1. A chemical industry reports emissions of the following gases released each day to the environment:

3 kg per day (kg/day) CO2
0.5 kg/day CO
0.2 kg/day CH4
0.15 kg/day C2H4
0.05 kg/day C4H6
1 kg/day SO2
1.2 kg/day NO2
If the industry is working 24 hours every day of the year calculate the annual impacts of the industry through the following indices:
(a) Global Warming Potential in carbon dioxide equivalent, accounting only for direct emissions (1 mark)
(b) Terrestrial Acidification Index in SO2 equivalent, using the hierarchist LCA model (0.5 mark)
2. Explain the global mercury cycle and why mercury is an environmental concern. (200 words maximum, 1.5 mark)
3. The oxides of nitrogen (NOx) are classified as the highest risk posing substances by the National Pollutant Inventory (see http://www.npi.gov.au/resource/technical-advisory-panel-report).
Explain why. (300 words maximum, 2 marks)
4. Explain the mechanism of stratospheric ozone depletion (200 words maximum, 1.5 marks)
5. In which of these conditions you would expect cyanobacterial algal bloom to occur:
(a) total phosphorus = 0.008 mg/l; total nitrogen = 0.2 mg/l; T = 19oC
(b) total phosphorus = 0.032 mg/l; total nitrogen = 0.5 mg/l; T = 19oC
(c) total phosphorus = 0.08 mg/l; total nitrogen = 1.5 mg/l; T = 20oC
(d) total phosphorus = 0.04 mg/l; total nitrogen = 0.9 mg/l; T = 16oC

In 1 to 2 sentences explain why. (1 mark)
6. Explain human exposure pathways to atmospheric particular matter. (100 words maximum, 1 mark)
7. What is the toxicity equivalency factor relative to TCDD for the following chemical compound:

With 1-2 sentences support your answer (0.5 marks).

8. You need to classify a non-liquid waste according to the NSW Environmental Guidelines: Assessment, Classification & Management of Liquid and Non-liquid Wastes (1997) and based on the trace
element analysis shown in Table 1. How would you classify the waste. Provide 1 sentence justification (1 mark)
Table 1: Trace element analysis of the waste (mg/kg)
Arsenic
Boron
Antimony
Selenium
Silver
Cadmium
Barium
Beryllium
Cobalt
Chromium(VI)
Copper
Lanthanum
Manganese
Molybdenum
Nickel
Lead
Tin
Strontium
Vanadium
Yttrium
Zinc
Zirconium 7.2
24
6.7
18
35
14
420
1
350
95
420
24
140
35
35
85
80
100
25
8
800
60