air sampling

Question 1

1.Air pollution

Answer 1

the presence of contaminants, of biological or chemical nature, at [ ] and duration levels that are large enough to interfere with the enjoyment of life and propert, and become evident as damage to buildings animal and plant life

Question 2

Negative Effects of Air Pollution (5)

Answer 2

1. Reduced visibility
2. Low growth rates in veges
3. Lower photosynthetic rates
4. Respiratory, ear, nose, throat, illness
5. corrosion of structures

Question 3

Categories of Air samples55 4

Answer 3

1. ambient air
2. source (emission)
3. indoor air
4. atmospheric (soil air)

Question 4

General considerations in Air sampling 5

Answer 4

1. Meteorological (thời tiết) conditions
2. Air pollutant properties
3. sample collection time & volume
4. Pollutant concentration
5. Time of day - divinal (đoán) dispersion

Question 5

Why air sampling depends on time of the day

Answer 5

bc in the evening, decrease downwind dispersion, higher downwind [ ] than in the daytime
site activities may be detected
the sampling duration may need to be lengthened

Question 6

Equipment 1- Whole air

Answer 6

• Canister, gas bottles, syringes, gas (tedlar) bag

- Used when [ ] is constant in short period

Question 7

Equipment 2 - Active sampling

Answer 7

• Pump, sorbent tubes (break thru)
• Used for hazardous compounds CH3O, Nox, O3
• Works on the principles of adsorption and absorption

Question 8

Equipment 3 - Diffusion/ passive

Answer 8

• no pump, use passive badges (long sampling time but lightweight)
• Dependant on what you impregnate the badge with

Question 9

Equipment 4 - Direct sampling

Answer 9

• single and multi-gas monitoring systems - Eagle Hydrocarbon sniffer
• used where immediate data is needed. there are direct sensors which are costly and require calibration

Question 10

Equipment 5 - directly measure pollutant

Answer 10

• Analytical tubes
• inexpensive, no/ little training
• used for as varied as the presence of adsorbent