[Report of the Medical Officer of Health for Chislehurst] page 46

Chislehurst 1957

[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

1957.

Milligrammes per litre (unless otherwise stated).

Description of the Sample	Bexley Well	Orpington Well	North Orping ton Well	Short-lands No. 1	Short-lands No. 2	Eyns-ford Well	Eyns-ford Bore Hole	Horton kirby	Wilming ton No.1	Wilmington No. 2	Darenth Well	Darenth Bore Hole	Thames-derived
Number of Samples	3	5	4	3	2	4	4	2	4	4	4	4	1882
Ammonia Nitrogen	0.007	0.002	0.002	0.005	0.002	0.001	0.001	0.005	0.002	0.001	0.001	0.006	0.027
Albuminoid Nitrogen	0.018	0.018	0.019	0.026	0.010	0.020	0.019	0.023	0.025	0.030	0.020	0.020	0.074
Oxidised Nitrogen—Nitrite	—	—	—	—	—	—	—	—	—	—	—	—	—
Oxidised Nitrogen—Nitrate	6.5	5.8	4.4	4.3	4.5	3.2	3.3	4.5	6.2	7.4	4.6	5.0	3.9
Chlorides as Cl	17	15	13	17	18	16	16	17	22	22	16	17	29
Oxygen abs. from Perman ganate 4 hrs. at 27°C.	0.06	0.08	0.08	0.03	0.02	0.10	0.06	0.05	0.14	0.10	0.06	0.11	1.16
Turbidity in terms of Silica	Nil	Nil	Nil	Nil	Nil	0.2	Nil	0.3	Nil	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	11
Hardness (Total)	304	272	258	275	278	256	250	250	278	286	255	272	260
Hardness (non-carbonate)	66	30	21	54	57	24	24	38	44	49	22	36	56
pH Value	7.1	7.2	7.3	7.2	7.3	7.2	7.3	7.3	7.2	7.2	7.2	7.2	7.9
Phosphate as PO₄	—	—	—	—	—	—	—	—	—	—	—	—	0.90
Silicate as SiO₂	-	-	-	-	-	-	-	-	-	-	-	-	10
B.O.D. 5 days at 20°C.	-	-	-	-	-	-	-	-	-	-	-	-	-
Electrical Conductivity (gemm-hos)	575	525	475	525	525	475	475	475	525	550	500	525	550