[Report of the Medical Officer of Health for Chislehurst] page 52

Chislehurst 1958

[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 during1958.

Milligrammes per litre (unless otherwise stated).

Description of the Sample	Bexley Well	Orpington Well	North Orpington Well	Short-lands No. 1	Short-lands No. 2	Short-lands No. 3	Eynsford WeU	Eynsford Bore Hole	Horton Kirby Well	Wilmington No. I Well	Wilmington No. 2 Well	Darenth Well	Darenth Bore Hole	Thames- derived
Ammonia Nitrogen	0.005	Nil	NU	Nil	Nil	Nil	0.002	0.003	0.002	0.011	0.009	NU	0.002	0.027
Albuminoid Nitrogen	0.020	0.025	0.018	0.017	0.025	0.020	0.030	0.020	0.018	0.026	0.024	0.019	0.023	0.077
Oxidised Nitrogen—Nitrite	—	—	—		—	—	—	—	—	—	—	—	—	—
Oxidised Nitrogen—Nitrate	5.6	6.9	5.2	5.1	5.0	5.2	4.8	3.3	5.0	5.6	7.3	5.4	5.9	4.2
Chlorides as CI	17	15	14	17	16	18	17	15	17	21	22	16	17	26
Oxygen abs. from Permanganate 4 hrs. at 27°C.	0.15	0.05	0.07	0.03	0.03	0.05	0.08	0.06	0.12	0.14	0.13	0.06	0.08	1.26
Turbidity in terms of Silica	Nil	Nil	Nil	Nil	Nil	Nil	0.1	Nil	Nil	0.9	Nil	Nil	Nil	0.3
Colour, m.m. brown 2 ft. Tube Burgess's Tintometer	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	Nil	12
Hardness (Total)	302	272	260	278	278	284	268	254	262	280	294	260	274	270
Hardness (non-carbonate)	64	36	20	60	58	72	40	32	42	48	60	30	38	66
pH Value	7.2	7.2	7.3	7.2	7.3	7.3	7.3	7.3	7.3	7.3	7.3	7.2	7.2	7.9
Phosphate as P0₄	—	—	—	—	—	—	—	—	—	-	—	—	—	0.85
Silicate as SiO₂	-	-	-	-	-	-	-	-	-	-	-	-	-	9
Sulphate as SO₄	-	-	-	-	-	-	-	-	-	-	-	-	-	58
Magnesium as Mg.	-	-	-	-	-	-	-	-	-	-	-	-	-	5
Fluorine F	-	-	-	-	-	-	-	-	-	-	-	-	-	0.15
Electrical Conductivity (geramhos)	550	525	500	525	525	550	475	450	500	525	550	475	525	550