Destruction of Organic Matter in Plant Material by the Use of Nitric and Perchloric Acids

Abstract

If suitable concentration methods and adequate precautions are used, concentrations of benzene well below 1 in 10,000 should be detected. Exclusion of chlorides from the extraction is necessary, as the subsequent nitration seems sensitive to their presence. A lower salt concentration than that used gave erratic results and a high salt concentration precipitated solids into the bottom layer. Exclusion of water from the nitration mixture is imperative. The pres-

Nutrient Content of Leaf Litter of Trees in the Northern Rocky Mountains

“…The litter was finely milled and digested with nitric and perchloric acids as described by Gieseking, et al 1935. Nitrogen was determined by the Kjeldahl method (A.O.A.C.…”

Elevated Carbon Dioxide Level Suppresses Nutritional Quality of Lettuce and Spinach

“…Concentration of phosphorus, potassium, calcium, magnesium, zinc, iron, copper, manganese and sulfur (SO 4 ) was determined by perchloric digest method as outlined by Gieseking et al [24]. The nutrient concentration was quantified from the perchloric digest using an Inductively Coupled Plasma (ICP) Spectrometer (Model 720-ES ICP Optical Emission Spectrometer, Varian Australia Pty Ltd., Australia).…”

A Study of Mineral Nutrition of Wheat as Influenced by Fertilizer Combinations

“…Like potassium, the soluble ash reached a maximum in the plants from all the plots at the second sampling. From the second to the third sampling a considerable loss occurred, but in the interim between the third and fourth samplings the loss was not so large in the plants from plots 4, 5, and 6 and there was even a gain in the plants from plots 2, 3, and 4. This gain in soluble ash was probably due to the combined effect of the decrease in the downward movement of potassium and the increase in the assimilation of phosphorus, sulphur, and calcium.…”

“…On all the plots the heads formed almost exactly half the dry weight of the aerial portion of the plant and the type of fertilizer treatment had little effect upon this ratio. 6. Approximately equal amounts of calcium, phosphorus, and sulphur were present in the plant at maturity, but the distribution of these elements between heads and straw varied markedly.…”

“…PHOSPHORUS.-Phosphorus was determined gravimetrically by precipitation as magnesium ammonium phosphate after first digesting the sample in a mixture of perchloric and nitric acids (5,6).…”