MAGNETIC SUSCEPTIBILITY MEASUREMENTS IN MINNESOTA PART II: ANALYSIS OF FIELD RESULTS

Geophysics ◽  
1953 ◽  
Vol 18 (2) ◽  
pp. 383-393 ◽  
Author(s):  
Harold M. Mooney ◽  
Rodney Bleifuss
Keyword(s):  
Magnetic Susceptibility ◽  
Chemical Analysis ◽  
Magnetic Separation ◽  
The Other ◽  
Volume Percent ◽  
Rock Types ◽  
Magnetite Content

75 samples of 7 rock types have been analyzed for magnetite content by magnetic separation and chemical analysis, making allowance for iron which occurs as ilmenite, hematite, and silicates. Magnetic susceptibility shows a clear dependence on magnetite content but with too much scatter to permit prediction of one from the other. For small magnetite content V (in volume percent), susceptibility k is roughly given by [Formula: see text] cgs. Based on 200 outcrops of 11 rock types, the approximate mean susceptibility of basalt and diabase is [Formula: see text], of rhyolite and gabbro [Formula: see text], of acid intrusives including granite [Formula: see text], of greenstone [Formula: see text], and of slates [Formula: see text]. Variability is high for acid intrusives, intermediate for basalt, rhyolite, and greenstone, and lower for diabase, gabbro, and slate.

MAGNETIC SUSCEPTIBILITY OF BEDDED IRON‐FORMATION

Geophysics ◽  
1963 ◽  
Vol 28 (5) ◽  
pp. 756-766 ◽  
Author(s):  
Charles E. Jahren
Keyword(s):  
Magnetic Material ◽  
Magnetic Susceptibility ◽  
Diameter Ratio ◽  
Iron Formation ◽  
Volume Percent ◽  
Homogeneous Sample ◽  
Magnetite Content ◽  
The Relationship ◽  
Apparent Susceptibility ◽  
Layered Samples

The susceptiblity of natural and artificial iron‐formation samples in the form of cylinders with length‐to‐diameter ratio less than 1.2 and susceptibility up to one cgs unit was measured in fields of the order of one gauss. Demagnetization factors calculated for the centers of the cylinders explain observed changes of apparent susceptibility with length and direction of magnetization. Layered samples made by stacking disks of magnetic and nonmagnetic material alternately show susceptibility as much as three times greater parallel to the layers than across them, with layer susceptibility as high as 0.5 cgs. This anisotropy increases with increasing layer susceptibility and is largely independent of the details of layering when less than half the volume of the sample is magnetic material. Natural layered samples show the same range of susceptibility anisotropy. The relationship between susceptibility, k, and volume percent magnetite, V, can be approximated by [Formula: see text] cgs, 10<V<40, corresponding to susceptibility 0.7 for pure magnetite. The along‐the‐layer susceptibility of a bedded sample containing 20 volume percent total magnetite is twice that of a homogeneous sample of the same overall magnetite content. For one percent total magnetite, it is three times as great.

ANALYSIS FOR MAGNETITE UTILIZING MAGNETIC SUSCEPTIBILITY

Geophysics ◽  
1966 ◽  
Vol 31 (2) ◽  
pp. 398-409 ◽  
Author(s):  
P. D. Shandley ◽  
L. O. Bacon
Keyword(s):  
Magnetic Susceptibility ◽  
Chemical Analysis ◽  
Metallic Iron ◽  
Magnetic Minerals ◽  
Magnetite Content ◽  
Subsequent Calculation ◽  
The Individual ◽  
Direct Readout ◽  
Individual Particles ◽  
Iron Bearing

The analysis for magnetite or “magnetite equivalent” by means of magnetic susceptibility is more rapid, lower in cost, and in general, as precise as other methods of analysis. “Magnetite equivalent” analysis is affected by grain size if the individual particles are less than 40 microns in diameter, by the remnant magnetization if greater than about 12 percent of saturation magnetization, and by the presence of other magnetic minerals. The presence of other magnetic minerals does not reflect as great an error in the final result using the susceptibility method as in other methods. Davis tube separation as a method for magnetite analysis is affected by other magnetic minerals but is mainly dependent upon degree of mineral liberation by grinding. Chemical analysis with the subsequent calculation of magnetite content is in error due to presence of other iron‐bearing minerals whether magnetic or nonmagnetic and is particularly affected by the presence of metallic iron from sample preparation. Metallic iron apparently enters solution by the following reaction: [Formula: see text] Thus, one unit of metallic iron would be counted as approximately 12 units of magnetite in the calculation of magnetite content. Analysis for “magnetite equivalent” and chemical analysis for total soluble iron can provide an accurate evaluation of the amount of nonmagnetic iron in any particular ore, especially in mixed magnetite‐hematite ores. Equipment for direct readout of grams magnetite per 100 cc was designed using the differential transformer principle. Calibration is linear below 20 grams magnetite per 100 cc, and measurement of apparent density of sample readily converts the readings to percent magnetite by weight.

