sampling point
Roman River Walcotts Bridge

Description	ROMAN RIVER WALCOTTS BRIDGE
Sampling point ID	AN-RR0186
Type	Freshwater – Rivers
Status	open
Location	easting northing: 588700 225440 lat lon: 51.895547, 0.741094
Area	Essex Norfolk And Suffolk
Sub-Area	Essex Team Sub Area
Summary	19 samples taken between 2021 and 2019

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.

14 determinands have been measured at this site

Alky pH 4.5
Ammonia(N)
BOD ATU
Cond @ 25C
N Oxidised
NH3 un-ion
NO FLOW/SAMP
Nitrate-N
Nitrite-N
O Diss %sat
Orthophospht
Oxygen Diss
Temp Water
pH

Samples from 5 Feb 2020 to 3 Dec 2021

Notation	Determinand	Units	5 Feb 2020 11:29	2 Mar 2020 09:53	5 May 2021 12:00	8 Jun 2021 08:44	7 Jul 2021 14:07	5 Aug 2021 08:08	2 Sep 2021 12:30	7 Oct 2021 09:58	4 Nov 2021 14:13	3 Dec 2021 08:18
0061	pH		7.95	7.89	8.11	8.25	8.07	8.06	8.09	7.98	8.01	8.12
0076	Temperature of Water	°C	6.8	6.2	8.9	12.5	14.8	12.7	14.1	12.3	9.2	4.9
0077	Conductivity at 25 C	μs/cm	882	740	897	1000	916	905	895	882	919	919
0085	BOD : 5 Day ATU	mg/l	1.2	< 1
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	0.14	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	7.9	11	7.8	7.2	6.6	7.5	7.6	8	6.6	6.4
0117	Nitrate as N	mg/l	7.89	11	7.79	7.18	6.59	7.49	7.59	7.99	6.59	6.39
0118	Nitrite as N	mg/l	0.011	0.013	0.013	0.018	0.012	0.012	0.0097	0.011	0.0073	0.0086
0119	Ammonia un-ionised as N	mg/l	< 0.00039	< 0.00032	0.00236	< 0.00066	< 0.00078	< 0.00067	< 0.00074	< 0.00062	< 0.00052	< 0.00038
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	300	250	290	290	300	280	290	280	310	320
0180	Orthophosphate, reactive as P	mg/l	0.056	0.1	0.091	0.051	0.12	0.056	0.045	0.094	0.044	0.043
9901	Oxygen, Dissolved, % Saturation	%	97.4	92.8	93.6	93	90.4	86.2	91	89.1	82.6	80.5
9924	Oxygen, Dissolved as O2	mg/l	11.9	11.5	10.8	9.89	9.13	9.12	9.33	9.52	9.49	10.3

Samples from 13 May 2019 to 6 Jan 2020

Notation	Determinand	Units	13 May 2019 09:35	10 Jun 2019 09:53	12 Jul 2019 14:54	22 Aug 2019 12:34	5 Sep 2019 08:51	7 Oct 2019 08:54	12 Nov 2019 14:32	4 Dec 2019 11:35	6 Jan 2020 15:04
0061	pH		8.25	8.09	8.2			8.04	8.09	8.13	7.96
0076	Temperature of Water	°C	8.5	11.6	17			11.4	7.5	6	7.3
0077	Conductivity at 25 C	μs/cm	923	731	907			870	940	953	899
0085	BOD : 5 Day ATU	mg/l	< 1	6.76	< 1			1.2	< 1	1.2	< 1
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	0.193	< 0.03			< 0.03	< 0.03	< 0.03	0.037
0116	Nitrogen, Total Oxidised as N	mg/l	5.91	4.83	6.7			7.4	6.69	7.4	9
0117	Nitrate as N	mg/l	5.9	4.8	6.69			7.39	6.68	7.39	8.99
0118	Nitrite as N	mg/l	0.0074	0.0291	0.011			0.011	0.0116	0.0076	0.012
0119	Ammonia un-ionised as N	mg/l	< 0.00049	0.00396	< 0.00091			< 0.00061	< 0.00046	< 0.00041	0.00051
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	293	216	280			260	302	300	290
0180	Orthophosphate, reactive as P	mg/l	0.043	0.228	0.061			0.21	0.081	0.034	0.067
7668	No flow /No sample					0	0
9901	Oxygen, Dissolved, % Saturation	%	96.8	80.2	93.5			92.3	89	91.6	88.7
9924	Oxygen, Dissolved as O2	mg/l	11.3	8.7	9.01			10.1	10.7	11.4	10.7