in arid zone soils

SELECTIVE SEQUENTIAL DISSOLUTION FOR TRACE ELEMENTS IN ARID ZONE SOILS 

1 SELECTIVE SEQUENTIAL DISSOLUTION CHARACTERIZATION, ADVANTAGES, AND DISADVANTAGES 

The basic assumption behind the sequential dissolution methods is that a particular extractant is phase or retention mode specific in its chemical attachment on a mixture of forms (D Amore et al., 2005). The procedure 

There are a number of selective sequential dissolution procedures which have been developed for specific elements, matrices, regional soils, and specific purposes (Table 4.1). Additionally, various extractants are used in different sequential procedures for the similar targeted solid-phase component. The review on the extractants of individual fractions of metals in soil was made by Shuman (1991). However, in most protocols the trace elements/heavy metals in their native and waste-amended soils are divided into the following physicochemical forms  

1) Simple or complexed ions in solution in equilibrium with exchangeable and other phases. 

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