Showing papers on "Trace metal published in 1969"

Process for preparing micronutrients and products produced thereby

Abstract: TRACE METAL MICRONUTRIENTS, IN THE FORM OF A SOLUBLE COMPLEX OF THE TRACE METAL IN THE ACID SOLUBLE PORTION OF AN AQUEOUS ALKALINE LICORICE ROOT EXTRACT, ARE PRODUCED BY REACTING THE AQUEOUS ALKALINE EXTRACT OF LICORICE ROOT MINERAL ACID FOLLOWED BY REACTION OF THE RESULTING ACID SOLUBLE MATERIAL WITH AN ALKALINE OR NEUTRAL COMPOUND OF A TRACE METAL, TO FORM THE SOLUBLE TRACE METAL-LICORICE ROOT EXTRACT COMPLEX.

A combination of ring-oven and circular chromatography for trace metal analysis

Abstract: A chromatographic method for metal chelates of pyridine-2-aldehyde-2-quinolylhydrazone (PA QH) has been adapted to the ring-oven technique Advantage has been taken of the large difference inR f -values of the cobalt, copper, nickel and iron(III) chelates on alumina, the acid stability of the cobalt PA QH complex, selective formation of chloride complexes of these metals and the use of specific spray reagents for copper and iron, such as rubeanic acid and KSCN to develop a simple and rapid field method for trace metal analysis. Quantitative estimation of these four metals with an accuracy ranging from 5.0 to 12% has been carried out in less than 30 minutes. Detection limits were found to be about 0.010μg for nickel, 0.008μg for copper and iron and 0.005μg for cobalt. Other ions did not interfere in up to 10-fold excess. The suitability of this method for field work was tested by monitoring trace metals in fresh and sea water supplies and in algae.

Trace metal zonation in a native copper nugget from the McCarthy District, Alaska

Abstract: Trace concentrations of silver, antimony, iron, zinc, nickel, cobalt, chromium, lead, and manganese were determined for seven native copper nuggets collected from interior Alaska and for two samples of native copper from the Lake Superior district. The analyzed coppers are remarkably pure, the total trace content of elements determined in this study ranging from 0.0156 to 0.0598 percent.The bulk concentration and variation of analyzed trace metals are similar in the native coppers from Alaska and Lake Superior, an unexpected result which suggests that similar geochemical processes may be involved in the genesis of native copper in greenstones at widely separated localities.Serial samples taken from a drill hole in a large copper nugget show an increase of silver, antimony, and zinc toward the core of the mass, and trace metal variations include minor reversals which suggest cyclic zonation.

Increased component concentration of nutrient solutions of trace metals

Abstract: A SOLUTION SUITABLE FOR APPLICATION TO PLANTS AND SOIL TO CORRECT A PLURALITY OF TRACE METAL DEFICIENCIES DESCRIBED WHICH COMPRISES AN AQUEOUS SOLUTION OF THE SULFATE SALTS OF TWO OR MORE OR IRON, ZINC AND MANGANESE TOGETHER WITH MONO-POTASSIUM OR NONO-AMMONIUM HYDRO- GEN ORTHOPHOSPHATE HAVING AN ACIDIC PH VALUE FROM ABOUT 1.5 TO ABOUT 4, AND WHEREIN THE COMPONENTS OF THE SOLUTION MANIFEST A MUTUALLY INCREASED SOLUBILITY.

Trace metals in plant diseases

Abstract: Trace metals play a very important role in the health and disease of plants. Iron, zinc, manganese, copper and molybdenum are essential to all fungi. Boron is not shown to be essential for fungi. The phenomenon of ion antagonism in fungi, although conclusively demonstrated, has been little understood. Further work is necessary to elucidate the interaction between pH of the medium, ion antagonism and trace metal requirements by fungi.In vitro experiments revealed the influence of trace metals on the production of enzymes and/or toxins by plant pathogenic fungi and these results point to the possibility of control of vascular wilt diseases by altering the metal concentrations available to plants by soil amendments.