NRA
Exeter Regional Laboratory |
Automatic
Sample Analysis Report Production |
Sampling Point : RPL/02B |
Date/Time Report Last Run : 08 March 1992 04:20 |
Date/Time Taken: 25th February 1992
16:00hrs |
Pollution Incidents in Catchment 02b |
| Address: Pond at Offwell Woodland & Wildlife Trust
Reserve. (The Woodland Education Centre) |
Laboratory Reference: E54281 |
| Samplers Comments: (Mr AF Sweetapple) - "Slight
froth" |
| |
Det. Code |
Description |
Result |
Units/Measure |
61 |
pH |
7.5 |
pH |
76 |
Temperature |
No Result |
|
81 |
Oxygen
Dissolved % Saturation |
107 |
% |
82 |
Oxygen
Dissolved |
No Result |
|
85 |
Bod Atu |
1.2 |
mg/l |
111 |
Ammonia expressed as Nitrogen |
0.03 |
mg/l N |
116 |
Nitrogen Total Oxidised expressed as Nitrate AND Nitrite |
1.4 |
mg/l N |
117 |
Nitrate |
1.39 |
mg/l |
118 |
Nitrite |
0.01 |
mg/l |
135 |
Suspended Solids
105c |
<2 |
mg/l |
143 |
Solids
Non-Volatile 500c |
No Result |
|
172 |
Chloride Ion |
19 |
mg/l |
180 |
Ortho-Phosphate |
0.02 |
mg/l |
1181 |
Weather Present - Temperature |
|
Misc. |
1183 |
Weather Present - Precipitation |
|
Misc. |
3106 |
Analysis By Mass-Spectrometer |
Report Filed - Nothing Significant Found. |
Misc. |
3267 |
Type of Flow As Description |
|
Misc. |
| |
INTERPRETATION
OF ANALYTICAL RESULTS |
Dissolved Oxygen
D.O. |
Shows
the concentration of oxygen dissolved in the water. Generally the more oxygen present
the less polluted the water. |
Dissolved Oxygen
Percent Saturation D.O.% |
Shows
the concentration of Oxygen present as a percentage of the saturation level at that
particular temperature. |
Ammonia NH3 |
This
generally arises as a result of the decomposition of organic nitrogenous waste and is
usually found in substantial quantities in crude sewage and farm wastes. |
Nitrate NO3 |
Nitrates can
originate from compound fertilizers application to farmland or the oxidation of ammonia by
bacteria, the process which occurs at a sewage treatment works. |
pH |
pH is a measure of the
degree of acidity or alkalinity of the water. A pH value of 7 is neutral with values
less than 7 being acidic while values in excess of 7 are alkaline. |
Biochemical
Oxygen Demand B.O.D. |
This shows the amount
of oxygen that is used by the bacteria in digesting any organic pollutants present in
the sample. Expected levels of B.O.D. are: Clean River
1-3 mg/l
Treated Sewage 20 mg/l
Crude Sewage 200-300 mg/l
Farm Yard Runoff 1,500-2,000 mg/l
Silage Liquor 60,000 mg/l |
Suspended Solids
S.S. |
Shows
the amount of solids that are present in the sample, measured in mg/l. |