V, Cr, Co, Ni, Cu, Zn, As, Sr and Pb, MgO, Al2O3, SiO2, P2O5, K2O, CaO, TiO2, MnO, Fe2O3 determination in soil

The test method specifies determination of metal and metal oxide content (total content) in powder soil samples be XRFA method.
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The  test material shall be cleaned from roots, big stones, glass and so on.
10-50 grams of the cleaned sample material is dried till constant weight at temperature of  105± 2°C.
Dry sample material is grinded with a disk grinder or agate mortar till ≤71 micron particles size.
Analysis includes two measurements of two concurrent samples of the same sample material. The samples may be prepared two following ways.

Filling the sample cup
Sample material is filled in a standard sample cup delivered with spectrometer. The powder is compressed till smooth flat surface at the cup edge level is obtained. The cup is covered with 5 micron thick polyethyleneterephtalate film. The film is fixed with rings included in the sample cup set.

Pressing in a boron acid cup
Boron acid cup is pressed out with a shaped punch being at least 3 mm deep. Sample material is put into the cup and pressed with a flat punch into a pellet.
The sample cup or the pellet is put into the sample holder and then into a spectrometer. Analysis is carried out automatically according to the chosen program. The program can determine all elements (oxides) listed in the test method or some of those elements by choice.
Mass content determination of all metal and metal oxides is obtained from one sample.
ElementUnit of measurementConcentration rage of the component
MgO%From 0.20 up to 3.0
Al2O3%From 3 up to 18
SiO2%From 50 up to 92
P2O5%From 0.035 up to 0.21
K2O%From 0.9 up to 2.6
CaO%From 0.20 up to 12
TiO2%From 0.25 up to 1.6
Vmg/kg
Over 10 up to 180
Crmg/kg
From 80 up to 180
MnOmg/kg
From 100 up to 950
Fe2O3%From 1.0 up to 8.0
Comg/kg
From 10 up to 150
Nimg/kg
From 10 up to 380
Cumg/kg
From 20 up to 310
Znmg/kg
From 10 up to 610
Asmg/kg
From 21 up to 70
Srmg/kg
Over 50 up to 310
Pbmg/kg
From 30 up to 280
Laboratory grinder LDI-65
desk top laboratory grinder. The grinder is used for uniform grinding of sample material. The grinder is recommended for powder sample preparation for XRFA.
It provides required particle size, and uniform grinding. The grinding plates do not introduce additional elements into the sample material, therefore does not add errors to analysis.
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Hydraulic laboratory press PGR - 10
desk top manually operated hydraulic press is recommended for powder sample pressing to improve analysis results.
There are two modifications differ in available stresses – either from 0 to 10 ton or from 0 to 20 ton.
The modification is chosen dependent on the material for analysis and customer analytical task.
The delivery set includes molders of various diameters dependent on the analytical task.
ПГР - 10

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Agate mortar
The mortar is used for manual suspension and powder grinding, as well as for mixing small portions of substances used in scientific research.

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