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sampling point
Silk Stream At Silk Bridge, A5, Hendon

Description SILK STREAM AT SILK BRIDGE, A5, HENDON
Sampling point ID TH-PBRR0094
Type Freshwater – Rivers
Status open
Location easting northing: 521783 188345
lat lon: 51.580812, -0.243791
Area Hertfordshire And North London
Sub-Area L&W Herts & North London
Summary 256 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.

27 determinands have been measured at this site
  • 4-nonPhenol
  • Action taken
  • Alky pH 4.5
  • Ammonia(N)
  • B-[a]-pyrene
  • B-[b]-fluora
  • B-[ghi]-pery
  • B-[k]-fluora
  • BOD ATU
  • Chloride Ion
  • Cond @ 25C
  • Fluoranthene
  • Ind123pyrene
  • N Oxidised
  • NH3 un-ion
  • Nitrate-N
  • Nitrite-N
  • O Diss %sat
  • Orthophospht
  • Oxygen Diss
  • SI-GQA
  • Temp Water
  • Triclosan
  • Type of Flow
  • pH
  • pH in-situ
  • ptOctylPheno

Sampling results

Displaying the twenty most recent samples. You can see all 256 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).

Samples from 8 Sep 2023 to 17 Jun 2024

NotationDeterminandUnits 8 Sep
2023
12:33
16 Oct
2023
14:51
20 Nov
2023
11:48
12 Dec
2023
15:04
18 Jan
2024
10:28
20 Feb
2024
11:56
18 Mar
2024
10:06
15 Apr
2024
11:21
14 May
2024
11:53
17 Jun
2024
14:10
0061pH7.677.927.877.938.218.077.897.927.838.08
0076Temperature of Water°C19.811.810.99.11.69.510.911.214.816.5
0077Conductivity at 25 Cμs/cm982942818593998791801824667908
0085BOD : 5 Day ATUmg/l< 31.68> 5.81.4
0111Ammoniacal Nitrogen as Nmg/l0.370.370.120.0730.740.120.0980.450.570.34
0116Nitrogen, Total Oxidised as Nmg/l3.742.41.93.82.62.23.12.63
0117Nitrate as Nmg/l3.513.92.351.873.722.572.162.992.422.77
0118Nitrite as Nmg/l0.190.10.0480.0280.0840.0350.0360.110.180.23
0119Ammonia un-ionised as Nmg/l0.006560.006430.001740.001060.007270.002110.001490.007480.01010.00996
0162Alkalinity to pH 4.5 as CaCO3mg/l270230210140270200200220170160
0180Orthophosphate, reactive as Pmg/l0.680.380.240.130.40.170.20.340.310.53
9901Oxygen, Dissolved, % Saturation%3874.778.987.877.290.388.784.867.290.7
9924Oxygen, Dissolved as O2mg/l3.468.078.710.110.810.39.789.296.798.84

Samples from 21 Nov 2022 to 1 Aug 2023

NotationDeterminandUnits21 Nov
2022
12:38
2 Dec
2022
13:21
23 Jan
2023
14:22
21 Feb
2023
15:10
3 Mar
2023
15:02
31 May
2023
10:45
23 Jun
2023
09:56
27 Jun
2023
12:28
17 Jul
2023
13:04
1 Aug
2023
13:09
0061pH7.87.987.977.897.997.717.78.027.927.99
0076Temperature of Water°C11.194.7107.2131817.517.216.5
0077Conductivity at 25 Cμs/cm8589529771061108110749651001887863
0085BOD : 5 Day ATUmg/l< 7
0111Ammoniacal Nitrogen as Nmg/l0.280.220.510.890.550.90.290.240.160.06
0116Nitrogen, Total Oxidised as Nmg/l3.94.23.84.34.72.63.33.73.55
0117Nitrate as Nmg/l3.794.073.724.134.592.293.033.473.284.88
0118Nitrite as Nmg/l0.110.130.0790.170.110.310.270.230.220.12
0119Ammonia un-ionised as Nmg/l0.003520.003560.005890.01270.007990.01060.004820.007560.004120.00172
0162Alkalinity to pH 4.5 as CaCO3mg/l190230230270270280260260220230
0180Orthophosphate, reactive as Pmg/l0.250.350.320.590.540.740.680.640.530.48
9901Oxygen, Dissolved, % Saturation%76.974.782.270.784.74528.168.360.183.4
9924Oxygen, Dissolved as O2mg/l8.448.6210.67.9710.24.732.656.525.778.12