sampling point
Sml R.Lee Below Windmill Lane- Sml R.Lee

Description	RSN1689 SMALL RIVER LEE BELOW WINDMILL LANE- SMALL RIVER LEE
Sampling point ID	TH-RSN1689
Type	Freshwater – Rivers
Status	open
Location	easting northing: 536765 202255 lat lon: 51.702372, -0.022267
Area	Hertfordshire And North London
Sub-Area	L&W Herts & North London
Summary	11 samples taken during 2021

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.

17 determinands have been measured at this site

Alky pH 4.5
Ammonia(N)
C - Org Filt
Chloride Ion
Cond @ 25C
N Oxidised
NH3 un-ion
Nitrate-N
Nitrite-N
Nitrogen - N
O Diss %sat
Orthophospht
Oxygen Diss
Phosphorus-P
SiO2 Rv
Temp Water
pH

Samples from 10 Feb 2021 to 2 Dec 2021

Notation	Determinand	Units	10 Feb 2021 10:14	5 Mar 2021 11:32	20 Apr 2021 12:27	24 May 2021 12:56	16 Jun 2021 15:19	2 Jul 2021 10:09	26 Aug 2021 12:02	28 Oct 2021 12:47	16 Nov 2021 10:00	2 Dec 2021 11:48
0061	pH		8.26	8.16	7.96	8.36	7.82	7.69	7.72	7.87	8.22	8.07
0076	Temperature of Water	°C	2.7	6	11.2	11.5	20.8	15.8	16.3	12.8	9.4	5.2
0077	Conductivity at 25 C	μs/cm	628	681	843	481	737	771	733	676	761	874
0111	Ammoniacal Nitrogen as N	mg/l	0.11	0.067	0.1	0.084	0.46	0.19	0.31	0.14	0.11	0.13
0116	Nitrogen, Total Oxidised as N	mg/l	2.4	2.3	3.1	2.3	1.6	1.7	2.1	2.3	3.3	3.6
0117	Nitrate as N	mg/l	2.39	2.28	3.05	2.27	1.44	1.63	2.05	2.27	3.26	3.55
0118	Nitrite as N	mg/l	0.015	0.016	0.055	0.035	0.16	0.069	0.052	0.028	0.039	0.049
0119	Ammonia un-ionised as N	mg/l	0.00117	0.00091	0.00182	0.00171	0.0123	0.00263	0.00476	0.00234	0.00192	0.00167
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	150	190	210	120	210	220	220	210	240	230
0172	Chloride	mg/l	54	54	78	34	61	60	59	50	54	90
0180	Orthophosphate, reactive as P	mg/l	0.15	0.15	0.22	0.16	0.43	0.31	0.43	0.25	0.26	0.24
0182	Silica, reactive as SiO2	mg/l	13	11	3.1	9.5	9	12	13	15	15	14
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	11	9.1	7.2	6.4	7.9	6.9	6.7	7.7	5.8	5.8
0348	Phosphorus, Total as P	mg/l	0.18	0.2	0.27	0.38	0.52	0.36	0.57	0.28	0.29	0.27
9686	Nitrogen, Total as N	mg/l	3.4	3	3.9	3.9	3.1	2.5	3.1	3.3	3.8	4.2
9901	Oxygen, Dissolved, % Saturation	%	95	99.5	116.5	97	73.5	72.7	63.6	73.5	87	75.2
9924	Oxygen, Dissolved as O2	mg/l	12.9	12.4	12.8	10.5	6.56	7.18	6.22	7.76	9.94	9.53

Sample on 27 Jan 2021

Notation	Determinand	Units	27 Jan 2021 11:20
0061	pH		7.9
0076	Temperature of Water	°C	5.7
0077	Conductivity at 25 C	μs/cm	590
0111	Ammoniacal Nitrogen as N	mg/l	0.073
0116	Nitrogen, Total Oxidised as N	mg/l	1.9
0117	Nitrate as N	mg/l	1.89
0118	Nitrite as N	mg/l	0.011
0119	Ammonia un-ionised as N	mg/l	0.00077
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	130
0172	Chloride	mg/l	66
0180	Orthophosphate, reactive as P	mg/l	0.12
0182	Silica, reactive as SiO2	mg/l	11
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	13
0348	Phosphorus, Total as P	mg/l	0.18
9686	Nitrogen, Total as N	mg/l	2.7
9901	Oxygen, Dissolved, % Saturation	%	95
9924	Oxygen, Dissolved as O2	mg/l	11.9