[neon flash!]

need help with the following.
our recomended course text was van loon duffy "environmental chem a global perspective"

6a)List two potentially toxic metals and two metalloids of environmental importance found in soil.
calcium, phosphate (phosphorus), nitrate, magnesium?

b)Explain why soil can have different concentrations of metal(loid)s from natural sources. Consider speciation and soil constituents
all i could find in my notes was:
Factors which can influence the metal concentration in soil:
Microbial activity
Nature of parent rock
Pedogenic processes
Organic content of soil
Clay content and clay mineral composition
Proportion of Fe containing minerals
pH
Soil topography
Weather conditions
External pollution

and

there are too many species in soil to sepatate. fractination is an option.

d) Explain which physico-chemical constants are important in the prediction of xenobiotic behaviour in soils.
no idea
 
7a) Explain the function of the black smoker with regards to the redox chemistry of the most abundant elements.
so the most important compound to do with black smokers is sulphide. dont know what to write in regard to the "redox chemistry"

b)Give a depth profile of certain elements in the open ocean which would suggest the occurrence of a black smoker on the seafloor and explain the features of the profile.

no idea.
i know what an depth profil looks like with conc on x axis and depth on y axis. so i need to draw one for the suphur/sulphide but idk what it is supposed to look like

[neon flash!]

8c)Anthracene, benzene and methyl tert-butylether have to be assessed for their mobility in the environment. The following constants were determined at 25 oC:
Kow (105, 102, 101), p (< 1, 100, 245 mm Hg), t1/2 in aerobic water according to STURM (40 d, 7 d, 250 d)

Give an outline of an experimental procedure to determine Kow, p and t1/2.

should there be an equation or somehting? all i can find in my notes is a graph of degredation (y) vs time (x)