Abstract
The application of the aluminium-haematoxylin reagent to the determination of fluoride in sea-water, river and potable waters, and sewage effluent is described. It has been shown that down to a level of about 0.1 p.p.m. the fluoride can be determined directly (i.e. without prior separation by distillation); there is some loss in accuracy for amounts of the order of 0.2–0.5 p.p.m. With sea-water, calibra tions should be carried out in a blank of artificial sea-water. The fluoride contents of a number of British rivers etc., are given.
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