[Report of the Medical Officer of Health for Islington, Parish of St. Mary ] page 101

St Mary (Islington) 1890

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

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101
WATER ANALYSIS.
In the following tables I state the analysis (made monthly) of the
New River Company's Water recorded by me during the year.

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Analyses of Samples taken from the Works of the Company.

1890.	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	24.60	1.224	2.006	0.302	None	0.027	1673	2.91	..	..
February	25.20	1.152	1.888	0.261	„	0.033	16.10	2.82	..	..
March	22.80	1.152	1.888	0.271	„	0.034	14.42	2.36	..	..
April	21.70	1.224	2.006	0.104	„	0.019	13.08	3.02	..	..
May	20.20	1.152	1.888	0.208	„	0.012	14.42	2.73	..	..
June	20.70	1.224	2.006	0.188	„	0.015	14.21	3.42	..	..
July	20.20	1.152	1.888	0.135	„	0.019	14.42	2.64	..	..
August	18.00	1.224	2.006	0.135	„	0.019	14.42	3.5	..	..
September	20.60	1.224	2.006	0.167	„	0.011	14.42	2.73	..	..
October	19.60	1.224	2.006	0.130	„	0.015	15.05	2.91	..	..
November	23.20	1.152	1.888	0.312	„	0.010	15.68	2.91	..	..
December	25.80	1.152	1.888	0.375	„	0.008	16.52	2.73	..	..
Average	21.88	1.188	1.947	0.215	„	0.018	15.01	2.90	..	..

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Analyses of Samples taken from the Mains of the Company.

1890.	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	..	1.170	1.917	0.253	None	0.024	16.26	..	0.055	0.019
February	..	1.176	1.927	0.274	„	0.025	15.89	..	0.072	0.019
March	..	1.152	1.888	0.250	„	0.018	14.79	..	0.053	0.014
April	..	1.170	1.917	0.206	„	0.016	15.18	..	0.069	0.016
May	..	1.176	1.927	0.257	„	0.014	14.35	..	0.059	0.015
June	..	1.188	1.947	0.206	„	0.013	14.32	..	0.053	0.015
July	..	1.206	1.976	0.153	„	0.023	14.47	..	0.054	0.013
August	..	1.224	2.006	0.174	„	0.019	14.49	..	0.053	0 014
September	..	1.224	2.006	0.143	„	0.014	14.53	..	0.042	0.012
October	..	1.188	1.947	0.161	„	0.013	14.32	..	0.047	0.014
November	..	1.152	1.888	0.326	„	0.010	15.75	..	0.065	0.014
December	..	1.152	1.888	0.317	„	0.010	16.72	..	0.055	0.011
Average	..	1.181	1.936	0.226	„	0.016	15.09	..	0.056	0.014