sampling point
Parndon Brook Above Todd Brook
| Description | PARNDON BROOK ABOVE TODD BROOK |
|---|---|
| Sampling point ID | TH-PLER0306 |
| Type | Freshwater – Unspecified |
| Status | open |
| Location |
easting northing: 543600 209000 lat lon: 51.761272, 0.079354 |
| Area | Hertfordshire And North London |
| Sub-Area | L&W Herts & North London |
| Summary | 25 samples taken between 2023 and 2013 |
Determinands
Determinands identify a property which can be measured on a sample or the sampling environment, together with the units in which the result of that measurement will be expressed.
15 determinands have been measured at this site
- Alky pH 4.5
- Ammonia(N)
- BOD ATU
- Chloride Ion
- Cond @ 25C
- N Oxidised
- NH3 un-ion
- Nitrate-N
- Nitrite-N
- O Diss %sat
- Orthophospht
- Oxygen Diss
- Temp Water
- TurbidityNTU
- pH
Sampling results
Displaying the twenty most recent samples. You can see all 25 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).
Samples from 31 May 2022 to 6 Mar 2023
| Notation | Determinand | Units | 31 May 2022 13:34 | 20 Jun 2022 11:54 | 18 Jul 2022 11:28 | 31 Aug 2022 13:03 | 26 Oct 2022 11:45 | 14 Nov 2022 14:13 | 24 Nov 2022 13:29 | 25 Jan 2023 13:04 | 24 Feb 2023 12:03 | 6 Mar 2023 15:48 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0061 | pH | 8.16 | 8 | 7.97 | 7.95 | 7.83 | 8.73 | 8.09 | 8.07 | 8.12 | 8.2 | |
| 0076 | Temperature of Water | °C | 13.4 | 13.8 | 17.2 | 16.4 | 14.5 | 11.9 | 10.3 | 4.6 | 6.5 | 6.8 |
| 0077 | Conductivity at 25 C | μs/cm | 659 | 1273 | 1708 | 1314 | 946 | 958 | 733 | 967 | 1077 | 1235 |
| 0111 | Ammoniacal Nitrogen as N | mg/l | < 0.03 | 0.08 | 0.039 | 0.54 | 0.6 | < 0.03 | 0.057 | 0.25 | 0.16 | 0.054 |
| 0116 | Nitrogen, Total Oxidised as N | mg/l | 10 | 38 | 78 | 19 | 12 | 10 | 5.4 | 7.5 | 8.4 | |
| 0117 | Nitrate as N | mg/l | 9.9 | 37.9 | 77.9 | 18.8 | 11.9 | 9.96 | 5.32 | 7.41 | 8.34 | |
| 0118 | Nitrite as N | mg/l | 0.1 | 0.12 | 0.1 | 0.25 | 0.16 | 0.078 | 0.041 | 0.077 | 0.087 | 0.059 |
| 0119 | Ammonia un-ionised as N | mg/l | < 0.0007 | 0.00193 | 0.00112 | 0.014 | 0.0104 | < 0.00063 | 0.00106 | 0.00307 | 0.00226 | 0.00078 |
| 0162 | Alkalinity to pH 4.5 as CaCO3 | mg/l | 150 | 250 | 250 | 270 | 220 | 260 | 200 | 260 | 280 | 280 |
| 0180 | Orthophosphate, reactive as P | mg/l | 0.65 | 2 | 3.5 | 1.9 | 0.6 | 0.52 | 0.24 | 0.31 | 0.56 | 0.56 |
| 9901 | Oxygen, Dissolved, % Saturation | % | 94.4 | 82.2 | 84.4 | 75.2 | 74.9 | 86.5 | 91.5 | 92.4 | 102.9 | 107.9 |
| 9924 | Oxygen, Dissolved as O2 | mg/l | 9.83 | 8.49 | 8.1 | 7.34 | 7.62 | 9.32 | 10.2 | 11.9 | 12.6 | 13.1 |
Samples from 2 Jul 2021 to 27 Apr 2022
| Notation | Determinand | Units | 2 Jul 2021 11:16 | 12 Aug 2021 10:29 | 21 Sep 2021 14:11 | 22 Oct 2021 09:11 | 22 Nov 2021 10:58 | 2 Dec 2021 12:25 | 5 Jan 2022 12:55 | 16 Feb 2022 09:52 | 3 Mar 2022 13:53 | 27 Apr 2022 14:31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0061 | pH | 7.82 | 7.81 | 8.05 | 8.07 | 8.18 | 7.84 | 8.14 | 7.97 | 8.1 | 8.06 | |
| 0076 | Temperature of Water | °C | 14.8 | 16 | 14.9 | 10.7 | 7.9 | 6.2 | 6.3 | 8.4 | 8.3 | 9.7 |
| 0077 | Conductivity at 25 C | μs/cm | 1289 | 1312 | 1046 | 715 | 1096 | 1163 | 887 | 587 | 707 | 1504 |
| 0111 | Ammoniacal Nitrogen as N | mg/l | 0.084 | 0.055 | 0.039 | 0.048 | < 0.03 | 0.16 | 0.083 | 0.081 | 0.044 | 0.79 |
| 0116 | Nitrogen, Total Oxidised as N | mg/l | 55 | 44 | 16 | 11 | 7.3 | 17 | 4.5 | 7.9 | 8 | 50 |
| 0117 | Nitrate as N | mg/l | 54.9 | 43.9 | 16 | 11 | 7.24 | 16.8 | 4.46 | 7.87 | 7.97 | 49.8 |
| 0118 | Nitrite as N | mg/l | 0.14 | 0.11 | 0.045 | 0.03 | 0.061 | 0.16 | 0.041 | 0.035 | 0.032 | 0.21 |
| 0119 | Ammonia un-ionised as N | mg/l | 0.00145 | 0.00101 | 0.00102 | 0.00092 | < 0.00047 | 0.00153 | 0.00115 | 0.00123 | 0.00071 | 0.0141 |
| 0162 | Alkalinity to pH 4.5 as CaCO3 | mg/l | 240 | 240 | 260 | 220 | 300 | 240 | 280 | 170 | 210 | 260 |
| 0180 | Orthophosphate, reactive as P | mg/l | 2.5 | 2.8 | 1.6 | 0.35 | 0.82 | 1.5 | 0.29 | 0.17 | 0.23 | 4.2 |
| 9901 | Oxygen, Dissolved, % Saturation | % | 86.6 | 87.2 | 85 | 96.5 | 75.5 | 81.6 | 96.3 | 98.6 | 97.7 | 91 |
| 9924 | Oxygen, Dissolved as O2 | mg/l | 8.75 | 8.58 | 8.57 | 10.7 | 8.95 | 10.1 | 11.9 | 11.5 | 11.5 | 10.3 |