Ambient Air quality Monitoring Guidlines. - Maharashtra Pollution ...

7.1.6 Air Pump - Capable of maintaining a vacuum of at least 0.6 atmosphere (450
torr) across the flow control device. [This value is based on the critical pressure
differential, 0.53 atmosphere (400 torr) 6 , plus a safety factor to allow for
variations in atmospheric pressure and minor variations in pump performance].
7.1.7 Flowmeter - Properly calibrated flowmeter for measuring air flow rates in the
range of 150-250 cm 3 /min. The use of a mass flowmeter is particularly
convenient since no corrections are required when used under temperature and
pressure conditions that differ from the conditions under which it is calibrated
(see 10.1).
7.1.8 Flow Measurement Standard - Precision wet test meter (l litre/revolution),
bubble flowmeter, or other reliable standard.
7.2 Analysis
7.2.1 Volumetric Flasks - 100, 250, 500, 1,000 ml.
7.2.2 Pipets - 1, 2, 5, 10, 15, 20, 50 ml volumetric; 2 ml, graduated in 1/10 ml intervals.
7.2.3 Test Tubes - Approximately 150 mm long x 20 mm diameter.
7.2.4 Spectrophotometer - Capable of measuring absorbance at 540 nm; equipped
with 1 cm optical path length cells.
8.0 REAGENTS
All reagents should be of AR/GR quality.
8.1 Sampling
8.1.1 Distilled Water - Must be reagent water as defined by ASTM procedure 1193-66
part 6.3 (consumption of potassium per-magnate test).
8.1.2 Sodium Hydroxide.
8.1.3 Sodium Arsenite - CAUTION : Arsenic compounds are highly toxic and should
be handled with extreme care. Avoid contact with skin and especially with eyes.
Avoid generating dust or breathing dust. Keep away from food. Wash hands
after handling it. Do not take internally.
8.1.4 Absorbing Reagents - Dissolve 4.0 g of sodium hydroxide in distilled water, add
1.0 g of sodium arsenite, and dilute to 1,000 ml with distilled water.
8.2 Analysis
8.2.1 Sulfanilamide - Melting point 165 to 167 o C.
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