sampling point
R.Witham Stapleford Bridge

Description	R.WITHAM STAPLEFORD BRIDGE
Sampling point ID	AN-WITH12
Type	Freshwater – Rivers
Status	open
Location	easting northing: 488550 357130 lat lon: 53.104016, -0.678803
Area	Lincolnshire And Northamptonshire
Sub-Area	North & South Team Sub Area
Summary	15 samples taken between 2021 and 2020

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.

13 determinands have been measured at this site

Alky pH 4.5
Ammonia(N)
BOD ATU
Cond @ 25C
N Oxidised
NH3 un-ion
Nitrate-N
Nitrite-N
O Diss %sat
Orthophospht
Oxygen Diss
Temp Water
pH

Samples from 5 Mar 2021 to 3 Dec 2021

Notation	Determinand	Units	5 Mar 2021 10:43	22 Apr 2021 08:46	5 May 2021 10:28	9 Jun 2021 12:51	12 Jul 2021 10:36	12 Aug 2021 10:55	7 Sep 2021 09:45	25 Oct 2021 09:50	8 Nov 2021 10:29	3 Dec 2021 10:20
0061	pH		8.32	8.26	8.23	8.44	7.94	7.97	7.9	8.07	8.23	8.22
0076	Temperature of Water	°C	6.6	8.9	9	20.5	17.6	17.6	17.2	10.2	7.4	3.8
0077	Conductivity at 25 C	μs/cm	929	946	992	964	838	799	1056	990	981	1014
0085	BOD : 5 Day ATU	mg/l	1.9	1.6	2.9	2.1	< 6	1.1	< 3	1.4	1.2	1.4
0111	Ammoniacal Nitrogen as N	mg/l	0.087	< 0.03	0.83	< 0.03	0.058	< 0.03	< 0.03	< 0.03	< 0.03	0.038
0116	Nitrogen, Total Oxidised as N	mg/l	13	10	10	7.4	6.8	4.7	7.2	9	8.6	9.9
0117	Nitrate as N	mg/l	12.9	9.94	9.87	7.36	6.71	4.68	7.16	8.97	8.58	9.83
0118	Nitrite as N	mg/l	0.084	0.065	0.13	0.038	0.09	0.021	0.041	0.026	0.022	0.067
0119	Ammonia un-ionised as N	mg/l	0.00124	< 0.0005	0.0141	< 0.00117	0.00161	< 0.00089	< 0.00074	< 0.00056	< 0.00045	0.00044
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	220	190	200	220	200	200	240	220	230	220
0180	Orthophosphate, reactive as P	mg/l	0.11	0.096	0.2	0.2	0.29	0.27	0.31	0.38	0.28	0.23
9901	Oxygen, Dissolved, % Saturation	%	103.2	106.4	98.3	144.1	66.4	88.2	74.8	82.1	89.5	90.3
9924	Oxygen, Dissolved as O2	mg/l	12.6	12.3	11.3	12.9	6.32	8.4	7.18	9.21	10.7	11.9

Samples from 15 Oct 2020 to 17 Feb 2021

Notation	Determinand	Units	15 Oct 2020 12:41	4 Nov 2020 10:41	9 Dec 2020 10:43	8 Jan 2021 08:58	17 Feb 2021 12:08
0061	pH		8.23	8.14	8.29	8.12	8.13
0076	Temperature of Water	°C	10.1	7.9	4.8	3.6	7.5
0077	Conductivity at 25 C	μs/cm	1138	949	899	985	848
0085	BOD : 5 Day ATU	mg/l	3.6	1.1	1.8	1.9
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	0.14	0.21	0.047
0116	Nitrogen, Total Oxidised as N	mg/l	11	10	15	15	13
0117	Nitrate as N	mg/l	11	9.97	14.9	14.9	13
0118	Nitrite as N	mg/l	0.016	0.034	0.054	0.085	0.038
0119	Ammonia un-ionised as N	mg/l	< 0.00055	< 0.00047	0.00174	0.00239	0.00071
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	210	210	200	210	200
0180	Orthophosphate, reactive as P	mg/l	0.34	0.32	0.12	0.14	0.073
9901	Oxygen, Dissolved, % Saturation	%	107.2	90.1	97.2	96.5	97.4
9924	Oxygen, Dissolved as O2	mg/l	12	10.7	12.5	12.8	11.7