sampling point
R.Blyth U/S Mells Near Holton

Description	RSN0469 R.BLYTH U/S MELLS NEAR HOLTON
Sampling point ID	AN-RSN0469
Type	Freshwater – Rivers
Status	open
Location	easting northing: 640413 276967 lat lon: 52.338047, 1.527667
Area	Essex Norfolk And Suffolk
Sub-Area	Norfolk & Suffolk Team Sub Area
Summary	12 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 4 Mar 2021 to 1 Dec 2021

Notation	Determinand	Units	4 Mar 2021 11:25	7 Apr 2021 13:24	5 May 2021 10:29	15 Jun 2021 09:50	15 Jul 2021 09:47	13 Aug 2021 09:37	2 Sep 2021 09:31	19 Oct 2021 13:21	16 Nov 2021 09:59	1 Dec 2021 15:23
0061	pH		7.79	7.78	7.62	7.49	7.47	7.49	7.47	7.47	7.43	7.76
0076	Temperature of Water	°C	6.3	7	8.7	16.2	15.4	15.5	14.5	14.6	10.6	8.5
0077	Conductivity at 25 C	μs/cm	933	1017	975	1212	1145	1174	1240	1070	1105	1036
0111	Ammoniacal Nitrogen as N	mg/l	0.13	0.1	0.082	0.12	0.072	0.055	0.057		0.18	0.063
0116	Nitrogen, Total Oxidised as N	mg/l	4.7	3.8	3.3	9.7	7	5.5	6.8		4.6	11
0117	Nitrate as N	mg/l	4.64	3.74	3.23	9.59	6.93	5.45	6.75		4.53	10.9
0118	Nitrite as N	mg/l	0.061	0.056	0.068	0.11	0.067	0.055	0.054		0.068	0.074
0119	Ammonia un-ionised as N	mg/l	0.00112	0.00089	0.00057	0.00108	0.00059	0.00047	0.00043		0.00094	0.0006
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	260	250	230	250	260	270	270		280	230
0172	Chloride	mg/l	70	81	86	340	120	120	140		100	87
0180	Orthophosphate, reactive as P	mg/l	0.21	0.33	0.36	1.1	0.99	0.97	1.2		0.71	0.31
0182	Silica, reactive as SiO2	mg/l	8.4	8.1	6.2	13	14	15	15		13	10
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	6.1	5.5	5.7	5.9	5.5	5.7	5.5		6	6.9
0348	Phosphorus, Total as P	mg/l	0.26	0.38	0.49	1.3	1.1	1.1	1.5		0.71	0.37
9686	Nitrogen, Total as N	mg/l	5.6	4.5	4.1	10	7.9	6.7	9.2		5.3	13
9901	Oxygen, Dissolved, % Saturation	%	85.2	118	90.7	52.5	52.8	55.1	63.7	58.4	57.8	80.7
9924	Oxygen, Dissolved as O2	mg/l	10.5	14.3	10.5	5.13	5.26	5.48	6.47	5.92	6.41	9.42

Samples from 21 Jan 2021 to 18 Feb 2021

Notation	Determinand	Units	21 Jan 2021 12:29	18 Feb 2021 12:43
0061	pH		7.88	8.06
0076	Temperature of Water	°C	6.4	7
0077	Conductivity at 25 C	μs/cm	788	721
0111	Ammoniacal Nitrogen as N	mg/l	0.075	0.12
0116	Nitrogen, Total Oxidised as N	mg/l	11	7.4
0117	Nitrate as N	mg/l	11	7.35
0118	Nitrite as N	mg/l	0.047	0.053
0119	Ammonia un-ionised as N	mg/l	0.0008	0.00176
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	240	230
0172	Chloride	mg/l	40	43
0180	Orthophosphate, reactive as P	mg/l	0.12	0.15
0182	Silica, reactive as SiO2	mg/l	6.2	5.9
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	6.9	6.2
0348	Phosphorus, Total as P	mg/l	0.21	0.17
9686	Nitrogen, Total as N	mg/l	11	7.7
9901	Oxygen, Dissolved, % Saturation	%	91.8	96
9924	Oxygen, Dissolved as O2	mg/l	11.3	11.6