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sampling point
Ash At Bridge North Of Widford

Description ASH AT BRIDGE NORTH OF WIDFORD
Sampling point ID TH-PLER0004
Type Freshwater – Rivers
Status open
Location easting northing: 542420 216910
lat lon: 51.832645, 0.065514
Area Hertfordshire And North London
Sub-Area L&W Herts & North London
Summary 255 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.

30 determinands have been measured at this site
  • Action taken
  • Alky pH 4.5
  • Ammonia(N)
  • BOD ATU
  • Calcium - Ca
  • Chloride Ion
  • Cond @ 20C
  • Cond @ 25C
  • Copper - Cu
  • Cu Filtered
  • Hardness
  • Magnesium-Mg
  • N Oxidised
  • NH3 un-ion
  • NO FLOW/SAMP
  • 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 255 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).

Samples from 2 Aug 2023 to 2 Jul 2024

NotationDeterminandUnits 2 Aug
2023
11:02
7 Sep
2023
09:13
6 Oct
2023
11:06
8 Nov
2023
10:05
1 Dec
2023
08:41
3 Jan
2024
13:28
1 Feb
2024
08:58
5 Mar
2024
10:38
4 Jun
2024
11:15
2 Jul
2024
09:01
0061pH7.747.687.567.667.748.097.787.737.737.75
0076Temperature of Water°C13.91412.79.54.78.58.28.313.712.3
0077Conductivity at 25 Cμs/cm720729725744389652763767746739
0111Ammoniacal Nitrogen as Nmg/l0.0370.033< 0.03< 0.030.0350.0470.0990.140.0840.05
0116Nitrogen, Total Oxidised as Nmg/l76.96.88.29.7108.88.48.38
0117Nitrate as Nmg/l6.986.886.788.199.699.998.788.388.287.98
0118Nitrite as Nmg/l0.0220.020.020.0120.0110.0120.0160.0190.0190.019
0119Ammonia un-ionised as Nmg/l0.00050.00039< 0.00025< 0.000240.000240.000770.000960.001220.001090.00061
0162Alkalinity to pH 4.5 as CaCO3mg/l270280280290290250290280290280
0180Orthophosphate, reactive as Pmg/l0.0380.020.0260.0390.0390.0740.0410.0620.0260.013
9901Oxygen, Dissolved, % Saturation%90.485.89081.982.693.388.492.195.990.7
9924Oxygen, Dissolved as O2mg/l9.318.829.529.3410.610.910.410.89.929.69

Samples from 17 Oct 2022 to 5 Jul 2023

NotationDeterminandUnits17 Oct
2022
10:56
2 Nov
2022
12:57
2 Dec
2022
13:50
25 Jan
2023
15:46
22 Feb
2023
11:08
1 Mar
2023
10:56
21 Apr
2023
13:40
3 May
2023
12:41
12 Jun
2023
11:06
5 Jul
2023
08:50
0061pH7.647.667.767.827.867.797.837.657.55
0076Temperature of Water°C11.19.36.89.48.210.110.614.112.5
0077Conductivity at 25 Cμs/cm728760772732745764747740565
0111Ammoniacal Nitrogen as Nmg/l< 0.030.0310.058< 0.030.038< 0.03< 0.030.0390.036
0116Nitrogen, Total Oxidised as Nmg/l6.67.5988.28.18.28.25.8
0117Nitrate as Nmg/l6.587.498.997.998.198.098.188.175.77
0118Nitrite as Nmg/l0.0220.0110.00610.00940.0110.010.0190.0260.032
0119Ammonia un-ionised as Nmg/l< 0.000260.000250.00048< 0.000350.00044< 0.00034< 0.000390.000430.00028
0162Alkalinity to pH 4.5 as CaCO3mg/l280290280280300290280280210
0180Orthophosphate, reactive as Pmg/l0.0250.030.0360.0110.0110.013< 0.010.0140.14
7668No flow /No sample0
9901Oxygen, Dissolved, % Saturation%80.887.588.89998.1108.5114.793.579.2
9924Oxygen, Dissolved as O2mg/l8.871010.811.311.512.212.79.598.42