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Laboratory

For successful implementation of various environmental protection/management programmes, it is necessary to identify the pollution sources, conduct baseline surveys, lay down standards and build up monitoring systems. The laboratory plays a vital role for proper assessment status of an area/ a polluting source and helps in taking the required abatement measures.

The Nagaland Pollution Control Board is functioning with a ‘C’ grade laboratory and is in the process of upgradation to a higher grade. At present the laboratory is equipped with instruments to analyze air, water and soil.

 

A list of parameters analysed in the Laboratory together with the methodology used for analysis with available instruments are mentioned below:

 

Methodology Employed for Analysis of Water Samples:

(A) Physical Parameters 

Sl. No. Parameters Method
1  pH  pH Meter
2  Conductivity  Conductivity Meter
3 TDS  Gravimetric
4 TSS Gravimetric
5 Colour
6 Temperature  Thermometer
7 Turbidity  Nephelometric

(B) Chemical Parameters

Sl. No. Parameters Method
1 Acidity Color Indicator titration
2 Alkalinity Color Indicator titration
Phenolpthalien Alkalinity Color Indicator titration
3 Biochemical Oxygen Demand Three day BOD at 27 degree Celsius
4 Chemical Oxygen Demand
5 Total Kjeldahl Nitrogen
6 Nitrate UV spectrophotometer using test kit
7 Ammonical Nitrogen
8 Chloride Titrimetric (Argentometric)
9 Dissolved Oxygen Winkler titrimetric-azide-modification (Iodometric)
10 Total Hardness Titrimetric (EDTA)
11 Calcium Titrimetric (EDTA)
12 Magnesium By difference (between total hardness and calcium determined titrimetrically)
13 Phosphate a.    Orthophosphate-Pretreatment followed by Colorimetric (Stannous-Chloride or Vanadium Molybdate)

b.    Polyphosphate -do-

c.    Total -do-

14 Sodium Flame photometer
15 Potassium UV spectrophotometer using test kit
16 Sulphate UV spectrophotometer using test kit
17 Iron UV spectrophotometer using test kit
18 Flouride UV spectrophotometer using test kit
19 Copper UV spectrophotometer using test kit
20 Chromium UV spectrophotometer using test kit
21 Zinc UV spectrophotometer using test kit
22 Nickel UV spectrophotometer using test kit
23 Arsenic UV spectrophotometer using test kit
24 Lead UV spectrophotometer using test kit
25 Boron UV spectrophotometer using test kit
26 Cadmium UV spectrophotometer using test kit

 

Apart from analysis of water pollutants, the Board is also equipped to analyze air samples. The parameters with their method of estimation are given below:

 

Sl. No. Parameters Method
1 Respirable Suspended Particulate Matter Respirable Particulate Matter Sampler
2 Suspended Particulate Matter High Volume Sampling
3 Nitrogen dioxide Sodium Arsenite Method
4 Sulphur dioxide Modified West and Gaeke Method

 

 

The NPCB also carried out ambient air monitoring in areas where stone crushers are located to study the impact to human health.

Under the air laboratory, vehicular pollution testing for both petrol and diesel is also carried out in an interval for study purpose.

 

 

WEATHER MONITORING STATION

Meteorology plays a vital role in the study of air pollution. Thus, for comprehensive air quality management, the NPCB has established an automatic weather monitoring station at its office-cum-laboratory in Dimapur and in Kohima located at Opposite War Cemetery and has started monitoring meteorological parameters viz., temperature, humidity, rainfall, wind speed and wind direction.