Mg, Al, Si, Zn, P, S, Cl, K, Ca, Ba, Ti, Cr, Mn, Fe, Ni, Br, Rb, Sr determination in plant materials
The test method specifies determination of Mg, Al, Si, Zn, P, S, Cl, K, Ca, Ba, Ti, Cr, Mn, Fe, Ni, Br, Rb, Sr in specially prepared powder samples of vegetable material by X-ray fluorescence method.
Materials suitable for analysis are listed below corresponding:
– Tea products ;
– Tobacco products;
– Corn products and wastes;
– Kids, dietician, health-protection dry nutrition and wastes;
– Spices, spicy additives, concentrates and wastes;
– Vegetable and animal medical plants raw and products;
– Agricultural and forestry products.
Analysis is run for sample material selected according to corresponding regulations and norms. The test method does not specify sampling procedure.
After sampling the material shall be dried in an air bath, and grinded to the particle size ≤71 micron.
Two concurrebt samples shall be analyzed. The samples are pressed 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 put into the sample holder and then into spectrometer. Analysis is carried out automatically according to the chosen program. The program can determine all elements listed in the test method or some of those elements by choice.
Measurement range
Concentration range specified by the test method is listed in the table. All elements can be determined from the same sample material.
| Element | Measurement units | Concentration range, from – up to |
| Mg | % | 0,25-0,45 |
| Al | % | 0,065-0,10 |
| Si | % | 0,40-1,1 |
| P | % | 0,10-1,0 |
| S | % | 0,10-0,35 |
| Cl | % | 0,10-0,55 |
| K | % | 0,10-3,5 |
| Ca | % | 0,05-2,8 |
| Ba | mg/kg | 65-250 |
| Ti | mg/kg | 100-800 |
| Cr | mg/kg | 5-30 |
| Mn | mg/kg | 10-1500 |
| Fe | mg/kg | 20-2600 |
| Ni | mg/kg | 10-50 |
| Zn | mg/kg | 15-100 |
| Br | mg/kg | 25-55 |
| Rb | mg/kg | 25-100 |
| Sr | mg/kg | 40-1000 |