sampling point
Rib At Westmill

Description	RIB AT WESTMILL
Sampling point ID	TH-PLER0126
Type	Freshwater – Rivers
Status	open
Location	easting northing: 537220 227130 lat lon: 51.925776, -0.005843
Area	Hertfordshire And North London
Sub-Area	L&W Herts & North London
Summary	265 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.

96 determinands have been measured at this site

1,1,1-TCA
112TCEthan
2,4-D
2,4-D be
2,4-D bge
2,4-D ioe
2,4-D m e
2-CHLORO-4-N
2-CHLORO-6-N
24Dichloropl
2Chlorophenl
4Cl2Ntoluene
4Cl3MePhenol
4Cl3NToluene
Action taken
Alky pH 4.5
Ammonia(N)
Arsenic - As
As-Filtered
Atrazine
Azinphos Myl
BOD ATU
Bentazone
Benzene
Biphenyl
Boron - as B
C - Org Filt
Ca Filtered
Cadmium - Cd
Calcium - Ca
Cd Filtered
Chloride Ion
Chromium -Cr
Cond @ 20C
Cond @ 25C
Copper - Cu
Cr- Filtered
Cu Filtered
Cyfluthrin
DemetonSMyl
Dichlorvos
Dimethoate
EndosulphanA
EndosulphanB
Fe- Filt
Fenitrothion
Flucofuron
Hardness
Hg Filtered
Iron - as Fe
Lead - as Pb
Linuron
Magnesium-Mg
Malathion
Mecoprop
Mercury - Hg
Mevinphos
Mg Filtered
N Oxidised
NH3 un-ion
Naphthalene
Ni- Filtered
Nickel - Ni
Nitrate-N
Nitrite-N
O Diss %sat
Oil & Grs Vs
Orthophospht
Oxygen Diss
PCSDs
Pb Filtered
Permethrn-Tr
Permethrn-cs
Phenol Odour
SI-EC-CD
SI-EC-F
SI-EC-HG
SI-GQA
SI-LIST2
Simazine
Sld Sus@105C
SulcofuronNa
Temp Water
Toluene
TriBT Cation
TriPT Cation
Triazophos
Trifluralin
Type of Flow
Vanadium - V
Zinc - as Zn
Zn- Filtered
m-p-Xylene
o-Xylene
pH
pH in-situ

Displaying the twenty most recent samples. You can see all 265 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).

Samples from 1 Aug 2023 to 1 Jul 2024

Notation	Determinand	Units	1 Aug 2023 10:49	1 Sep 2023 08:02	5 Oct 2023 08:20	3 Nov 2023 10:36	5 Dec 2023 09:23	4 Jan 2024 10:43	1 Feb 2024 13:00	6 Mar 2024 08:34	6 Jun 2024 12:51	1 Jul 2024 08:21
0061	pH		7.26	7.14	7.23	8.11	8.07	7.89	7.51	7.64	7.49	7.33
0076	Temperature of Water	°C	13.2	12.4	12.2	10.4	6.7	7.9	8.7	8.2	12.2	12.6
0077	Conductivity at 25 C	μs/cm	887	943	939	706	744	757	863	836	863	906
0103	Mercury, Dissolved	μg/l	< 0.01			< 0.01			< 0.01
0106	Cadmium, Dissolved	μg/l	0.013			0.011			0.012
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	< 0.03	0.16	< 0.03	0.036	< 0.03	0.42	< 0.03	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	14	16	18	20	17	13	14	11	13	15
0117	Nitrate as N	mg/l	14	16	18	20	17	13	14	10.9	13	15
0118	Nitrite as N	mg/l	0.026	0.013	0.024	0.026	0.015	0.018	0.017	0.1	0.027	0.036
0119	Ammonia un-ionised as N	mg/l	< 0.00013	< 9.0e-05	< 0.00011	0.00301	< 0.00043	0.00044	< 0.00016	0.00296	< 0.0002	< 0.00014
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	260	260	250	230	250	270	280	300	280	270
0180	Orthophosphate, reactive as P	mg/l	1.3	1.9	1.9	0.15	0.2	0.22	0.51	0.39	0.59	1.3
0235	Magnesium, Dissolved	mg/l	4.1			2.7			4
0239	Calcium, Dissolved	mg/l	140			130			150
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l	2.3			6.6			2.3
9901	Oxygen, Dissolved, % Saturation	%	71.9	70.1	65.6	96.4	95.1	91.3	84.7	83.3	86.3	71.5
9924	Oxygen, Dissolved as O2	mg/l	7.52	7.47	7.02	10.8	11.6	10.8	9.85	9.8	9.24	7.58

Samples from 10 Oct 2022 to 3 Jul 2023

Notation	Determinand	Units	10 Oct 2022 14:44	2 Nov 2022 14:05	1 Dec 2022 13:10	19 Jan 2023 12:10	3 Feb 2023 10:25	2 Mar 2023 10:35	27 Apr 2023 12:57	30 May 2023 11:35	1 Jun 2023 09:54	3 Jul 2023 13:51
0061	pH		7.73	7.4	7.54	7.53	7.31	7.43	7.56	7.33	7.25	7.28
0076	Temperature of Water	°C	12.4	12.8	9.5	7	9.4	8.1	10.3	11.6	11.1	12.7
0077	Conductivity at 25 C	μs/cm	1173	731	985	919	927	930	884	911	919	932
0103	Mercury, Dissolved	μg/l								< 0.01
0106	Cadmium, Dissolved	μg/l								0.017
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	0.29	0.33	0.18	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	28	13	18	16	18	17	15	15	16	16
0117	Nitrate as N	mg/l	28	12.9	17.8	15.9	17.9	17	15	15	16	16
0118	Nitrite as N	mg/l	0.045	0.079	0.16	0.11	0.1	0.022	0.025	0.044	0.031	0.038
0119	Ammonia un-ionised as N	mg/l	< 0.00035	0.00166	0.00204	0.0009	< 0.00011	< 0.00013	< 0.00021	< 0.00013	< 0.00011	< 0.00013
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	210	180	270	250	270	250	290	260	280	260
0180	Orthophosphate, reactive as P	mg/l	4.9	2.2	2	0.8	1.2	1.3	0.83	1	1	1.5
0235	Magnesium, Dissolved	mg/l								4.2
0239	Calcium, Dissolved	mg/l								150
0301	Carbon, Organic, Dissolved as C :- {DOC}	mg/l								2.3
9901	Oxygen, Dissolved, % Saturation	%	76.4	67.2	68.8	83.1	74.4	83.5	105.8	76.8	73.4	73.4
9924	Oxygen, Dissolved as O2	mg/l	8.14	7.1	7.84	10.1	8.5	9.85	11.8	8.33	8.06	7.77

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sampling point Rib At Westmill

Determinands

Sampling results

Samples from 1 Aug 2023 to 1 Jul 2024

Samples from 10 Oct 2022 to 3 Jul 2023

sampling point
Rib At Westmill