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PD CEN/TS 17701-1:2022 Plant biostimulants. Determination of specific elements - Digestion by aqua regia for subsequent determination of elements, 2022
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Principle
- 5 Sampling and sample preparation
- 6 Reagents [Go to Page]
- 6.1 Water with a specific conductivity not higher than 0,2 mS/m at 25 °C, free from the elements to be determined.
- 6.2 Hydrochloric acid 37 %, c(HCl) ≈ 12 mol/l, ρ ≈ 1,18 g/ml.
- 6.3 Nitric acid 65 %, c(HNO3) ≈ 14,3 mol/l, ρ ≈ 1,4 g/ml.
- 6.4 Antifoaming agent, e.g. n-dodecane (C12H26) or octanol (C8H18O) are suitable.
- 7 Apparatus [Go to Page]
- 7.1 Common laboratory glassware. All glassware and plastic ware shall be adequately cleaned and stored to avoid any contamination.
- 7.2 Apparatus for thermal heating digestion, temperature controlled with reaction vessel and reflux condenser. The capacity of the reaction vessel should be at least 5 times of the volume of the aqua regia used.
- 7.3 Filter paper, ash free and of recognized and tested quality.
- 7.4 Analytical balance capable of weighing to an accuracy of 1 mg or better.
- 8 Procedure [Go to Page]
- 8.1 Sample digestion
- 8.2 Sample pre-concentration
- 8.3 Blank
- 9 Test report
- Annex A (informative)Adjustment to different digestion procedures and measurement apparatuses [Go to Page]
- A.1 Adjustment of the procedure to different final volumes
- A.2 Calculation of the sample weight [Go to Page]
- A.2.1 General
- A.2.2 Calculation of the weight of the sample (dry matter)
- A.2.3 Calculation of the weight of the sample for analysis
- A.2.4 Example [Go to Page]