Problem 18
Why were lead compounds used in paints? Why were mercury compounds used in paints?
Problem 19
Explain why heavy metal compounds such as \(\mathrm{PbS}_{\text {and }} \mathrm{PbCO}_{3}\) are much more soluble in acidic water.
Problem 22
Discuss the toxicity of lead, especially with respect to its effects on reproduction and intelligence. Which subgroups of the population are at particular risk from lead?
Problem 23
What are the main sources of cadmium in the environment?
Problem 25
Describe what is meant by itai-itai disease and discuss where it arose and why.
Problem 26
What is metallothionein? What is its significance with respect to cadmium in the body?
Problem 27
What are some uses of arsenic that result in contamination of the environment? What lead compounds were used as pesticides?
Problem 28
What are the main health concerns about arsenic in drinking water? Why is the drinking water in many regions of Bangladesh heavily polluted with arsenic?
Problem 29
Describe the difficulties in setting healthbased drinking-water standards for arsenic.
Problem 30
What organic compounds of arsenic are of environmental significance? Why is arsenic in organic acid forms not very toxic to humans?
