Paper, board and pulps. Determination of total magnesium, total calcium, total manganese, total iron and total copper

2015 ◽  
Keyword(s):  
Total Iron ◽  
Total Calcium ◽  
Total Copper ◽  
Total Magnesium

Citrate, calcium, phosphate and magnesium in sows' milk at initiation of lactation

1998 ◽  
Vol 65 (1) ◽  
pp. 55-68 ◽  
Author(s):  
JACQUELINE C. KENT ◽  
PETER G. ARTHUR ◽  
PETER E. HARTMANN
Keyword(s):  
Calcium Phosphate ◽  
Total Concentration ◽  
Major Determinant ◽  
Ionized Calcium ◽  
Total Calcium ◽  
Whole Milk ◽  
Total Magnesium ◽  
Total Concentrations

Colostrum and milk were collected from ten sows at frequent intervals from before farrowing until 9 d after farrowing. Ionized calcium, pH, and total concentrations of citrate, calcium, phosphate and magnesium were measured in whole milk. The diffusible fraction of the mammary secretion was separated by ultrafiltration and was used for the measurement of diffusible citrate, calcium, phosphate and magnesium. The pH before farrowing was 5·7, and increased to 6·5 on day 4 as total calcium and phosphate also increased. Before farrowing, total and diffusible citrate were 7·8 and 7·3 mM respectively, while diffusible phosphate was 11·9 mM, and these concentrations all decreased during the study period. Total magnesium ranged between 3·3 and 4·1 mM, while diffusible magnesium ranged between 2·0 and 3·1 mM. While these concentrations and patterns of change of diffusible calcium and citrate are quite different from those of women's milk during the first week after birth, theoretical physicochemical relationships between diffusible calcium and citrate, and ionized calcium and HPO42− were corroborated by these results. We conclude that diffusible citrate plays an important role in the determination of the concentration of diffusible calcium. However, while citrate may be the major determinant of the total concentration of calcium in women's milk, this is not the case in sows' milk.

The Measurement of Calcium Absorption and Absorption Rate with an External Arm Radioactivity Counter

1978 ◽  
Vol 54 (1) ◽  
pp. 93-97
Author(s):  
R. C. Smart ◽  
C. D. Holdsworth
Keyword(s):  
Absorption Rate ◽  
Calcium Absorption ◽  
Scintillation Counter ◽  
Total Calcium ◽  
Ratio Determination ◽  
Lead Shielding ◽  
Deconvolution Techniques ◽  
Serial Measurements ◽  
Radioactivity Measurements

1. A large-volume scintillation counter was used to measure calcium absorption from the ratio of forearm uptake of 47Ca after oral 47CaCl2 (administered with milk) to forearm uptake after intravenously administered 47CaCl2. 2. In some subjects serial measurements of both forearm uptake of 47Ca and blood 47Ca radioactivity were also recorded, and by using deconvolution both total calcium absorption and calcium absorption rate were determined. 3. The forearm ratio determination of 47Ca absorption correlated well with that obtained by deconvolution of either serial blood 47Ca or forearm 47Ca measurements provided that the forearm radioactivity measurements were made at least 8 h after the administrations of 47CaCl2. 4. Although the two deconvolution techniques gave similar estimates of total calcium absorption there were discrepancies between their measurements of calcium absorption rate. These discrepancies were reduced but not eliminated by the use of additional lead shielding around the Armac counter.

scholarly journals Improved Spectrophotometric Determination of Total Iron and Iron(III) with o-Hydroxyhydroquinonephthalein and Their Characterization

2011 ◽  
Vol 131 (7) ◽  
pp. 1095-1101 ◽  
Author(s):  
Mitsuru HOSHINO ◽  
Hiroyuki YASUI ◽  
Hiromu SAKURAI ◽  
Takako YAMAGUCHI ◽  
Yoshikazu FUJITA
Keyword(s):  
Spectrophotometric Determination ◽  
Total Iron

Simultaneous determination of iron(II), iron(III), and total iron in sphagnum moss peat by programmable voltammetry on a graphite tubular electrode

1981 ◽  
Vol 53 (2) ◽  
pp. 193-196 ◽  
Author(s):  
F. J. Szydlowski ◽  
D. L. Dunmire ◽  
E. E. Peck ◽  
R. L. Eggers ◽  
W. R. Matson
Keyword(s):  
Simultaneous Determination ◽  
Total Iron ◽  
Sphagnum Moss ◽  
Tubular Electrode
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