Magnetic susceptibility of Tri-Coordinated copper(II) complexes

1957 ◽  
Vol 10 (4) ◽  
pp. 386 ◽  
Author(s):  
M Kishita ◽  
Y Muto ◽  
M Kubo
Keyword(s):  
Magnetic Susceptibility ◽  
Chemical Analysis ◽  
Copper Atom ◽  
Room Temperature ◽  
Copper Complexes ◽  
Magnetic Moments ◽  
The Other ◽  
Acetate Monohydrate ◽  
Magnetic Susceptibilities ◽  
Cupric Acetate

The magnetic susceptibilities of salicylal-o-hydroxybenzylamine Cu(II), salicylal-o-hydroxyanil Cu(II), acetylacetone-mono-(0-hydroxyanil) Cu(II), and benzoylacetone- mono-(0-hydroxyanil) Cu(II), as well as their pyridinates, have been measured by the Gouy method at room temperature. The effective magnetic moments calculated from the . data of the pyridine-free complexes per one copper atom are smaller than the theoretical moment, 1.73 B.M., for one odd electron. Although it has been presumed from the method of synthesis, the chemical analysis of the complexes, and the tridentate nature of the ligand molecules that the copper atoms of the chelates have the unusual coordination number 3, the subnormal magnetic moments suggest the presence of dimeric molecules, in which two copper atoms are very close to each other as in cupric acetate monohydrate. On the other hand, the pyridinates have normal magnetic moments expected for tetra-coordinated copper complexes.

Micro- and Nano-instrument Power

2006 ◽  
Vol 973 ◽  
Author(s):  
Vassili Karanassios
Keyword(s):  
Signal Processing ◽  
Chemical Analysis ◽  
Data Acquisition ◽  
Cancer Diagnosis ◽  
Paradigm Shift ◽  
The Other ◽  
Paradigm Shifts ◽  
Comparable Performance ◽  
Wireless Interface ◽  
Capsule Size

ABSTRACTFor the last several years, we have been developing and characterizing “mobile” micro- and nano-instruments for use on-site (e.g., in the field). Although such portable, battery-operated instruments are much smaller that their laboratory-scale counterparts, sometimes they provide comparable performance and they often offer improved capabilities. As such, they are expected to cause a paradigm shift in classical chemical analysis by allowing practioners to “bring the lab (or part of it) to the sample”. Two classes of examples will be used as the means with which to illustrate the power of micro- and nano-instruments. One class involves a “patient” as the sample and an ingestible capsule-size spectrometer used for cancer diagnosis of the gastro intestinal tack as (part of) “the lab”. The other involves the “environment” as the sample and a portable, battery-operated, miniaturized instrument that utilizes a PalmPilot™ with a wireless interface for data acquisition and signal processing as (part of) “the lab”. To discuss how to electrically power such miniaturized instruments, mobile energy issues will be addressed. Particular emphasis will be paid to current or anticipated future applications and to the paradigm shifts that may prove essential in powering the next generation of miniaturized instruments.

ESTIMATION OF SOURCE PARAMETERS IN IBADAN, SOUTH – WESTERN NIGERIA USING DIGITIZED AEROMAGNETIC DATA

2018 ◽  
Vol 14 (2) ◽  
pp. 15-28
Author(s):  
A A ALABI ◽  
O OLOWOFELA
Keyword(s):  
Magnetic Susceptibility ◽  
Source Parameters ◽  
Granite Gneiss ◽  
Geological Structure ◽  
Magnetic Data ◽  
Susceptibility Map ◽  
Rock Types ◽  
Upward Continuation ◽  
Magnetic Basement ◽  
Local Wavenumber

Airborne magnetic data covering geographical latitudes of 7000‟N to 7030‟N and longitudes of 3 30′E to 4 00′E within Ibadan area were obtained from Nigeria Geology Survey Agency. The data were ana-lyzed to map the sub surface structure and the source parameters were deduced from the quantitative and qualitative interpretation of magnetic data. The upward continuation technique was used to de-emphasize short – wavelength anomaly while the depth to magnetic sources in the area was deter-mined using local wavenumber technique, the analytic signal was also employed to obtain the depths of the magnetic basement. Analysis involving the local wavenumber, upward continuation and appar-ent magnetic susceptibility techniques significantly improves the interpretation of magnetic data in terms of delineating the geological structure, source parameter and magnetic susceptibility within Iba-dan area.. These depth ranges from 0.607km to 2.48km. The apparent susceptibility map at the cut-off wavelength of 50 m ranges from -0.00012 to 0.00079 which agree with the susceptibility value of some rock types; granite gneiss, migmatite biotite gneiss, biotite muscovite granite, hornblende granite, quartz and schists. The result of the local wavenumber suggests variation along the profiles in the surface of magnetic basement across the study area.

