sampling point
Loxford Water Alder Walk - 7 Kings Water

Description	RSN0097 LOXFORD WATER ALDER WALK - SEVEN KINGS WATER
Sampling point ID	TH-RSN0097
Type	Freshwater – Rivers
Status	open
Location	easting northing: 544680 185175 lat lon: 51.546921, 0.085143
Area	Hertfordshire And North London
Sub-Area	L&W Herts & North London
Summary	17 samples taken between 2022 and 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 3 Nov 2021 to 4 Nov 2022

Notation	Determinand	Units	3 Nov 2021 10:49	15 Dec 2021 12:41	14 Feb 2022 12:55	28 Mar 2022 14:04	25 Apr 2022 10:46	16 May 2022 11:01	27 Jul 2022 11:41	31 Aug 2022 10:43	29 Sep 2022 10:39	4 Nov 2022 12:41
0061	pH		7.85	7.64	7.81	9.24	8.35	8.72	8.93	8.51	8.13	7.87
0076	Temperature of Water	°C	8.7	9.6	8	13.3	12.2	17.6	20.3	18.1	11.8	12.3
0077	Conductivity at 25 C	μs/cm	588	685	652	750	783	721	807	677	715	577
0111	Ammoniacal Nitrogen as N	mg/l	0.26	0.28	0.45	< 0.03	0.35	0.3	< 0.03	0.048	0.092	0.19
0116	Nitrogen, Total Oxidised as N	mg/l	3.5	4.5	3.6	3.1	1.7	1.1	< 0.2		0.84	3.5
0117	Nitrate as N	mg/l	3.38	4.4	3.53	3.05	1.61	0.9	0.13		0.766	3.43
0118	Nitrite as N	mg/l	0.12	0.1	0.074	0.055	0.09	0.2	0.07	0.088	0.074	0.075
0119	Ammonia un-ionised as N	mg/l	0.00307	0.00219	0.0046	< 0.0007	0.0075	0.00951	< 0.00116	0.00158	0.00191	0.00306
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	150	160	120	180	180	170	220	170	170	130
0172	Chloride	mg/l	45	55	68	68	71	64	86	61	67	45
0180	Orthophosphate, reactive as P	mg/l	0.26	0.25	0.19	0.19	0.23	0.54	1.2	0.5	0.26	0.31
0182	Silica, reactive as SiO2	mg/l	9.8	11	8.9	4.1	0.37	6	0.57	1.6	2.8	7.8
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	7.4	7	6.7	7.8	7.8	8	8.9	6.4	5.7	5.7
0348	Phosphorus, Total as P	mg/l	0.3	0.3	0.32	0.24	0.32	0.56	1.5	0.56	0.31	0.35
9686	Nitrogen, Total as N	mg/l	4.5	5.8	4.9	3.9	2.9	2.3	3.3	1.8	1.6	4.1
9901	Oxygen, Dissolved, % Saturation	%	81.7	74.2	87.7	210.3	85.8	164	177.6	129.7	96.5	87.7
9924	Oxygen, Dissolved as O2	mg/l	9.49	8.44	10.4	21.9	9.18	15.6	16	12.2	10.4	9.36

Samples from 24 Mar 2021 to 7 Oct 2021

Notation	Determinand	Units	24 Mar 2021 13:41	19 Apr 2021 11:22	27 May 2021 12:29	17 Jun 2021 13:53	26 Jul 2021 14:26	31 Aug 2021 12:22	7 Oct 2021 11:51
0061	pH		8.72	9.01	8.46	7.66	8.67	8.57	7.82
0076	Temperature of Water	°C	11.3	12.1	17.4	21.3	21.6	17.1	14.3
0077	Conductivity at 25 C	μs/cm	781	695	747	637	583	647	530
0111	Ammoniacal Nitrogen as N	mg/l	0.12	< 0.03	0.19	0.9	0.096	0.066	0.18
0116	Nitrogen, Total Oxidised as N	mg/l	4.4	2.8	4.5	1.6	0.99	1.4	3.6
0117	Nitrate as N	mg/l	4.3	2.74	4.35	1.43	0.944	1.29	3.52
0118	Nitrite as N	mg/l	0.097	0.06	0.15	0.17	0.046	0.11	0.078
0119	Ammonia un-ionised as N	mg/l	0.00241	< 0.00064	0.00594	0.0174	0.00406	0.00202	0.00299
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	170	120	150	160	150	160	130
0172	Chloride	mg/l	75	82	69	59	53	56	42
0180	Orthophosphate, reactive as P	mg/l	0.18	0.033	0.19	0.51	0.35	0.35	0.26
0182	Silica, reactive as SiO2	mg/l	7.6	< 0.2	6	7.1	3.5	5	7.3
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	9.2	9	7.6	8	6.5	6.5	8
0348	Phosphorus, Total as P	mg/l	0.22	0.24	0.23	0.59	0.51	0.43	0.31
9686	Nitrogen, Total as N	mg/l	5.5	4.6	5.3	3.5	2.2	2.2	4.7
9901	Oxygen, Dissolved, % Saturation	%	138.6	172.5	122.4	62.4	94.2	119	91.3
9924	Oxygen, Dissolved as O2	mg/l	15.1	18.5	11.7	5.51	8.28	11.4	9.32