lect 13

Question 1

what is the water crisis in flint, michigan?

Answer 1

lead contamination in flint, michigan (2014)
-this past summer, one sample had lead levels that reached a staggering 13,200 ppb. ca. 900x higher than the 15-ppb US-EPA regulatory limit

Question 2

what was the lead concentration of children in flint michigan?

Answer 2

-high lead concentrations in water, ca.10% of the children had elevated blood levels of Pb.
-lead is neurotoxic and can disrupt children’s development, leading to behavioral problems and decreased intelligence

Question 3

Answer 3

Question 4

how was corrosion related to what happened in flint michigan?

Answer 4

-switching of flint’s water supply led to changes in the composition of the water (pH and absence of inhibitor)
-the increased pH lead to dissolving of the passivating mineral coating (PbPO4, PbCO3) inside the pipes, leading to dissolution and leaching of metal from the pipes
-lowering of the chlorine levels occurred which reduced. The disinfection capability of the water and growth of microbes, aside from elevated lead and iron levels in the water

Question 5

Answer 5

Question 6

what are the kinetics release of Pb?

Answer 6