[Report of the Medical Officer of Health for Chislehurst] page 56

Chislehurst 1960

[Report of the Medical Officer of Health for Chislehurst]

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Average Results of the Chemical Examination of the water supplied to the Urban District of Chislehurst and Sidcup during

1960

Milligrammes per litre (unless otherwise stated).

Description of the Sample	Bexley	Darenth	Eynsford	Horton Kirby	Orpington	North Orpington	Shortlands	Wilmington	Thames derived
No. of Samples	4	6	7	6	4	4	12	3	156
Ammonia Nitrogen	0.011	0.011	0.013	0.012	0.015	0.013	0.016	0.012	0.038
Albuminoid Nitrogen	0.016	0.022	0.020	0022	0.021	0.023	0.026	0.028	0.080
Oxidised Nitrogen—Nitrite	-	-	-	-	-	-	-	-	-
Oxidised Nitrogen—Nitrate	5.8	5.5	4.1	4.5	6.6	5.0	5.3	7.8	4.0
Chlorides as CI.	18	17	16	17	15	14	18	22	28
Oxygen abs. from Permanganate 4 hrs. at 27°C.	0.10	0.06	0.06	0.04	0.04	0.04	0.04	0.10	1.26
Turbidity Units	Nil	0.7	Nil	Nil	Nil	0.1	Nil	Nil	03
Colour mm. brown 2 ft. Tube Burgess's Tintometer	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	14
Hardness (Total)	286	268	258	258	278	266	282	284	254
Hardness (non-carbonate)	50	40	32	38	42	30	64	54	68
pH Value	7.2	7.2	7.3	7.2	7.1	7.1	7.2	7.1	7.8
Phosphate as PO	-	-	-	-	-	-	-	-	1.00
Silicate as SiO₂	-	-	-	-	-	-	-		9
Sulphate as SO₄	32	22	16	20	16	12	44	30	58
Fluoride as F	0.1	0.2	0.2	0.15	0.1	0.1	0.15	0.13	0.25
Magnesium as Mg	-	-	-	-	-	-	-	-	4
Surface Active Material as
Maroxol	-	-	-	-	-	-	-	-	0.12
Free CO₂	35	35	32	30	38	36	31	38	-
Electrical Conductivity (gemmhos)	500	500	475	475	500	475	525	550	525