sampling point
Chess Above Colne

Description	CHESS ABOVE COLNE
Sampling point ID	TH-PCNR0013
Type	Freshwater – Rivers
Status	open
Location	easting northing: 506624 194687 lat lon: 51.640882, -0.460551
Area	Hertfordshire And North London
Sub-Area	L&W Herts & North London
Summary	255 samples taken between 2024 and 2000

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.

31 determinands have been measured at this site

Action taken
Alky pH 4.5
Ammonia(N)
AmoniaTotYSI
BOD ATU
Calcium - Ca
Chloride Ion
Cond @ 20C
Cond @ 25C
Copper - Cu
Cu Filtered
Hardness
Magnesium-Mg
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
Triclosan
Type of Flow
Zinc - as Zn
pH
pH in-situ

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 5 Jul 2023 to 2 Jul 2024

Notation	Determinand	Units	5 Jul 2023 09:36	2 Aug 2023 12:22	5 Sep 2023 12:46	4 Oct 2023 13:25	13 Nov 2023 12:42	7 Dec 2023 14:02	3 Jan 2024 13:19	7 Feb 2024 12:54	5 Mar 2024 12:50	2 Jul 2024 11:51
0061	pH		8.2	8.23	8.22	8.24	8.01	8.19	8.11	8.24	8.03	8.15
0076	Temperature of Water	°C	13.7	16.5	17.5	13.9	10.6	7.5	9.5	8.8	9	14.4
0077	Conductivity at 25 C	μs/cm	605	618	635	629	615	631	578	622	619	620
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	0.036	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	6.4	6.3	6.8	6.9	7.3	7.8	5.5	6.5	6.4	5.6
0117	Nitrate as N	mg/l	6.39	6.29	6.79	6.89	7.28	7.79	5.48	6.47	6.34	5.59
0118	Nitrite as N	mg/l	0.015	0.014	0.01	0.0093	0.016	0.012	0.024	0.034	0.056	0.015
0119	Ammonia un-ionised as N	mg/l	< 0.00072	< 0.00088	< 0.00094	< 0.00073	< 0.00057	< 0.00046	< 0.00053	< 0.0005	0.00061	< 0.00075
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	250	250	250	250	240	250	240	250	260	250
0180	Orthophosphate, reactive as P	mg/l	0.2	0.15	0.12	0.26	0.23	0.22	0.21	0.18	0.14	0.06
9901	Oxygen, Dissolved, % Saturation	%	96.6	99.3	100.9	99	96.9	97.8	96.7	97.8	98.8	99.8
9924	Oxygen, Dissolved as O2	mg/l	10	9.67	9.63	10.2	10.8	11.7	11	11.3	11.4	10.2

Samples from 5 Sep 2022 to 2 Jun 2023

Notation	Determinand	Units	5 Sep 2022 10:40	19 Oct 2022 09:47	2 Nov 2022 09:57	1 Dec 2022 08:56	25 Jan 2023 12:41	21 Feb 2023 12:58	3 Mar 2023 10:51	5 Apr 2023 09:56	31 May 2023 10:50	2 Jun 2023 10:14
0061	pH		8.3	8.35	8.29	8.1	8.07	8.34	8.27	8.31	8.26	8.18
0076	Temperature of Water	°C	16.8	10.9	10.3	7.3	4.5	9.6	6.7	8.5	13.1	12.7
0077	Conductivity at 25 C	μs/cm	657	657	633	670	671	631	637	632	618	612
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	7.4	8.5	8	10	8.9	7.4	8.6	7.4	6.5	6.4
0117	Nitrate as N	mg/l	7.39	8.49	7.98	9.99	8.89	7.39	8.58	7.38	6.49	6.37
0118	Nitrite as N	mg/l	0.011	0.01	0.016	0.013	0.015	0.014	0.021	0.018	0.013	0.026
0119	Ammonia un-ionised as N	mg/l	< 0.0009	< 0.00058	< 0.00056	< 0.00045	< 0.00037	< 0.00053	< 0.00043	< 0.00049	< 0.00069	< 0.00067
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	250	250	230	250	240	250	260	260	240	250
0180	Orthophosphate, reactive as P	mg/l	0.25	0.28	0.3	0.49	0.17	0.22	0.19	0.13	0.15	0.16
9901	Oxygen, Dissolved, % Saturation	%	95.7	96.6	95.1	97.7	98.2	98.7	100.6	98.7	99.7	99.5
9924	Oxygen, Dissolved as O2	mg/l	9.26	10.7	10.6	11.8	12.7	11.2	12.3	11.5	10.5	10.5

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sampling point Chess Above Colne

Determinands

Sampling results

Samples from 5 Jul 2023 to 2 Jul 2024

Samples from 5 Sep 2022 to 2 Jun 2023

sampling point
Chess Above Colne