sampling point
Derril Water At Dualstone Bridge

Description	DERRIL WATER AT DUALSTONE BRIDGE
Sampling point ID	SW-91211328
Type	Freshwater – Rivers
Status	open
Location	easting northing: 230138 100568 lat lon: 50.779744, -4.410777
Area	Devon And Cornwall
Sub-Area	Central Devon And Cornwall
Summary	143 samples taken between 2024 and 2000

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.

26 determinands have been measured at this site

Action taken
Alky pH 4.5
Ammonia(N)
BOD ATU
Calcium - Ca
Cond @ 25C
Cu Filtered
Hardness
Hdnss Ca
Hdnss Mg
Magnesium-Mg
N Inorganic
N Oxidised
NH3 un-ion
Nitrate-N
Nitrite-N
O Diss %sat
Orthophospht
Oxygen Diss
Potassium- K
Sld Sus@105C
Temp Water
Type of Flow
WethPresPrec
Zinc - as Zn
pH

Displaying the twenty most recent samples. You can see all 143 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).

Samples from 11 Sep 2023 to 26 Jul 2024

Notation	Determinand	Units	11 Sep 2023 11:12	2 Oct 2023 11:11	25 Oct 2023 12:48	13 Nov 2023 15:04	6 Dec 2023 12:40	3 Jan 2024 12:23	13 Feb 2024 12:02	4 Mar 2024 11:37	21 Jun 2024 10:00	26 Jul 2024 12:07
0061	pH		7.4	7.32	7.17	7.16	7.19	7.16	7.4	7.31	7.39	7.48
0076	Temperature of Water	°C	17.3	15	11.4	11.8	6.4	9.3	8.4	6.8	13.1	15.2
0077	Conductivity at 25 C	μs/cm	260	225	176	182	197	168	201	194	274	252
0085	BOD : 5 Day ATU	mg/l									1.2	1.3
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	0.11	0.11	0.06	0.098	0.16	0.25	0.48	0.055	0.035
0116	Nitrogen, Total Oxidised as N	mg/l	1.7	1.6	1.2	1.4	1.9	1.3	1.8	1.4	1.5	1.9
0117	Nitrate as N	mg/l	1.7	1.58	1.19	1.39	1.89	1.29	1.79	1.39	1.48	1.89
0118	Nitrite as N	mg/l	0.0041	0.019	0.0081	0.0077	0.0059	0.0088	0.012	0.0089	0.02	0.0053
0119	Ammonia un-ionised as N	mg/l	< 0.00024	0.00062	0.00033	0.00018	0.00022	0.00041	0.00103	0.00143	0.00031	0.00029
0135	Solids, Suspended at 105 C	mg/l	9.8	13	26	22	9.1	75	14	12
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	74	61	50	44	46	41	52	55	80	69
0180	Orthophosphate, reactive as P	mg/l	0.13	0.062	0.072	0.045	0.044	0.054	0.074	0.09	0.088	0.15
9901	Oxygen, Dissolved, % Saturation	%	77.4	84.5	90.7	91.5	94.1	93	95.3	93.2	73.2	82
9924	Oxygen, Dissolved as O2	mg/l	7.41	8.5	9.89	9.88	11.6	10.7	11.2	11.4	7.68	8.21

Samples from 6 Oct 2021 to 27 Jul 2023

Notation	Determinand	Units	6 Oct 2021 08:58	2 Nov 2021 12:09	2 Dec 2021 12:19	5 Jan 2022 12:52	4 Feb 2022 08:58	2 Mar 2022 11:04	27 Apr 2023 11:52	11 May 2023 12:14	14 Jun 2023 14:44	27 Jul 2023 10:54
0061	pH		7.01	7.4	7.32	7.7	7.6	7.26	7.34	7.3	7.62	7.41
0076	Temperature of Water	°C	12.1	10	7.1	6.8	7.8	8.2	10	12.2	17.7	15.2
0077	Conductivity at 25 C	μs/cm	194	164	202	203	204	234	216	194	283	203
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	0.054	0.041	0.036	0.27	0.25	0.041	0.03	0.032	0.073
0116	Nitrogen, Total Oxidised as N	mg/l	2.3	1.3	1.4	1.7	1.1	0.85	1.3	1.8	1.7	1.7
0117	Nitrate as N	mg/l	2.29	1.29	1.4	1.7	1.09	0.842	1.29	1.79	1.69	1.68
0118	Nitrite as N	mg/l	0.0068	0.0061	0.0046	0.0045	0.0075	0.0083	0.0059	0.0064	0.0062	0.02
0119	Ammonia un-ionised as N	mg/l	< 7.0e-05	0.00025	0.00013	0.00026	0.00168	0.00074	0.00017	0.00013	0.00043	0.00051
0135	Solids, Suspended at 105 C	mg/l	17	23	19	8	370	21	17	17	6.8	32
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	40	40	45	48	52	39	58	48	80	41
0180	Orthophosphate, reactive as P	mg/l	0.058	0.075	0.048	0.041	0.094	0.047	0.057	0.049	0.086	0.14
9901	Oxygen, Dissolved, % Saturation	%	93.5	85	95.4	95	92.2	96	91.4	95.5	78.3	89.5
9924	Oxygen, Dissolved as O2	mg/l	10	9.58	11.5	11.6	11	11.3	10.3	10.2	7.44	8.96

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sampling point Derril Water At Dualstone Bridge

Determinands

Sampling results

Samples from 11 Sep 2023 to 26 Jul 2024

Samples from 6 Oct 2021 to 27 Jul 2023

sampling point
Derril Water At Dualstone Bridge