[Report of the Medical Officer of Health for Islington, Parish of St. Mary ] page -

St Mary (Islington) 1891

[Report of the Medical Officer of Health for Islington, Parish of St. Mary ]

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18
WATER ANALYSIS.
In the following tables I state the analysis (made monthly) of the
New River Company's Water recorded during the year.

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Analyses of Samples taken from the Works of the Company.

1891.	Total Solid Matter.	Chlorine.	Equal to Chloride of Sodium.	Nitrogen as Nitrates.	Nitrogen as Ammonia.	Oxygen required to oxidise Organic Matter.	Degree of Hardness.	Degree after boiling of an hour.	Organic Carbon.	Organic Nitrogen.
January	24.20	1.152	1.888	0.396	None	0.015	16.95	2.73	..	..
February	25.20	1.152	1.888	0.365	„	0.064	16.52	3.29	..	..
March	20.40	1.224	2.006	0.312	„	0.011	15.05	3.70	..	..
April	20.00	1.224	2.006	0.354	„	0.026	15.05	2.73	..	..
May	19.60	1.224	2.006	0.2.29	„	0.011	15.89	2.82	..	..
June	21.00	1.224	2.006	0.261	„	0.024	16.10	3.0	..	..
July	20.00	1.296	2.124	0.208	„	0.019	14.63	2.73	..	..
August	20.20	1.224	2.006	0.198	„	0.018	15.26	3.8	..	..
September	19.40	1.296	2.124	0 208	„	0.011	15.68	1.91	..	..
October	21.60	1.295	2.124	0.240	„	0010	15.89	2.20	..	..
November	26.80	1.296	2.124	0.312	„	0.042	17.10	3.7	..	..
December	26.20	1 296	2.124	0.365	„	0.040	19.12	3.19	..	..
Average	22.05	1.241	2.035	0.287	None	0.024	16.10	2.98	..	..

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Analyses of Samples taken from the Mains of the Company.

1891.	Total Solid Matter.	Chlorine.	Equal to Chloride of Sodium.	Nitrogen as Nitrates.	Nitrogen as Ammonia.	Oxygen required to oxidise Organic Matter.	Degree of Hardness.	Degree after boiling ¼ of an hour.	Organic Carbon.	Organic Nitrogen.
January	..	1.152	1.888	0.385	None	0.012	15.89	..	0.050	0.013
February	..	1.296	2.121	0.442	„	0.035	16.89	..	0.099	0.033
March	..	1.200	1.966	0.361	„	0.015	16.24	..	0.063	0.018
April	..	1.188	1.947	0.255	„	0.020	16.05	..	0.059	0.014
May	..	1.260	2.065	0.211	„	0.015	15.79	..	0.056	0.014
June	..	1.35	2.212	0.258	„	0.027	15.36	..	0.063	0.018
July	..	1.320	21.63	0.226	„	0.019	14.63	..	0.047	0.011
August	..	1.260	2.065	0.208	„	0.016	16.25	..	0.042	0.010
September	..	1.260	2.065	0.208	„	0.016	15.42	..	0.039	0.010
October	..	1.260	2.065	0.281	„	0.041	16.0	..	0.085	0.021
November	..	1.296	2.124	0.250	„	0.046	20.22	..	0.095	0.021
December	..	1.296	21.24	0.395	„	0.037	18.26	..	0.084	0.022
Average	••	1.261	2.007	0.290	None	0.024	16.41	..	0.065	0.017