CLXIV.—Estimation of tin in wolfram. A modification of Powell's method

Volumetric Analytical Methods for Organic Compounds

“…Calcium chloride gives a constant factor of 1.01 (101). This method is similar to the one of Lubatti (84) which has been used for the determination of ethylene oxide in mixtures containing acetaldehyde, formaldehyde, and acetic acid (104).…”

Determination of Methyl Allyl Chloride

“…Vaughan and Rust {IS) prepared it by the reaction of chlorine and isobutene at 70°C. Later Briejér (7) found that it was a highly active gaseous fumigant and investigated the distribution of the gas in empty spaces and in fumigated grain and soil, using insects. The change in mortality with degree of exposure to the gas gave a rough estimate of concentration in different parts of the space or at different depths of fumigated substances or in soil.…”

“…This procedure is cartied out by employing an aeration apparatus similar to that described by Lubatti (7).…”

The fate of labelled insecticide residues in food products. II. —The nature of methyl bromide residues in fumigated wheat

“…It has been known for some time that the residual fumigant retained by fumigated and aired cereals was almost entirely decomposed, with the formation of inorganic bromide. [1][2][3] Winteringham & Harrison4 studied the rates of sorption of methyl bromide by whole and by milled wheat, the latter in order t o eliminate the rate-limiting diffusion through the seed coat of the whole grain. The gluten or protein fraction of the wheat, although present in smaller proportion than the starch or carbohydrate fraction, was largely responsible for the physical adsorption and, apparently, for the chemical decomposition of the adsorbed methyl bromide.…”