MEASUREMENT OF AMBIENT AIR POLLUTANTS: SAMPLING AND ANALYSIS
Abhishek Tiwari
11M180157
AIM
To make an estimation major air pollutants viz. PM 10, PM 2.5 , SO2 and NO2 at Analytical and Environmental Engineering Laboratory Yugantar Bharati, Namkum, Ranchi.
Understand the air monitoring and sampling technique.
To know about related equipment.
INTRODUCTION Air pollution occurs when the air contains
substances in quantities that could harm the comfort or health of humans and animals, or could damage plants and materials. These substances are called air pollutants and can be either particles, liquids or gaseous in nature (Alias M. et al, 2007).
Particulate matter and gaseous emissions of pollutant emission from industries and auto exhausts are responsible for rising discomfort, increasing airway diseases and deterioration of artistic and cultural patrimony in urban centers.
CONTI…
Ranchi is capital and one of the most important industrial cities in the state of Jharkhand. It is divided in 5 industrial zones- Tupudana industrial area, Namkum Industrial Area, Tatisilawai Industrial area, Kokar industrial area and H.E.C. with about 10 lakhs vehicles, increasing about 70000 per year in Ranchi , the city emits heavy amount of pollutants.
Thus, the ambient air quality of the city Ranchi is needed to be studied in detail as it is a major concern to care for the health of the people residing in Ranchi resulting due to pollution.
SITE:- Analytical and Environmental Engineering Laboratory Yugantar Bharati, Namkum, Ranchi.
METHODOLOGY
TRAINING SCHEDULE AND SYLLABI
Training was scheduled from 5th April 2013 to 12th
April 2013.Day 1 covered Registration, Introduction of
Equipments and their accessories, introduction to filter papers and absorbents an Review session.
Day 2 involved Preparation of Absorbents, preparation of filter papers, checklist preparation for sampling and storage and Review meeting.
Day 3 was determined as sampling date.Day 4 :- calculations/analysis of dust partials,
Analysis of gas , report preparation and review meeting.
Day 5 was for the reports submission photo session and certificate distribution.
INTRODUCTION TO EQUIPMENTS
Equipments required for the training were introduced by Mr. Sanjeev singh and Mr. mukesh singh.
Equipments required are:Respirable dust
samplerfilter paper for PM 10Filter Paper For
PM2.5Air DesecratorElectronic weight
CONTI..
SpectrophotometerLab Glass wares Gloves
RESPIRABLE DUST SAMPLER
Respirable dust sampler is an machine designed for the sampling and collection of dust and NO2 and SO2 by an attached gas manifold.
The unit separates Particulate matter by size, passing small particulate matter to filter paper and retaining the non respirable particulate matter in a cup.
It collects air at rate of 1132 lpm speed.
RESPIRABLE DUST SAMPLERModel 460 B
CONTI…..
Major parts of Respirable Dust SamplerI. Main housing :- Metallic body enclosing various
parts.II. Filter holder :- the filter holder assembly
consists hopper assembly to hold filter paper of size 8×10 inches.
III. Manometer :- The flow rate is monitored by it.IV. Time totalizer :- A time totalizer has been
provided to indicate the total time of sampling in minutes.
CONTI…….
PM 2.5 AttachmentAn attachment is added to the body which
separates and collects particulate matters of size lesser than 2.5 micron.
It has an sample cup fitted with filter paper.
CONTI……
Gas Manifold…..An Gas Manifold is attached for the sampling
of NO2 and SO2 .
Gas Manifold has glass impinger filled with absorbing solution.
It has a Rota meter which measures the Flow rate in the manifold.Generally , the flow rate is set at 1.
FILTER PAPERS
Filter Papers:- filter papers are placed in the machine to collect dust particles.
There are two types of filter papers.Filter paper made up of glass fiber of size 8×10
(Whatmann 41 GF/A) for the collection of Particulate matter of size greater than 10 µ.
Another Filter Paper is round having diameter of 47 mm made up of Teflon to collect PM 2.5.
AIR DESSICATOR
An air dessicator is used by means of moisture removal from the filter paper.
It contains silica gel which absorbs moisture and turns blue after absorbance.
SPECTROPHOTOMETER
A UV visible spectrophotometer was used for analysis of gaseous samples that is SO2 and NO2.
SAMPLING METHOD
Respirable dust sampler was set at about 3 meters height above the ground.
Both the filter papers were set at the respective sockets after moisture removal inspection and their initial weight was recorded .
Attachments were assembled on the machine.
Glass impinger of the gas manifold was filled with 30 ml each of absorbing solution for SO2 and NO2 viz. tetra chloro mercurate solution and sodium arsenate solution respectively.
CONTI…
Rota meter of gas manifold was set at 1 . Manometer was calibrated and was set up
the level by adding distilled water in the manometer.
machine was started. Time, initial flow rate of manometer and
initial volume of air at PM 2.5 attachment were recorded.
CONTI…
Machine was started at 11.00 am on 09/04/2013.
Machine was closed at 7.30 pm. Machine was disturbed 4 times which was
balanced later. Impinger of gas manifold were changed
after 8 hours.
CONTI……
After sampling, filter paper were taken out from the machine and preserved in the plastic zipper bag carefully.
Absorbing solution were taken out from the impingers and were preserved.
Next day, filter paper were weighed. SO2 and NO2 were measured.
CONTI…..MEASUREMENT OF NO2.
