sampling point
East Looe River At Trethinnick

Description	RSN0659 TRETHINNICK
Sampling point ID	SW-RSN0659
Type	Freshwater – Rivers
Status	open
Location	easting northing: 223231 67043 lat lon: 50.476483, -4.492664
Area	Devon And Cornwall
Sub-Area	West Devon And Cornwall
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

Alk-Gran
Alky pH 4.5
Ammonia(N)
C - Org Filt
Chloride Ion
Cond @ 25C
N Oxidised
NH3 un-ion
Nitrate-N
Nitrite-N
O Diss %sat
Orthophospht
Oxygen Diss
Phosphorus-P
SiO2 Rv
Temp Water
pH

Samples from 23 Mar 2021 to 14 Dec 2021

Notation	Determinand	Units	23 Mar 2021 13:47	13 Apr 2021 13:23	19 May 2021 15:08	15 Jun 2021 14:34	23 Jul 2021 12:44	17 Aug 2021 12:58	17 Sep 2021 11:43	6 Oct 2021 14:41	23 Nov 2021 14:51	14 Dec 2021 12:12
0061	pH		7.64	7.6	7.66	7.49	7.19	7.88	7.08	7.45	7.55	7.37
0076	Temperature of Water	°C	10.8	10.4	12.4	14.9	15.3	13.4	13.6	12.5	10.5	11.6
0077	Conductivity at 25 C	μs/cm	160	162	155	162	162	160	162	153	160	157
0111	Ammoniacal Nitrogen as N	mg/l	< 0.002	0.0039	0.014	0.0067	0.0076	0.0038	0.018	0.0036	0.0039	0.0059
0116	Nitrogen, Total Oxidised as N	mg/l	5.2	4.9	3.9	4.9	3.6	3.4	4.4	4.6	5.1	5.3
0117	Nitrate as N	mg/l	5.2	4.9	3.89	4.9	3.59	3.4	4.4	4.6	5.1	5.3
0118	Nitrite as N	mg/l	0.0016	0.0023	0.0051	0.0049	0.0071	0.0017	0.0012	0.002	0.0014	0.002
0119	Ammonia un-ionised as N	mg/l	< 2.0e-05	3.0e-05	0.00014	5.0e-05	3.0e-05	7.0e-05	5.0e-05	2.0e-05	3.0e-05	3.0e-05
0162	Alkalinity to pH 4.5 as CaCO3	mg/l			24	23	23	24	25	21	23	22
0172	Chloride	mg/l			16	16	17	16	17	16	16	16
0180	Orthophosphate, reactive as P	mg/l	0.011	0.0096	0.029	0.021	0.023	0.028	0.023	0.021	0.014	0.015
0182	Silica, reactive as SiO2	mg/l	5.6	5.5	5.9	6.1	6.1	6.4	6.9	6	6.6	6.1
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	0.52	1.2	2	0.74	0.9	0.93	0.95	1.1	0.73	0.89
0348	Phosphorus, Total as P	mg/l	0.027	0.04	0.06	0.036	0.03	0.044	0.035	0.034	0.025	0.026
7610	Alkalinity to pH 4.5 : Grans Plot	mg/l	19	21
9901	Oxygen, Dissolved, % Saturation	%	96.2	98.8	97.9	96.2	98.3	105.4	96.6	98.4	99.8	100.1
9924	Oxygen, Dissolved as O2	mg/l	10.6	11	10.4	9.7	9.82	11	10	10.5	11.1	10.9

Samples from 4 Feb 2021 to 25 Feb 2021

Notation	Determinand	Units	4 Feb 2021 14:24	25 Feb 2021 11:39
0061	pH		7.45	7.48
0076	Temperature of Water	°C	10.8	11
0077	Conductivity at 25 C	μs/cm	169	160
0111	Ammoniacal Nitrogen as N	mg/l	0.066	0.0046
0116	Nitrogen, Total Oxidised as N	mg/l	5.2	5.4
0117	Nitrate as N	mg/l	5.2	5.4
0118	Nitrite as N	mg/l	0.0049	0.0014
0119	Ammonia un-ionised as N	mg/l	0.00036	3.0e-05
0180	Orthophosphate, reactive as P	mg/l	0.019	0.012
0182	Silica, reactive as SiO2	mg/l	5.2	5.2
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	0.99	0.68
0348	Phosphorus, Total as P	mg/l	0.051	0.032
7610	Alkalinity to pH 4.5 : Grans Plot	mg/l	19	19
9901	Oxygen, Dissolved, % Saturation	%	94.3	98.5
9924	Oxygen, Dissolved as O2	mg/l	10.4	10.8