sampling point
Stort At Spellbrook Weir
| Description | STORT AT SPELLBROOK WEIR |
|---|---|
| Sampling point ID | TH-PLER0152 |
| Type | Freshwater – Rivers |
| Status | open |
| Location |
easting northing: 549030 217559 lat lon: 51.836753, 0.16165 |
| Area | Hertfordshire And North London |
| Sub-Area | L&W Herts & North London |
| Summary | 221 samples taken between 2024 and 2000 |
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.
35 determinands have been measured at this site
- Action taken
- Alky pH 4.5
- Ammonia(N)
- AmoniaTotYSI
- BOD ATU
- Bentazone
- CHLOR A
- CHLOROPHYLL
- Calcium - Ca
- Chloride Ion
- Cond @ 20C
- Cond @ 25C
- Copper - Cu
- Cu Filtered
- Cypermethrin
- Hardness
- Magnesium-Mg
- Mecoprop
- N Oxidised
- NH3 un-ion
- Nitrate-N
- Nitrite-N
- O Diss %sat
- Oil & Grs Vs
- Orthophospht
- Oxygen Diss
- Phenol Odour
- SI-EC-F
- SI-GQA
- Sld Sus@105C
- Temp Water
- Type of Flow
- Zinc - as Zn
- pH
- pH in-situ
Sampling results
Displaying the twenty most recent samples. You can see all 221 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).
Samples from 24 Aug 2022 to 11 Jul 2024
| Notation | Determinand | Units | 24 Aug 2022 11:13 | 26 Sep 2022 12:13 | 27 Oct 2022 10:05 | 25 Nov 2022 13:16 | 13 Dec 2022 13:48 | 25 Jan 2023 14:00 | 22 Feb 2023 14:03 | 7 Mar 2023 12:26 | 12 Jun 2024 12:34 | 11 Jul 2024 11:37 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0061 | pH | 7.54 | 7.94 | 7.68 | 7.82 | 7.67 | 7.89 | 7.96 | 7.85 | 7.94 | 7.78 | |
| 0076 | Temperature of Water | °C | 20.2 | 14.3 | 13.7 | 10.1 | 3.5 | 5.3 | 10.2 | 7.9 | 14 | 16.7 |
| 0077 | Conductivity at 25 C | μs/cm | 928 | 1072 | 788 | 866 | 1347 | 879 | 973 | 1116 | 924 | 675 |
| 0111 | Ammoniacal Nitrogen as N | mg/l | 0.14 | 0.09 | 0.057 | < 0.03 | 0.044 | 0.067 | < 0.03 | 0.098 | 0.091 | 0.15 |
| 0116 | Nitrogen, Total Oxidised as N | mg/l | 15 | 22 | 12 | 14 | 15 | 15 | 14 | 17 | 14 | 8.1 |
| 0117 | Nitrate as N | mg/l | 14.8 | 22 | 12 | 14 | 15 | 15 | 14 | 17 | 13.9 | 8.03 |
| 0118 | Nitrite as N | mg/l | 0.2 | 0.022 | 0.046 | 0.036 | 0.024 | 0.036 | 0.015 | 0.043 | 0.085 | 0.066 |
| 0119 | Ammonia un-ionised as N | mg/l | 0.0019 | 0.00196 | 0.00066 | < 0.00037 | 0.00023 | 0.00067 | < 0.00051 | 0.00109 | 0.00194 | 0.00272 |
| 0162 | Alkalinity to pH 4.5 as CaCO3 | mg/l | 220 | 220 | 180 | 230 | 250 | 250 | 270 | 260 | 250 | 190 |
| 0180 | Orthophosphate, reactive as P | mg/l | 0.56 | 0.53 | 0.31 | 0.19 | 0.32 | 0.25 | 0.31 | 0.4 | 0.39 | 0.33 |
| 9901 | Oxygen, Dissolved, % Saturation | % | 57.5 | 83.6 | 65.1 | 94.4 | 79.9 | 91 | 92.1 | 94.7 | 91.6 | 81.3 |
| 9924 | Oxygen, Dissolved as O2 | mg/l | 5.19 | 8.54 | 6.74 | 10.6 | 10.6 | 11.5 | 10.3 | 11.2 | 9.42 | 7.89 |
Samples from 14 Oct 2021 to 29 Jul 2022
| Notation | Determinand | Units | 14 Oct 2021 11:22 | 2 Nov 2021 10:20 | 2 Dec 2021 10:38 | 24 Jan 2022 11:59 | 17 Feb 2022 13:17 | 22 Mar 2022 12:27 | 19 Apr 2022 12:33 | 30 May 2022 17:39 | 20 Jun 2022 10:54 | 29 Jul 2022 10:56 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0061 | pH | 7.77 | 7.77 | 7.79 | 7.79 | 8.02 | 7.93 | 8.37 | 7.91 | 7.92 | 7.95 | |
| 0076 | Temperature of Water | °C | 13.1 | 10.1 | 5.7 | 6.6 | 8.6 | 10.5 | 13.4 | 14.9 | 17 | 18 |
| 0077 | Conductivity at 25 C | μs/cm | 973 | 855 | 1041 | 950 | 752 | 967 | 962 | 989 | 1106 | 1027 |
| 0111 | Ammoniacal Nitrogen as N | mg/l | 0.039 | 0.032 | 0.046 | 0.045 | 0.062 | < 0.03 | < 0.03 | 0.15 | 0.05 | |
| 0116 | Nitrogen, Total Oxidised as N | mg/l | 15 | 12 | 15 | 14 | 13 | 16 | 18 | 17 | 16 | |
| 0117 | Nitrate as N | mg/l | 15 | 12 | 15 | 14 | 13 | 16 | 18 | 16.9 | 15.9 | |
| 0118 | Nitrite as N | mg/l | 0.027 | 0.024 | 0.023 | 0.023 | 0.033 | 0.02 | 0.025 | 0.062 | 0.068 | |
| 0119 | Ammonia un-ionised as N | mg/l | 0.00053 | 0.00035 | 0.00038 | 0.0004 | 0.00102 | < 0.00048 | < 0.0007 | 0.00381 | 0.00146 | |
| 0162 | Alkalinity to pH 4.5 as CaCO3 | mg/l | 250 | 230 | 240 | 270 | 230 | 260 | 230 | 220 | 240 | |
| 0180 | Orthophosphate, reactive as P | mg/l | 0.44 | 0.31 | 0.32 | 0.38 | 0.22 | 0.33 | 0.31 | 0.49 | 0.55 | |
| 9901 | Oxygen, Dissolved, % Saturation | % | 79.1 | 75.2 | 78.6 | 79.7 | 93.6 | 100.9 | 137.9 | 100.2 | 87.2 | 91.8 |
| 9924 | Oxygen, Dissolved as O2 | mg/l | 8.3 | 8.45 | 9.85 | 9.76 | 10.9 | 11.2 | 14.4 | 10.1 | 8.41 | 8.67 |