London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Hillingdon 1970
[Report of the Medical Officer of Health for Hillingdon]
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| Sample No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Date taken | 9.4.70 | 9.4.70 | 10.6.70 | 22.10.70 | 29.10.70 | 24.11.70 | 14.1.71 | 14.1.71 |
| Location of Sample | Channel | 200 yds down stream | Channel | 200 yds down stream | 200 yds down stream | 200 yds down stream | Channel | 100 yds down stream |
| Appearance | Fairly clear | Clear | Clear | Fairly clear | Fairly clear | Fairly clear | Yellowish clear | Yellowish clear |
| Odour | Earthy | Earthy | Earthy | Earthy | Earthy | Earthy | Earthy | Earthy |
| Reaction pH | 7.6 | 7.3 | 7.4 | 7 .0 | 7.5 | 7.7 | 7.6 | 7.7 |
| Total dissolved solids | 718 | 692 | 651 | 746 | 721 | |||
| Suspended solids | 5 | 6 | 5 | 15 | 5 | 3 | 9 | 5 |
| Chlorion | 117 | 97 | 117 | 129 | 112 | 100 | 122 | 114 |
| Ammonical Nitrogen | 3.28 | 4.72 | 2.64 | 6.1 | 3.28 | 2.13 | 1.0 | 0.5 |
| Albuminoid Nitrogen | 3.28 | 4.00 | 0.21 | 4.2 | 0.48 | 0.60 | 0.6 | 1.6 |
| Nitrate Nitrogen | 22 | 16 | 10 | 8 | 4 | 5.2 | 10.0 | 13 |
| Nitrite Nitrogen | 1.00 | 0.50 | 0.10 | 0.21 | 0.10 | 0.1 | absent | absent |
| Permanganate value | 10.9 | 8.3 | 6.20 | 8.6 | 5.3 | 6.3 | 8.5 | 7.9 |
| Total Alkalinity | 291 | 214 | 202 | 185 | 181 | 175 | ||
| B.O.D. | 23 | 9 | 12 | 20 | 9 | 6 | 5 | 6 |
| Anionic Detergent Manoxol OT | 0.2 | 0.2 | ||||||
| Remarks: | High organic content B.O.D. excess | Similar to effluent B.O.D. lower | Satis. B.O.D. | High organic content Satis. B.O.D. | Effect of effluent show from sewage works | Not exceptionally high— Satisfactory | Not exceptionally high— Satisfactory | Not exceptionally high— Satisfactory |