Laboratory ::

The State Pollution Control Board, Assam has one Central Laboratory attached to Head office at Bamunimaidam, Guwahati and 4 (four) Regional Laboratories attached to the Regional offices at Sibsagar, Tezpur, Silchar and Bongaigaon under it equipped with manpower and equipments for analysis of environmental pollution related parameters for regular pollution control enforcement and for scientific research in the field.

Central Laboratory

The Central Laboratory has mainly five sections : viz, Water Section, Wastewater section, Bacteriology Section, Bio-monitoring & Bioassay Section and Air Section. This Laboratory is equipped with a few sophisticated instruments for analysis of water, air and solids for all possible pollutants and is the referral laboratory for the Board. A list of parameters analysed in the Central Laboratory together with the methodology used for analysis with available instruments are mentioned below:


Methodology Employed for Analysis of Parameters

(A) Physical Parameters
S. No.
Parameters
Method
1
Colour
Visible Comparison Method (only potable waters)
2
Conductivity
Conductivity Meter
3
pH Value
pH Meter
4
Suspended Solids (Total Number filterable)
Membrane filter apparatus (Millipore vacuum filtration apparatus)
5
Settleable Solids
Imhoff concentration: By Volume (mg/L)
6
Sludge Volume Index
Imhoff conc. Membrane filter apparatus or Gooch crucible
7
Total Solids
Gravimetric
8
Temperature
Thermometer
9
Turbidity
Nephelometric

(B) Chemical Parameters
S. No.
Parameters
Method
1
Acidity
a. Electrometric/Potentiometric titration
b. Color Indicator titration
2
Alkalinity
a. Electrometric/Potentiometric titration
b. Color Indicator titration
3
Ammonical Nitrigen
a. Distillation followed by colorimetric method   (Nesselerization
b. Distillation followed by titrimetric method
c. Distillation followed by ion selective electrode     Method.
4
Arsenic
Silver Diethyl dithiocarbonate
5
Boron
UV-VIS Spectrophotometer
6
 Carbon Dioxide Titrimetric
7
 Cadmium Atomic Absorption Spectrophotometer
8
 Chemical Oxygen Demand Dichromate Reflux
9
 Biochemical Oxygen Demand Three day BOD at 27 degree Celsius
10
 Chloride Titrimetric (Argentometric or Mercuric Nitrate)
11
 Chloride Residual Titrimetric
12
 Calcium Titrimetric (EDTA
13
 Chromium a. Atomic Absorption Spectrophotometer (For Total)
b.Colorometric (Diphenylcarbazide) (For hexavalent, trivalent and total
14
 Copper a. Atomic Absorption Spectrophotometer
15
 Dissolved Oxygen Winkler titrimetric-azide-modification (Iodometric)
16
 Fluoride

a. Distillation followed by Colorimetric(SPADNS)
b. Distillation followed by Fluoride Selective Electrode.
17
 Hardness Total Titrimetric (EDTA)
18
 Iodine Colorimetric (Leuce Crystal violet of Catalytic reduction)
19
 Iron Colorimetric (Phenanthroline)
20
 Lead Atomic Absorption Spectrophotometer
21
 Manganese Atomic Absorption Spectrophotometer (Total)
22
 Magnesium By difference (between total hardness and calcium determined titrimetrically)
23
 Mercury Flameless (cold vapour) Atomic Absorption (Mercury Analyzer)
24
 Nickel Atomic Absorption Spectrophotometer
25
 Nitrite Nitrogen Colorimetric (Diazotization)
26
 Nitrate Nitrogen Colorimetric (Chromotropic Acid)
27
 Oil & Grease Gravimetric (Simple extraction)
28
 Phosphate a. Orthophosphate-Pretreatment followed by Colorimetric (Stannous-Chloride or Vanadium Molybdate)
b. Polyphosphate - -do-
c. Total - -do-
29
 Phenols Distillation followed by Colorimetric(4-Aminoantipyrine) or (Chloroform extraction)
30
 Potassium Flame photometer
31
 Silica Colorimetric (Heteropoly blue or Molybdosilicate)
32
 Sodium Flame photometer
33
 Sulphite Titrimetric (Iodometric)
34
 Sulphate Turbidimetric
35
 Zinc Atomic Absorption Spectrophotometer
 
 
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