7. How would you carry out the following analyses? Describe the
necessary sample preparation steps and your choice of appropriate
analytical instrumentation:
a. Simultaneous determination of Pb, Zn, Cr, and Cd in crops
grown in soil treated with sewage sludge.
b. Determination of pesticide residues in apples.
c. Determination of Pb in human plasma.
d. Determination of SO4-2,
NO3-, and PO4-3 in
compost to be used for lawn fertilizer.
e. Screening for gasoline contamination around underground
storage tanks.
f. A...