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Air Unit


The Air Unit plays a leading role in providing analytical services and consultancy in air quality monitoring. The samples analyzed mainly consist of wet deposition and dry deposition samples which are received from Malaysian Meteorological Department. The unit is also involved in providing analytical support services for the international air quality monitoring.


Acid Deposition can be distinguished by two pollutants process; wet deposition and dry deposition. Acid deposition occurs when pollutions such as SO 2 and NO 2 are emitted to the atmosphere, converted to H 2SO 4 and HNO 3 and fall onto the ground in the form of dry and wet deposition.

Wet Deposition can be deposited as rain, snow and mist, while dry deposition deposited as dust. The main effects that can be seen from the acid deposition are haze, lost of aquatic flora and fauna population, monument and corrosion of monuments and historical building.

Analytical services

Type of samples  Main Parameters
Wet fallout pH conductivity, Anion (Cl, NO 3, SO 4), Organic acid (Formate, Acetate, Oxalate), Cation (Na, NH4, K, Mg, Ca),Trace metals (Hg, Cu, Fe, Mn, Ni, Pb, Zn, Cd)
Dry Fallout
* Dust Dust weight, Metals (Pb, Zn, Mn, Cu, Fe, Ni, Mg, Ca, Hg)
* Filterpack Particles (Cl, NO 3, SO 4, Na, NH 4, K, Mg, Ca) Gaseous (HCl, HNO 3, SO 2, NH 3)
* Passive sampler Gaseous (SO 2, NO 2, NH 3, HNO 3, Oxalate)


Analytical support services for The International Air Quality Monitoring

Acid Deposition


Figure shows the mechanism of acid deposition

Wet fallout

Examples of wet fallout samples

Preparation of standard calibration for wet fallout analysis


pH and conductivity analyses for wet fallout samples


Ion Chromatography for the analysis of anions



Ion Chromatography for the analysis of cations


Sample for dust weight analysis

Procedure for wash out of dust from container for analysis

Procedure for filtering of dust



Filterpack samples for analysis

Process of filter impregnation for sampling


Preparation of filters for extraction

Determination of cations by Ion Chromatography

Passive Sampler  

Samples of passive samplers

Filter coating process for sampling

Preparation of filters for analysis

Main Effects  


Haze in KL


Effects on aquatic life taken from acidic lake (left) and

from normal pH lake (right)


Corroded of stone statue caused by acid rain

Courses  attended  in Japan and Thailand  

Photograph taken during attending course at Thailand

Photograph taken during practical in Japan

Meeting with client and experts from overseas  

Meeting with experts from overseas held in Department of Chemistry

Updated: July 27, 2016 at 2:27 am