Mineral element content

Table 15. Mineral Element Content of Cocoa and Chocolate Products., mg/100g ...

Mitteldorf AJ, Landon DO. 1952. Spectrochemical determination of the mineral-element content of beef. Analytical Chemistry 24 469-472. 

J. Vetter, Mineral element content of edible and poisonous macrofungi, Acta Aliment. Hung., 19 (1990), 27-40. 

TABLE 11. Mineral Elements Content in Canola Oils (mg/kg). 

Table 6.4 Majority mineral element content In some crops and foods. ...

The content of mineral substances in honey samples ranges from 0.2 to 10.3 g/kg (White, 1975). Potassium is the main mineral element with an... 

XRF analyses of the profile till sampling reflects lower variation of trace element content. However, it is possible to see indications of mineralized bedrock as relatively higher element concentrations particularly, if overburden is thin. 

Since the biogeochemical model PROFILE includes such important characteristics as mineral abundance, another model UPPSALA has been created that allows the researcher to calculate the soil mineralogical composition on the basis of total element content. The combination of these models (PROFILE and UPPSALA) gives the possibility to use existing soil and ecosystem databases for calculating critical loads of acidity in broad-scale regions. 

Along with this were investigations of the elemental content of plants and the relationship between those elements found in soil and those found in plants. As these investigations advanced, it became evident that the inorganic components in soil were essential to plant growth and that crop production could be increased by increasing certain mineral components in soil. It did not take too long to determine that ammonia, phosphorous, and potassium are the three essential components that increase plant productivity. At this early point,... 

Trace element contents in rocks intersected by drill holes WB-08-03 to WB-08-06 are associated with altered rhyolite Spearman rank correlation coefficients for Ag, Mo and S with Au are moderate to high. Correlation coefficients for Au with As, Cu, Sb and Mo in drill hole WB08-11 (vuggy quartz) are moderate to high. These element correlations suggest that mineralization may be related to an epithermal system (Panteleyev 1995). 

Recently, methods for quantitatively determining the chemical element composition of solid materials by x-ray emission spectroscopy using the electron microprobe have become available. A significant advantage of the electron microprobe, compared with methods for bulk analysis. Is Its capability for rapid analysis of many different mlcron-slze areas of a solid sample. Thus, In a relatively short time, we can obtain several hundred quantitative analyses of the chemical element content of a solid sample. These analyses usually will be different because sample homogeneity Is absent on the micron level. Thus, each chemical analysis Is a linear sum of the chemical elements In the subset of minerals present at that location. Generally, we expect the number of minerals present In a mlcron-slze spot to be less than the total number of minerals In the bulk sample. 

There are three main reasons for digesting soils in hot acid - to determine the organic carbon content, to extract mineral elements for their total content, and to determine total nitrogen by the Kjeldahl digestion. 

The relationships of mineral matter to ash content are discussed. Concentrations of chemical elements are mentioned, and the mineral matter contents of petrographic components are summarized. 

Preliminary studies have shown that it is possible to remove over half of the potentially toxic trace elements present in coal when the mineral matter is reduced by coal washing. When coal is burned in a power plant, about 13% of the mercury and about 50% of the lead and cadmium may remain with the fly ash. Analytical chemical techniques have been developed to determine Hg, Cu, Cr, Mn, Ni, Cd, Pb, and F in coal and fly ash. These techniques produce accurate and precise results despite the fact that there are no coals with established trace element content, except for mercury. 

Other mineral elements are present in citrus juices in measurable quantities. McHard et al. (34) reported on the trace element contents of Florida and Brazilian orange juice. They cited concentration ranges for 25 elements. Ting (23) reported that calcium, iron, phosphorus, magnesium, zinc, and copper are present in reconstituted FCOJ at levels equivalent to about 1% to 5% of their respective U.S. RDA s. 

SIMS has become one of the most important tools for the characterization of experimental products because of its minimal sample requirements, high spatial resolution, excellent sensitivity, and unsurpassed ability for depth-profile measurements. Most of the experimental work can be split into two different areas. The first consists of studies examining diffusion rates of different elements in minerals or melts under a variety of pressure, temperature, and fluid conditions, typically by using an isotopically enriched tracer. These analyses are done either by cutting a surface parallel to the diffusion direction and taking a traverse of spot analyses (for conditions in which profiles in the tens to hundreds of micrometers are expected) or by depth-profiling in from the mineral surface to depths of as much as 5-10 micrometers. In the latter mode, depth resolution on the tens of nanometer scale is possible (see Chapter 4). The second area is focused on determining partition coefficients for trace elements between different minerals and fluids/melts at specific temperatures, pressures, and fluid conditions, to provide the data needed to interpret trace element contents measured in natural minerals. This type of analysis typically involves spot analysis of mineral run products. 

Zewdie and Bosland (2001) found that capsaicinoid profiles were not good chemo-taxonomic indicators for Capsicum species. They also found that it was not always true to state that capsaicin and dihydrocapsaicin were the major capsaicinoids. Changes in the mineral elements and capsaicin content of chilli (C. annuum L. and C. frutescence L.) fruits during development were studied in chilli cultivars, Krishna, Pusa Jawala and Pusa Sadabahar. Of the two edible stages... 

Das, P., Borua, I., Sarkar, C.R. and Phookan, A.K. (1996) Changes in mineral elements and capsaicin content of chilli (Capsicum annum L. and Capsicum frutescens L.) fruits during development. Journal of the Agricultural Science Society of North East India 9(1), 104-106. 

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