V.—Manganese in the Sea

1876 ◽  
Vol 1 (2) ◽  
pp. 50-53 ◽  
Author(s):  
A. H. Church
Keyword(s):  
Chemical Analysis ◽  
Deep Sea ◽  
The Other ◽  
Manganese Nodules ◽  
Red Clay ◽  
Chemical Examination ◽  
Sea Bottom ◽  
Ample Supply

To the geologist, the mineralogist and the chemist, two of the observations made during the voyage of the Challenger are of especial interest. One of these observations is the occurrence over vast areas of the deep sea bottom of a peculiar red clay, containing silica, peroxide of iron, and alumina. The other discovery to which I refer has been described by Sir Wyville Thomson as the occurrence throughout this red clay of nodules of “nearly pure peroxide of manganese.” To these nodules, as well us to the red clay, an organic origin has been assigned. But the immediate source of so much manganese is hard to find, for this element is by no means an abundant constituent of animal or vegetable organisms. The difficulty is, however, somewhat lessened when the manganese nodules are submitted to a more minute chemical examination. From two correspondents I have received an ample supply of these curious concretions, accompanied by a suggestion that they should be submitted to chemical analysis.

Table II : Quantitative determination of carbonyl compounds at different odour sources (concentrations in ppb) Rendering plant Gelatine plant neighbourhood neighbourhood Formaldehyde 40 16 Acetaldehyde 39 24 Acetone 36 73 Prcpanal 10 -Isobutyraldehyde 10 30 Pentanal 15 19 Hexanal 3.52 Heptanal 12.5 Octanal 10.5 Nonanal 1 2 acids (figure 7). However extractions always involve a serious decrease in sensitivity, while evaporation of the extract produces a solution in 0.1-0.5 ml of solvent, and only 1 pi of it can be brought in the gas chromatograph. Therefore work is in progress to enhance sensitivity by converting acids in­ to halogenated derivatives, which can be GC-analysed with the more sensitive electron-capture detector. For thiols a similar procedure is investigated as with aldehydes. One possibility is absorption of thiols in an alkaline solution and reaction with 2,4-dinitrochlorobenzene, yielding 2,4-dinitrofenylsulfides, which are analysed by HPLC (9). Sane improvements on removal of reagents at the one hand and on separation of sane by-products on the other hand have to be achieved in order to in­ crease the sensitivity with another factor of ten. 5. CONCLUSION The actual scope and limitations of chemical analysis of odour show that all problems can be tackled as far as emission is concerned. For iititiission measurements seme progress is necessary, but there is no essential reason why chemical analysis would be unable to attain the desired sensitivity for all types of odorants. There is no doubt that in a few years the last dif­ ficulties will be solved. In order to achieve real control of odour nui­ sance, automatic measurement is necessary on a long time basis. There again seme technical development is to be expected. Does this mean that machines are going to decide if an odour is pre­ sent or not? By no means, while the population will always be the reference, and psychophysical measurements will be necessary to make chemical analysis possible.

1986 ◽  
pp. 171-171
Keyword(s):  
Chemical Analysis ◽  
Quantitative Determination ◽  
Alkaline Solution ◽  
Automatic Measurement ◽  
The Other ◽  
Long Time ◽  
Time Basis ◽  
The One ◽  
By Products

scholarly journals Preparation and Spectral Study of New Complexes of Some Metal Ions with 3,5-Dimethyl-1H-Pyrazol-1-yl Phenyl Methanone

2011 ◽  
Vol 8 (4) ◽  
pp. 1005-1011
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Molar Conductivity ◽  
The Other ◽  
Octahedral Structure ◽  
Tetrahedral Structure ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Many complexes of 3,5-dimethyl-1H-pyrazol-1-yl phenyl methanone with Cr(III), Co(II), Ni(II), Cu(II) and Cd(II) were synthesized and characterized by FT-IR, UV/visible spectra, elemental analysis, room temperature magnetic susceptibility and molar conductivity. Cd(II) complex was expected to have tetrahedral structure while all the other complexes were expected to have an octahedral structure.

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