No abstract

ANALYTICAL EDITION 79 calcium. This solution was standardized by precipitating as calcium oxalate, igniting to calcium oxide, and weighing. Independent standardizations checked to within 1 per cent error.A solution of c. p. magnesium sulfate containing about 1.5 mg. per cc. was used as a source of magnesium. This solution was standardized by precipitating as magnesium ammonium phosphate, igniting to magnesium pyrophosphate, and weighing. Independent standardizations checked to within 1 per cent error.The results of determinations made on the known samples are given in Table I, and the correction curves (Figure 1) were plotted from these results. The computed values for (1931).

No abstract

FORMALDEHYDEis one of the common contaminants of the industrial environment. Its presence in the air constitutes a potential health hazard. Maximal allowable concentrations for its presence in air continue to be formulated and this, of course, necessitates accurate methods for its estimation.

o r )~. (Introduced by F. S. Daft.) Fro I t 1 t h t J~flthoIo!i!i / , r i h~t *~i t o t ! i i l~l~l I l l ( I t l d i i s t rial Il?{gie11~ Remi rch Laboratory, Nntionn!