scholarly journals Volcanic soils composition impact on the major mineral elements content of grapes and wines

OENO One ◽  
2003 ◽  
Vol 37 (3) ◽  
pp. 171
Author(s):  
María Teresa Ribeiro de Lima ◽  
Marie-Thérèse Cabanis ◽  
Geneviève Cassanas ◽  
Lurdes Matos ◽  
Jorge Pinheiro ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Atomic Absorption ◽  
Major Elements ◽  
Mineral Elements ◽  
Volcanic Soils ◽  
Potassium Sodium ◽  
Sodium Calcium ◽  
Mineral Profile ◽  
Calcium And Magnesium

<p style="text-align: justify;">The analysis of potassium, sodium, calcium and magnesium was carried out in soils, grapes and wines of wine regions of the Azores in order to obtain a mineral profile of the principal major elements. It would be of interest to achieve a profile of these minerals, according to the climate, to the position of the Islands and to their volcanic soils. Determinations were carried out by atomic absorption in flame. A statistical analysis of the findings was performed. This study establishes the diversity of wine regions in the Azores. As a whole, the amounts in the wines are in the european average.</p>

scholarly journals Determination of free and combined plant acids

1969 ◽  
Vol 41 (4) ◽  
pp. 277-289
Author(s):  
Maija-Liisa Salo ◽  
Kaija Kotilainen
Keyword(s):  
Analytical Procedure ◽  
Water Extract ◽  
Ion Exchanger ◽  
Inorganic Salts ◽  
Total Acidity ◽  
Potassium Sodium ◽  
Sodium Calcium ◽  
Batch Technique ◽  
Calcium And Magnesium

A method is presented for the determination of the total amounts of plant acids and associated cations, viz. potassium, sodium, calcium and magnesium. The principle of the method is as follows: The acids and salts are extracted into water, and the cations retained by an Amberlite IR-120H+ resin using a batch technique. The acids are titrated electrometrically to pH 9.0. The cations are eluted from the resin and determined by flame photometry. As the inorganic salts present in the water extract are converted by the ion exchanger to the corresponding acids, the total acidity value is corrected for the chlorides, phosphates and nitrates present. The free and combined plant acids are calculated on the basis of the results obtained. The various stages of the analytical procedure are discussed and the results obtained in the analyses of 17 different fodders and foodstuffs are given as examples.

scholarly journals The Responses of Heteroxenia (Alcyonaria) to Stimulation and to some Inorganic Ions

1956 ◽  
Vol 33 (3) ◽  
pp. 604-614
Author(s):  
G. A. HORRIDGE
Keyword(s):  
Refractory Period ◽  
Inorganic Ions ◽  
The Other ◽  
Conducting System ◽  
Magnesium Ions ◽  
Absolute Refractory Period ◽  
Potassium Sodium ◽  
Sodium Calcium ◽  
Calcium And Magnesium ◽  
Calcium And Magnesium Ions

1. In Heteroxenia there are two distinct kinds of response; one is the unco-ordinated rhythm of the autozooids; the other is the maintained spasm which is co-ordinated over the colony. 2. The absolute refractory period of the conducting system which co-ordinates the spasm of the colony is found to be 0.08 sec. 3. The actions of excesses of potassium, sodium, calcium and magnesium ions suggest that the rhythm resembles that of Scyphozoa. 4. The organization and overlap of the two conducting systems in the autozooid disk recall the scyphozoan pattern of two nerve nets. However, in Heteroxenia there is little evidence of interaction between the two systems.

Near infrared spectroscopy for the analysis of macro and micro nutrients in sugarcane leaves

2012 ◽  
pp. 707-710 ◽  
Author(s):  
Cristhian J. Yarce ◽  
Giovanni Rojas
Keyword(s):  
Infrared Spectroscopy ◽  
Statistical Analysis ◽  
Atomic Absorption ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Research Center ◽  
Sugarcane Research ◽  
Single Experiment ◽  
Calcium And Magnesium

About ten years ago, NIR technology was implemented at the Colombian Sugarcane Research Center Cenicaña for the analysis of sugarcane quality, followed by the development of methodologies for the quantification of some elements in soils and sugarcane leaves. Methodologies were based on the presence of high content materials, such nitrogen, potassium, calcium, and magnesium; however, determination of micronutrients which are found in soils and leaves in the range of parts per million has been challenging. Development of a NIR methodology for quantification of macro (N, P, K, Ca, Mg) and micronutrients (Cu, Zn, Mn, Fe) in a single experiment is here reported. Calibration curves were constructed using approximately 500 samples that were previously analyzed by methods of reference such atomic absorption. Statistical analysis of the data showed that there are not significant differences between the methods of reference and NIR, suggesting that NIR is a very fast, economical and convenient methodology for the daily analysis of sugarcane leaves.

Contribution to the Physical Chemistry of Hevea Latex. I. Metal Cations in Latex

1952 ◽  
Vol 25 (1) ◽  
pp. 124-132 ◽  
Author(s):  
Robert Belmas
Keyword(s):  
Physical Chemistry ◽  
Colloidal Stability ◽  
Metal Cations ◽  
Soluble Form ◽  
Potassium Sodium ◽  
Sodium Calcium ◽  
Iron Copper ◽  
Physico Chemical ◽  
Rubber Particles ◽  
Calcium And Magnesium

Abstract Our knowledge of Hevea latex is still incomplete, and some problems, such, for example, as a study of its natural inorganic ingredients, have not been attacked. Some work of value has been done on the analysis of the ash from latex and on the influence of metals in solution on the colloidal stability of latex, but few facts are available concerning the physico-chemical state of these metals in the natural emulsion and their partition between the serum and rubber particles. The investigation which is described in the present paper is devoted to metal components which are capable of influencing, when in soluble form, the colloidal behavior of latex. These include potassium sodium, calcium, and magnesium and, under some conditions, iron. Copper and manganese were not studied in this work for they have been the object of numerous investigations, and these metals play in effect the part of powerful prooxygenic agents in the oxidation of rubber.

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