Laboratory

National Water Quality Monitoring Programme (NWMP)

National Ambient Air Quality Monitoring Programme (NAMP)

Weather Monitoring Station

Laboratory

The Nagaland Pollution Control Board has a grade 'C' Laboratory attached to the office at Signal Point, Dimapur and is equipped with manpower and equipments for analysis of air and water pollution.

 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
Conductivity
Conductivity Meter
2
pH
pH Meter
3
Total Solids
Gravimetric
4
Temperature
Thermometer
5
Turbidity
Nephelometric

(B) Chemical Parameters

Sl. No.
Parameters
Method
1
Acidity
Color Indicator titration
2
Alkalinity
Color Indicator titration
3 Biochemical Oxygen Demand Three day BOD at 27 degree Celsius
4 Chloride Titrimetric (Argentometric)
5 Calcium Titrimetric (EDTA
6 Dissolved Oxygen Winkler titrimetric-azide-modification (Iodometric)
7 Hardness Total Titrimetric (EDTA)
8 Magnesium By difference (between total hardness and calcium determined titrimetrically)
9 Phosphate a. Orthophosphate-Pretreatment followed by Colorimetric (Stannous-Chloride or Vanadium Molybdate)
b. Polyphosphate - -do-
c. Total - -do-
10 Potassium Flame photometer
11 Sodium Flame photometer
12 Sulphite Titrimetric (Iodometric)
13 Sulphate Turbidimetric

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

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National Water Quality Monitoring Programme (NWMP)

Under the NWMP, the NPCB is monitoring river Dhansiri in Dimapur at 5 (five) stations i.e., full Nagarjan (1796), Purana bazar (1797), near Khatkhati gate (1798), Dillai gate (1799) and Notun Bosti (1800). The Dhansiri river is monitored regularly on a quarterly basis and the results of the analysis are sent to the Central Pollution Control Board, Delhi accordingly.

The water quality status of Dhansiri river in respect of the different parameters analysed, for the quarter April 2004 is given below:

Parameter

Station code

1796 1797 1798 1799 1800
Temperature (C) 25.7 26.2 26.8 23.7 24.9
pH 7.3 6.8 7.5 7.2 6.8
Conductivity (mS) 0.24 0.18 0.21 0.20 0.18
Dissolved Oxygen (mg/L) 5.91 5.62 5.07 5.63 4.22
BOD (mg/L) 1.40 1.68 1.13 1.69 3.09
Chloride (mg/L) 17 17 14 12 13
Hardness as CaCO3 (mg/L) 62 64 58 48 48
Calcium as CaCO3 (mg/L) 27.3 33.6 31.5 23.1 29.4
Magnesium as CaCO3 (mg/L) 8.43 7.39 6.44 6.05 4.52
Alkalinity (mg/L) 62 58 54 48 46
Total Dissolved Solids (mg/L) 120 120 110 90 100

All the parameters analysed above are within the prescribed standards.

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National Ambient Air Quality Monitoring Programme (NAMP)

Under NAMP, the NPCB has established 2 nos. of  air stations for monitoring the air quality in Dimapur. The stations are located at Bank colony (residential area) and at Hongkong market (residential area but basically a commercial centre). Two air pollutants viz., suspended particulate matter (SPM) and respirable particulate matter (RSPM) are presently being monitored. The monitoring of particulate matter is carried out for 24 hours (8 - hourly sampling) with a frequency of twice a week, to have 104 observations in a year. The datas collected are regularly sent to the CPCB on a monthly basis.

The 24 hourly averages of  SPM and RSPM for the month of May 2004 in respect of the two air stations are given below:

  Bank Colony Hongkong Market
Suspended Particulate Matter (SPM) 116 g/ m3 118 g/ m3
Respirable Particulate Matter (RSPM) 53 g/ m3 66 g/ m3

The 24 hourly averages of  SPM and RSPM for the month of May 2004 at both the stations are within the permissible limit.

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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 and has started monitoring meteorological parameters viz., temperature, humidity, rainfall, wind speed and wind direction.

The different meteorological parameters recorded in Dimapur during the month of June 2004 are given below;

Temperature (C) Rel. Humidity (%) Wind Speed (km/hr) Rainfall (mm)
Avg. Max. Min. Avg. Max. Min. Avg. Max. Min. Avg. Max. Min.
27.2 35.6 23.0 80.3 96.0 41.5 3.2 8.4 0.1 2.8 21.0 0.5

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