Take 10 ml of aliquot sample in 50 ml volumetric flask
Take 10 ml of unexposed sample in 50 ml volumetric flask
Add 1 ml hydrogen peroxide Add 10 ml sulfanilamide
Add 1.4 ml NEDA
Make up to 50 ml with distilled water
Keep 10 minutes for reaction
Set zero of spectrophotometer with distilled water
Measure absorbance at 540 nm
Calculate concentration of NO2 in µg/m3
CONTI…. MEASUREMENT OF SO2
Take 10/20 ml of aliquot sample in 25 ml vol. flask
Take 10/20 ml of unexposed sample sample in 25 ml vol. flask
Add 1 ml sulphamic acid, keep 10 minutes
Add 2 ml formaldehyde
Add 2 ml working PRA
Make up to mark 25 ml with distilled water
Keep 30 minutes for reaction
Set zero of spectrophotometer with distilled water
Measure absorbance at 560 nm
Calculate the SO2 concentration
OBSERVATIONOBSERVATION TABLE FOR PM 10
Starting time
Closing time
Filter paper code
Filter paper initial weight
Initial flow rate
Final flow rate
Filter paper final weight
11.00 AM
7.30 PM RU1 2.7610 gm
1.14 1.09 2.8140 gm
CONTI…
OBSERVATION TABLE FOR PM2.5
Starting time
Closing time
Filter paper code
Filter paper initial weight
Initial volume
Final volume
Filter paper final weight
11.00 AM
7.30 PM PT0143095
0.1525 gm
33.342 42.614 0.1530 gm
CONTI…
OBSERVATION TABLE FOR SO2
Starting time
Closing Time
Sample code
Initial flow rate
Final flow rate
11.00 AM 3.10 PM RU1- SO2 1 1
3.20 PM 7.30 PM RU2- SO2 1 1
CONTI….
OBSERVATION TABLE FOR NO2
Starting time
Closing Time
Sample code
Initial flow rate
Final flow rate
11.00 AM 3.10 PM RU1- NO2 1 1
3.20 PM 7.30 PM RU2- NO2 1 1
CALCULATIONCALCULATION OF PM 10
Time of Sampling :- 480 min.Average flow rate :- Initial flow rate+final flow
rate 2=
= 1.115 LPM
Volume of air sample :-
time of sampling × average flow rate
= 534.2 m cube
CONTI….PM 10
Dust concentration on filter paper :- 106× (Wf- Wi) vol. of air
= 106× (2.8140 – 2.7610) 535.2
= 106× 0.053 535.2
= 99.1395 µg/m3
CONTI…
Calculation of PM 2.5
Volume of air sample :- Final air volume – initial volume
= 42.614 – 33.42
= 9.272 m3
Dust concentration on filter paper :-
106× (Wf- Wi) vol. of air
= 43.9258 µg/m3
CONTI…
CONCENTRATION OF SO2
Table for absorbance and concentration of sample standard solution
Absorbance(x)Concentration(y)
0.105 0.820.122 0.960.217 1.950.328 2.960.383 3.94
CONTI…..CONCENTRATION OF SO2
Slope :- Y2 - Y1
X2 – X1
0.017 0.14
0.121
CF 8.264 ( Reciprocal of slope)
CONTI…..CONCENTRATION OF SO2
Sample code RU 1 (As – Ab)× 8.26 × 30
Va × Vt (0.015 – 0.006) × 8.264 × 30
2.435.70048 2.4
0.9297 µg/m3
CONTI..CONCENTRATION OF SO2
Sample code RU2(As – Ab)× 8.26 × 30
Va × Vt(0.026 – 0.006) × 8.264 × 30
2.4
2.06 µg/m3
CONTI….
CONCENTRATION OF NO2
Table for absorbance and concentration of sample standard solution
Absorbance(x)Concentration(y)
1.02 0.0413.93 0.0627.05 0.13410.09 0.20512.97 0.243
CONTI… CONCENTRATION OF NO2
CALCULATION OF CALIBERATION FACTOR FOR NO2
SLOPE :- Y2 – Y1
X2 – X1 0.041 – 0.062 1.02 – 3.92
0.007 CALIBERATION FACTOR 142.8571 ( Reciprocal of
Slope)
CONTI…. CONCENTRATION OF NO2
Sample code RU1
(As – Ab) × CF × Vol. Va × Vt × 0.82
(0.38 – 0.009) × 142.8571 × 300.01728 × 0.82
61.39 µg/m3
CONTI…. CONCENTRATION OF NO2
Sample code RU2
(As – Ab) × CF × Vol. Va × Vt × 0.82
(0.38 – 0.009) × 142.8571 × 300.01728 × 0.82
61.39 µg/m3
RESULTThe amount of Pollutants were recorded as
follows :- PM 10 99.1395 µg/m3 PM 2.5 43.1406 µg/m3
SO2 RU1 0.929 µg/m3
RU2 2.06 µg/m3
NO2 RU1 61.39 µg/m3
RU2 25.432 µg/m3
CONCLUSIONConcentration of pollutant at YBAEEL as
compared with CPCB norms are as below
Pollutants CPCB Standards Concentration at YBAEEL
PM 10 100 µg/m3 99.1395 µg/m3
PM 2.5 60 µg/m3 43.9258 µg/m3
SO2 80 µg/m3 RU1 0.929 µg/m3
RU2 2.06 µg/m3
NO2 80 µg/m3 RU1 61.39 µg/m3
RU2 25.432 µg/m3