CARBONACEOUS AEROSOLS

PRAVEEN KUMAR MISHRADepartment Of Geology

Banaras Hindu University

Atmospheric aerosols are fine particles (nm to m) of solid and liquid suspended in air with residence time of about week in lower

troposphere.

Sulphate, Nitrate, Mineral matter (qtz. Dust, carbonate),

carbonaceous material…….

CARBONACEOUS AEROSOLS

ORIGIN

PRIMARY SOURCES SECONDARY SOURCES

Natural AnthropogenicGPC

CLASSIFICATION OF CARBONACEOUS AEROSOLS

ELEMENTAL CARBON Carbonate

Bicarbonate

Water solubleWater insoluble

INORGANIC CARBON

ORGANIC CARBON

•On the basis of size of Particle

•PM2.5

•PM10

•On the basis of their Composition

EC-OC Analyzer TOC Analyzer

EC-OC ANALYZER

•Based on thermal and optical property of material.

• EC: those fraction of carbon which are volatilise at >550°C temperature in presence of oxygen.

•OC: fraction of carbon which are volatilised at low temperature.

TOC ANALYZER

•It measure soluble fraction of organic carbon in water.

• Based on simple principle of oxidation.

TOC = TC-IC

Platinum catalyst

150ml/min

Acidified solution

0

10

20

30

40

50

60

PM2.5

OC (µg m-3)

16-M

ay-0

723

-May

-07

23-M

ay-0

730

-May

-07

30-M

ay-0

706

-Jun

-07

13-J

un-0

713

-Jun

-07

19-J

ul-0

725

-Jul

-07

01-A

ug-0

723

-Aug

-07

10-S

ep-0

720

-Sep

-07

03-O

ct-0

710

-Oct

-07

17-O

ct-0

718

-Oct

-07

24-O

ct-0

724

-Oct

-07

31-O

ct-0

708

-Nov

-07

09-N

ov-0

709

-Nov

-07

14-N

ov-0

714

-Nov

-07

24-N

ov-0

725

-Nov

-07

30-N

ov-0

730

-Nov

-07

06-D

ec-0

706

-Dec

-07

13-D

ec-0

728

-Dec

-07

08-J

an-0

817

-Jan

-08

25-J

an-0

801

-Feb

-08

07-F

eb-0

807

-May

-08

15-M

ay-0

822

-May

-08

28-M

ay-0

810

-Jun

-08

20-J

un-0

822

-Jul

-08

04-S

ep-0

822

-Sep

-08

07-O

ct-0

815

-Oct

-08

0

5

10

15

20

25

PM2.5

EC (µg m-3)

DATE

•Temporal variation of OC and EC in PM2.5

•Abundance of OC and EC high during Oct.,07-Feb.,08 low during May, 07 to Sept.,07 and also during May,0 to Oct.08

•Seasonal Variation

0

10

20

30

40

50

60

70

PM10

OC (µg m-3)

16-M

ay-0

723

-May

-07

23-M

ay-0

730

-May

-07

30-M

ay-0

706

-Ju

n-0

713

-Ju

n-0

713

-Ju

n-0

719

-Ju

l-07

25-J

ul-

0701

-Au

g-0

723

-Au

g-0

710

-Sep

-07

20-S

ep-0

703

-Oct

-07

10-O

ct-0

717

-Oct

-07

18-O

ct-0

724

-Oct

-07

24-O

ct-0

731

-Oct

-07

08-N

ov-

0709

-No

v-07

09-N

ov-

0714

-No

v-07

14-N

ov-

0724

-No

v-07

25-N

ov-

0730

-No

v-07

30-N

ov-

0706

-Dec

-07

06-D

ec-0

713

-Dec

-07

28-D

ec-0

708

-Jan

-08

17-J

an-0

825

-Jan

-08

01-F

eb-0

807

-Feb

-08

07-M

ay-0

815

-May

-08

22-M

ay-0

828

-May

-08

10-J

un

-08

20-J

un

-08

22-J

ul-

0804

-Sep

-08

22-S

ep-0

807

-Oct

-08

15-O

ct-0

8

0

5

10

15

20

PM10

EC (µg m-3)

EC (µg m-3)

0 5 10 15 20 25

OC (µ

g m

-3)

0

20

40

60

80

PM2.5PM10

•Plot between concentration of OC and EC

• Originated from same point

•Straight line

Date

May Jun Jul Aug Sep Oct

WS

OC

1

2

3

4

5

6

7

WSOC (g/m3) PM10

Date

May Jun Jul Aug Sep Oct

WS

OC

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

WSOC (g/m3)PM2.5 •Soluble fraction of OC

•Peak during June and AugustIndicating photochemical rk.i.e. GPC

Abundance of Carbonaceous aerosols are affected by seasons.

OC and EC concentration are increases during winter season.

OC and EC concentration are decreases during rainy season.

Increase in concentration of WSOC is directly related with OC.